| 
           Condensed Consolidating Financial Information (Tables)
  
         | 
        12 Months Ended | 
      
| 
           Dec. 31, 2013 
         | 
      
| Condensed Financial Information of Parent Company Only Disclosure [Abstract] | 
         
 | 
      
| Condensed Consolidating Balance Sheets | 
        
CONDENSED CONSOLIDATING BALANCE SHEETS 
(Amounts in thousands)
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
December 31, 2013  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
Assets  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Current assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents  | 
$  | 
451,431  | 
 
  | 
   | 
$  | 
7,525  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
458,956  | 
 
  | 
 
Accounts receivable - oil and gas  | 
58,662  | 
 
  | 
   | 
162  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
58,824  | 
 
  | 
 
Accounts receivable - related parties  | 
2,617  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,617  | 
 
  | 
 
Accounts receivable - intercompany  | 
21,379  | 
 
  | 
   | 
27  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(21,406  | 
)  | 
   | 
—  | 
 
  | 
 
Prepaid expenses and other current assets  | 
2,581  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,581  | 
 
  | 
 
Deferred tax asset  | 
6,927  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
6,927  | 
 
  | 
 
Short-term derivative instruments  | 
324  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
324  | 
 
  | 
 
Note receivable - related party  | 
875  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
875  | 
 
  | 
 
Total current assets  | 
544,796  | 
 
  | 
   | 
7,714  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(21,406  | 
)  | 
   | 
531,104  | 
 
  | 
 
Property and equipment:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Oil and natural gas properties, full-cost accounting  | 
2,470,411  | 
 
  | 
   | 
7,340  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(573  | 
)  | 
   | 
2,477,178  | 
 
  | 
 
Other property and equipment  | 
11,102  | 
 
  | 
   | 
29  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
11,131  | 
 
  | 
 
Accumulated depletion, depreciation, amortization and impairment  | 
(784,695  | 
)  | 
   | 
(22  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(784,717  | 
)  | 
 
Property and equipment, net  | 
1,696,818  | 
 
  | 
   | 
7,347  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(573  | 
)  | 
   | 
1,703,592  | 
 
  | 
 
Other assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Equity investments and investments in subsidiaries  | 
432,727  | 
 
  | 
   | 
—  | 
 
  | 
   | 
191,473  | 
 
  | 
   | 
(184,132  | 
)  | 
   | 
440,068  | 
 
  | 
 
Derivative instruments  | 
521  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
521  | 
 
  | 
 
Other assets  | 
17,851  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
17,851  | 
 
  | 
 
Total other assets  | 
451,099  | 
 
  | 
   | 
—  | 
 
  | 
   | 
191,473  | 
 
  | 
   | 
(184,132  | 
)  | 
   | 
458,440  | 
 
  | 
 
  Total assets  | 
$  | 
2,692,713  | 
 
  | 
   | 
$  | 
15,061  | 
 
  | 
   | 
$  | 
191,473  | 
 
  | 
   | 
$  | 
(206,111  | 
)  | 
   | 
$  | 
2,693,136  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Liabilities and Stockholders' Equity  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Current liabilities:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Accounts payable and accrued liabilities  | 
$  | 
190,284  | 
 
  | 
   | 
$  | 
423  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
190,707  | 
 
  | 
 
Accounts payable - intercompany  | 
—  | 
 
  | 
   | 
21,296  | 
 
  | 
   | 
110  | 
 
  | 
   | 
(21,406  | 
)  | 
   | 
—  | 
 
  | 
 
Asset retirement obligation - current  | 
795  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
795  | 
 
  | 
 
Short-term derivative instruments  | 
12,280  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
12,280  | 
 
  | 
 
Current maturities of long-term debt  | 
159  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
159  | 
 
  | 
 
Total current liabilities  | 
203,518  | 
 
  | 
   | 
21,719  | 
 
  | 
   | 
110  | 
 
  | 
   | 
(21,406  | 
)  | 
   | 
203,941  | 
 
  | 
 
Long-term derivative instrument  | 
11,366  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
11,366  | 
 
  | 
 
Asset retirement obligation - long-term  | 
14,288  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
14,288  | 
 
  | 
 
Deferred tax liability  | 
114,275  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
114,275  | 
 
  | 
 
Long-term debt, net of current maturities  | 
299,028  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
299,028  | 
 
  | 
 
Total liabilities  | 
642,475  | 
 
  | 
   | 
21,719  | 
 
  | 
   | 
110  | 
 
  | 
   | 
(21,406  | 
)  | 
   | 
642,898  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Stockholders' equity:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Common stock  | 
851  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
851  | 
 
  | 
 
Paid-in capital  | 
1,813,058  | 
 
  | 
   | 
322  | 
 
  | 
   | 
208,277  | 
 
  | 
   | 
(208,599  | 
)  | 
   | 
1,813,058  | 
 
  | 
 
Accumulated other comprehensive income (loss)  | 
(9,781  | 
)  | 
   | 
—  | 
 
  | 
   | 
(9,781  | 
)  | 
   | 
9,781  | 
 
  | 
   | 
(9,781  | 
)  | 
 
Retained earnings (accumulated deficit)  | 
246,110  | 
 
  | 
   | 
(6,980  | 
)  | 
   | 
(7,133  | 
)  | 
   | 
14,113  | 
 
  | 
   | 
246,110  | 
 
  | 
 
Total stockholders' equity  | 
2,050,238  | 
 
  | 
   | 
(6,658  | 
)  | 
   | 
191,363  | 
 
  | 
   | 
(184,705  | 
)  | 
   | 
2,050,238  | 
 
  | 
 
  Total liabilities and stockholders' equity  | 
$  | 
2,692,713  | 
 
  | 
   | 
$  | 
15,061  | 
 
  | 
   | 
$  | 
191,473  | 
 
  | 
   | 
$  | 
(206,111  | 
)  | 
   | 
$  | 
2,693,136  | 
 
  | 
 
  
 
 
CONDENSED CONSOLIDATING BALANCE SHEETS 
(Amounts in thousands)
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
December 31, 2012  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
Assets  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Current assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents  | 
$  | 
165,293  | 
 
  | 
   | 
$  | 
1,795  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
167,088  | 
 
  | 
 
Accounts receivable - oil and gas  | 
25,070  | 
 
  | 
   | 
545  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
25,615  | 
 
  | 
 
Accounts receivable - related parties  | 
33,806  | 
 
  | 
   | 
1,042  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
34,848  | 
 
  | 
 
Accounts receivable - intercompany  | 
15,368  | 
 
  | 
   | 
   | 
   | 
   | 
   | 
(15,368  | 
)  | 
   | 
—  | 
 
  | 
 
Prepaid expenses and other current assets  | 
1,506  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,506  | 
 
  | 
 
Short-term derivative instruments  | 
664  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
664  | 
 
  | 
 
Total current assets  | 
241,707  | 
 
  | 
   | 
3,382  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(15,368  | 
)  | 
   | 
229,721  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Property and equipment:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Oil and natural gas properties, full-cost accounting,  | 
1,606,172  | 
 
  | 
   | 
4,918  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,611,090  | 
 
  | 
 
Other property and equipment  | 
8,642  | 
 
  | 
   | 
20  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
8,662  | 
 
  | 
 
Accumulated depletion, depreciation, amortization and impairment  | 
(665,864  | 
)  | 
   | 
(20  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(665,884  | 
)  | 
 
Property and equipment, net  | 
948,950  | 
 
  | 
   | 
4,918  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
953,868  | 
 
  | 
 
Other assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Equity investments and investments in subsidiaries  | 
374,209  | 
 
  | 
   | 
—  | 
 
  | 
   | 
172,766  | 
 
  | 
   | 
(165,491  | 
)  | 
   | 
381,484  | 
 
  | 
 
Other assets  | 
13,295  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
13,295  | 
 
  | 
 
Total other assets  | 
387,504  | 
 
  | 
   | 
—  | 
 
  | 
   | 
172,766  | 
 
  | 
   | 
(165,491  | 
)  | 
   | 
394,779  | 
 
  | 
 
  Total assets  | 
$  | 
1,578,161  | 
 
  | 
   | 
$  | 
8,300  | 
 
  | 
   | 
$  | 
172,766  | 
 
  | 
   | 
$  | 
(180,859  | 
)  | 
   | 
$  | 
1,578,368  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Liabilities and Stockholders' Equity  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Current liabilities:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Accounts payable and accrued liabilities  | 
$  | 
110,037  | 
 
  | 
   | 
$  | 
207  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
110,244  | 
 
  | 
 
Accounts payable - intercompany  | 
—  | 
 
  | 
   | 
15,259  | 
 
  | 
   | 
109  | 
 
  | 
   | 
(15,368  | 
)  | 
   | 
—  | 
 
  | 
 
Asset retirement obligation - current  | 
60  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
60  | 
 
  | 
 
Short-term derivative instruments  | 
10,442  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
10,442  | 
 
  | 
 
Current maturities of long-term debt  | 
150  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
150  | 
 
  | 
 
Total current liabilities  | 
120,689  | 
 
  | 
   | 
15,466  | 
 
  | 
   | 
109  | 
 
  | 
   | 
(15,368  | 
)  | 
   | 
120,896  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Asset retirement obligation - long-term  | 
13,215  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
13,215  | 
 
  | 
 
Deferred tax liability  | 
18,607  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
18,607  | 
 
  | 
 
Long-term debt, net of current maturities  | 
298,888  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
298,888  | 
 
  | 
 
Other non-current liabilities  | 
354  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
354  | 
 
  | 
 
Total liabilities  | 
451,753  | 
 
  | 
   | 
15,466  | 
 
  | 
   | 
109  | 
 
  | 
   | 
(15,368  | 
)  | 
   | 
451,960  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Stockholders' equity:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Common stock  | 
674  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
674  | 
 
  | 
 
Paid-in capital  | 
1,036,245  | 
 
  | 
   | 
322  | 
 
  | 
   | 
174,348  | 
 
  | 
   | 
(174,670  | 
)  | 
   | 
1,036,245  | 
 
  | 
 
Accumulated other comprehensive income (loss)  | 
(3,429  | 
)  | 
   | 
—  | 
 
  | 
   | 
2,442  | 
 
  | 
   | 
(2,442  | 
)  | 
   | 
(3,429  | 
)  | 
 
Retained earnings (accumulated deficit)  | 
92,918  | 
 
  | 
   | 
(7,488  | 
)  | 
   | 
(4,133  | 
)  | 
   | 
11,621  | 
 
  | 
   | 
92,918  | 
 
  | 
 
Total stockholders' equity  | 
1,126,408  | 
 
  | 
   | 
(7,166  | 
)  | 
   | 
172,657  | 
 
  | 
   | 
(165,491  | 
)  | 
   | 
1,126,408  | 
 
  | 
 
  Total liabilities and stockholders' equity  | 
$  | 
1,578,161  | 
 
  | 
   | 
$  | 
8,300  | 
 
  | 
   | 
$  | 
172,766  | 
 
  | 
   | 
$  | 
(180,859  | 
)  | 
   | 
$  | 
1,578,368  | 
 
  | 
 
  
 
 
 | 
      
| Condensed Consolidating Statements of Operations | 
        
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS 
(Amounts in thousands) 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
 Year Ended December 31, 2013  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Total revenues  | 
$  | 
261,809  | 
 
  | 
   | 
$  | 
1,517  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
(573  | 
)  | 
   | 
$  | 
262,753  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Costs and expenses:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Lease operating expenses  | 
25,971  | 
 
  | 
   | 
732  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
26,703  | 
 
  | 
 
Production taxes  | 
26,848  | 
 
  | 
   | 
85  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
26,933  | 
 
  | 
 
Midstream transportation, processing and marketing  | 
10,999  | 
 
  | 
   | 
31  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
11,030  | 
 
  | 
 
Depreciation, depletion, and amortization  | 
118,878  | 
 
  | 
   | 
2  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
118,880  | 
 
  | 
 
General and administrative  | 
22,359  | 
 
  | 
   | 
159  | 
 
  | 
   | 
1  | 
 
  | 
   | 
—  | 
 
  | 
   | 
22,519  | 
 
  | 
 
Accretion expense  | 
717  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
717  | 
 
  | 
 
Loss on sale of assets  | 
508  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
508  | 
 
  | 
 
   | 
206,280  | 
 
  | 
   | 
1,009  | 
 
  | 
   | 
1  | 
 
  | 
   | 
—  | 
 
  | 
   | 
207,290  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) FROM OPERATIONS  | 
55,529  | 
 
  | 
   | 
508  | 
 
  | 
   | 
(1  | 
)  | 
   | 
(573  | 
)  | 
   | 
55,463  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
OTHER (INCOME) EXPENSE:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Interest expense  | 
17,490  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
17,490  | 
 
  | 
 
Interest income  | 
(297  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(297  | 
)  | 
 
(Income) loss from equity method investments and investments in subsidiaries  | 
(212,992  | 
)  | 
   | 
—  | 
 
  | 
   | 
2,999  | 
 
  | 
   | 
(3,065  | 
)  | 
   | 
(213,058  | 
)  | 
 
   | 
(195,799  | 
)  | 
   | 
—  | 
 
  | 
   | 
2,999  | 
 
  | 
   | 
(3,065  | 
)  | 
   | 
(195,865  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) BEFORE INCOME TAXES  | 
251,328  | 
 
  | 
   | 
508  | 
 
  | 
   | 
(3,000  | 
)  | 
   | 
2,492  | 
 
  | 
   | 
251,328  | 
 
  | 
 
INCOME TAX EXPENSE  | 
98,136  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
98,136  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
NET INCOME (LOSS)  | 
$  | 
153,192  | 
 
  | 
   | 
$  | 
508  | 
 
  | 
   | 
$  | 
(3,000  | 
)  | 
   | 
$  | 
2,492  | 
 
  | 
   | 
$  | 
153,192  | 
 
  | 
 
  
 
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS 
(Amounts in thousands) 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
 Year Ended December 31, 2012  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Total revenues  | 
$  | 
247,637  | 
 
  | 
   | 
$  | 
1,289  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
248,926  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Costs and expenses:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Lease operating expenses  | 
23,644  | 
 
  | 
   | 
664  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
24,308  | 
 
  | 
 
Production taxes  | 
28,874  | 
 
  | 
   | 
83  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
28,957  | 
 
  | 
 
Midstream transportation, processing and marketing  | 
432  | 
 
  | 
   | 
11  | 
 
  | 
   | 
   | 
   | 
   | 
   | 
443  | 
 
  | 
 
Depreciation, depletion, and amortization  | 
90,749  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
90,749  | 
 
  | 
 
General and administrative  | 
13,602  | 
 
  | 
   | 
132  | 
 
  | 
   | 
74  | 
 
  | 
   | 
—  | 
 
  | 
   | 
13,808  | 
 
  | 
 
Accretion expense  | 
698  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
698  | 
 
  | 
 
Gain on sale of assets  | 
(7,300  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(7,300  | 
)  | 
 
   | 
150,699  | 
 
  | 
   | 
890  | 
 
  | 
   | 
74  | 
 
  | 
   | 
—  | 
 
  | 
   | 
151,663  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) FROM OPERATIONS  | 
96,938  | 
 
  | 
   | 
399  | 
 
  | 
   | 
(74  | 
)  | 
   | 
—  | 
 
  | 
   | 
97,263  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
OTHER (INCOME) EXPENSE:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Interest expense  | 
7,458  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
7,458  | 
 
  | 
 
Interest income  | 
(72  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(72  | 
)  | 
 
(Income) loss from equity method investments and investments in subsidiaries  | 
(5,182  | 
)  | 
   | 
—  | 
 
  | 
   | 
1,512  | 
 
  | 
   | 
(4,652  | 
)  | 
   | 
(8,322  | 
)  | 
 
   | 
2,204  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,512  | 
 
  | 
   | 
(4,652  | 
)  | 
   | 
(936  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) FROM COTINUING OPERATIONS BEFORE INCOME TAXES  | 
94,734  | 
 
  | 
   | 
399  | 
 
  | 
   | 
(1,586  | 
)  | 
   | 
4,652  | 
 
  | 
   | 
98,199  | 
 
  | 
 
INCOME TAX EXPENSE  | 
26,363  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
26,363  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) FROM CONTINUING OPERATIONS  | 
68,371  | 
 
  | 
   | 
399  | 
 
  | 
   | 
(1,586  | 
)  | 
   | 
4,652  | 
 
  | 
   | 
71,836  | 
 
  | 
 
DISCONTINUED OPERATIONS  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Loss on disposal of Belize properties, net of tax  | 
—  | 
 
  | 
   | 
3,465  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
3,465  | 
 
  | 
 
NET INCOME (LOSS)  | 
$  | 
68,371  | 
 
  | 
   | 
$  | 
(3,066  | 
)  | 
   | 
$  | 
(1,586  | 
)  | 
   | 
$  | 
4,652  | 
 
  | 
   | 
$  | 
68,371  | 
 
  | 
 
  
 
CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS 
(Amounts in thousands) 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
 Year Ended December 31, 2011  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Total revenues  | 
$  | 
228,281  | 
 
  | 
   | 
$  | 
973  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
229,254  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Costs and expenses:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Lease operating expenses  | 
20,168  | 
 
  | 
   | 
729  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
20,897  | 
 
  | 
 
Production taxes  | 
25,991  | 
 
  | 
   | 
63  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
26,054  | 
 
  | 
 
Midstream transportation, processing and marketing  | 
275  | 
 
  | 
   | 
4  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
279  | 
 
  | 
 
Depreciation, depletion, and amortization  | 
62,320  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
62,320  | 
 
  | 
 
General and administrative  | 
8,038  | 
 
  | 
   | 
11  | 
 
  | 
   | 
25  | 
 
  | 
   | 
—  | 
 
  | 
   | 
8,074  | 
 
  | 
 
Accretion expense  | 
666  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
666  | 
 
  | 
 
   | 
117,458  | 
 
  | 
   | 
807  | 
 
  | 
   | 
25  | 
 
  | 
   | 
—  | 
 
  | 
   | 
118,290  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) FROM OPERATIONS  | 
110,823  | 
 
  | 
   | 
166  | 
 
  | 
   | 
(25  | 
)  | 
   | 
—  | 
 
  | 
   | 
110,964  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
OTHER (INCOME) EXPENSE:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Interest expense  | 
1,400  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,400  | 
 
  | 
 
Interest income  | 
(39  | 
)  | 
   | 
—  | 
 
  | 
   | 
(147  | 
)  | 
   | 
—  | 
 
  | 
   | 
(186  | 
)  | 
 
(Income) loss from equity method investments and investments in subsidiaries  | 
1,130  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,592  | 
 
  | 
   | 
(1,304  | 
)  | 
   | 
1,418  | 
 
  | 
 
   | 
2,491  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,445  | 
 
  | 
   | 
(1,304  | 
)  | 
   | 
2,632  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
INCOME (LOSS) BEFORE INCOME TAXES  | 
108,332  | 
 
  | 
   | 
166  | 
 
  | 
   | 
(1,470  | 
)  | 
   | 
1,304  | 
 
  | 
   | 
108,332  | 
 
  | 
 
INCOME TAX BENEFIT  | 
(90  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(90  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
NET INCOME (LOSS)  | 
$  | 
108,422  | 
 
  | 
   | 
$  | 
166  | 
 
  | 
   | 
$  | 
(1,470  | 
)  | 
   | 
$  | 
1,304  | 
 
  | 
   | 
$  | 
108,422  | 
 
  | 
 
  
 
 | 
      
| Condensed Consolidating Statements of Comprehensive Income (Loss) | 
        
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Year Ended December 31, 2013  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net income (loss)  | 
$  | 
153,192  | 
 
  | 
   | 
$  | 
508  | 
 
  | 
   | 
$  | 
(3,000  | 
)  | 
   | 
$  | 
2,492  | 
 
  | 
   | 
$  | 
153,192  | 
 
  | 
 
Foreign currency translation adjustment  | 
(12,223  | 
)  | 
   | 
—  | 
 
  | 
   | 
(12,223  | 
)  | 
   | 
12,223  | 
 
  | 
   | 
(12,223  | 
)  | 
 
Change in fair value of derivative instruments, net of taxes  | 
(4,419  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(4,419  | 
)  | 
 
Reclassification of settled contracts, net of taxes  | 
10,290  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
10,290  | 
 
  | 
 
Other comprehensive income (loss)  | 
(6,352  | 
)  | 
   | 
—  | 
 
  | 
   | 
(12,223  | 
)  | 
   | 
12,223  | 
 
  | 
   | 
(6,352  | 
)  | 
 
Comprehensive income  | 
$  | 
146,840  | 
 
  | 
   | 
$  | 
508  | 
 
  | 
   | 
$  | 
(15,223  | 
)  | 
   | 
$  | 
14,715  | 
 
  | 
   | 
$  | 
146,840  | 
 
  | 
 
  
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Year Ended December 31, 2012  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
 
Net income (loss)  | 
$  | 
68,371  | 
 
  | 
   | 
$  | 
(3,066  | 
)  | 
   | 
$  | 
(1,586  | 
)  | 
   | 
$  | 
4,652  | 
 
  | 
   | 
$  | 
68,371  | 
 
  | 
 
Foreign currency translation adjustment  | 
1,355  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,355  | 
 
  | 
   | 
(1,355  | 
)  | 
   | 
1,355  | 
 
  | 
 
Change in fair value of derivative instruments, net of taxes  | 
(8,452  | 
)  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(8,452  | 
)  | 
 
Reclassification of settled contracts, net of taxes  | 
1,005  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,005  | 
 
  | 
 
Other comprehensive income (loss)  | 
(6,092  | 
)  | 
   | 
—  | 
 
  | 
   | 
1,355  | 
 
  | 
   | 
(1,355  | 
)  | 
   | 
(6,092  | 
)  | 
 
Comprehensive income  | 
$  | 
62,279  | 
 
  | 
   | 
$  | 
(3,066  | 
)  | 
   | 
$  | 
(231  | 
)  | 
   | 
$  | 
3,297  | 
 
  | 
   | 
$  | 
62,279  | 
 
  | 
 
  
 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Year Ended December 31, 2011  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
 
Net income (loss)  | 
$  | 
108,422  | 
 
  | 
   | 
$  | 
166  | 
 
  | 
   | 
$  | 
(1,470  | 
)  | 
   | 
$  | 
1,304  | 
 
  | 
   | 
$  | 
108,422  | 
 
  | 
 
Foreign currency translation adjustment  | 
(1,865  | 
)  | 
   | 
—  | 
 
  | 
   | 
(1,865  | 
)  | 
   | 
1,865  | 
 
  | 
   | 
(1,865  | 
)  | 
 
Change in fair value of derivative instruments, net of taxes  | 
1,576  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,576  | 
 
  | 
 
Reclassification of settled contracts, net of taxes  | 
4,720  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
4,720  | 
 
  | 
 
Other comprehensive income (loss)  | 
4,431  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(1,865  | 
)  | 
   | 
1,865  | 
 
  | 
   | 
4,431  | 
 
  | 
 
Comprehensive income  | 
$  | 
112,853  | 
 
  | 
   | 
$  | 
166  | 
 
  | 
   | 
$  | 
(3,335  | 
)  | 
   | 
$  | 
3,169  | 
 
  | 
   | 
$  | 
112,853  | 
 
  | 
 
  
 | 
      
| Condensed Consolidating Statements of Cash Flows | 
        
 |  
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   | 
Year Ended December 31, 2013  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by operating activities  | 
$  | 
182,961  | 
 
  | 
   | 
$  | 
8,104  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
191,065  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) investing activities  | 
(661,886  | 
)  | 
   | 
(2,374  | 
)  | 
   | 
(33,929  | 
)  | 
   | 
33,929  | 
 
  | 
   | 
(664,260  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) financing activities  | 
765,063  | 
 
  | 
   | 
—  | 
 
  | 
   | 
33,929  | 
 
  | 
   | 
(33,929  | 
)  | 
   | 
765,063  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net increase in cash and cash equivalents  | 
286,138  | 
 
  | 
   | 
5,730  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
291,868  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at beginning of period  | 
165,293  | 
 
  | 
   | 
1,795  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
167,088  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at end of period  | 
$  | 
451,431  | 
 
  | 
   | 
$  | 
7,525  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
458,956  | 
 
  | 
 
  
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Year Ended December 31, 2012  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) operating activities  | 
$  | 
195,734  | 
 
  | 
   | 
$  | 
3,425  | 
 
  | 
   | 
$  | 
(1  | 
)  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
199,158  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) investing activities  | 
(838,177  | 
)  | 
   | 
(2,402  | 
)  | 
   | 
(103,915  | 
)  | 
   | 
103,915  | 
 
  | 
   | 
(840,579  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) financing activities  | 
714,612  | 
 
  | 
   | 
—  | 
 
  | 
   | 
103,915  | 
 
  | 
   | 
(103,915  | 
)  | 
   | 
714,612  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net increase (decrease) in cash and cash equivalents  | 
72,169  | 
 
  | 
   | 
1,023  | 
 
  | 
   | 
(1  | 
)  | 
   | 
—  | 
 
  | 
   | 
73,191  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at beginning of period  | 
93,124  | 
 
  | 
   | 
772  | 
 
  | 
   | 
1  | 
 
  | 
   | 
—  | 
 
  | 
   | 
93,897  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at end of period  | 
$  | 
165,293  | 
 
  | 
   | 
$  | 
1,795  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
167,088  | 
 
  | 
 
  
 
 |  
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   | 
Year Ended December 31, 2011  | 
 
   | 
Parent  | 
   | 
Guarantors  | 
   | 
Non-Guarantor  | 
   | 
Eliminations  | 
   | 
Consolidated  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by operating activities  | 
$  | 
154,329  | 
 
  | 
   | 
$  | 
3,808  | 
 
  | 
   | 
$  | 
1  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
158,138  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) investing activities  | 
(320,203  | 
)  | 
   | 
(3,045  | 
)  | 
   | 
(25,858  | 
)  | 
   | 
25,858  | 
 
  | 
   | 
(323,248  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net cash provided by (used in) financing activities  | 
256,539  | 
 
  | 
   | 
—  | 
 
  | 
   | 
25,858  | 
 
  | 
   | 
(25,858  | 
)  | 
   | 
256,539  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Net increase in cash and cash equivalents  | 
90,665  | 
 
  | 
   | 
763  | 
 
  | 
   | 
1  | 
 
  | 
   | 
—  | 
 
  | 
   | 
91,429  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at beginning of period  | 
2,459  | 
 
  | 
   | 
9  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,468  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and cash equivalents at end of period  | 
$  | 
93,124  | 
 
  | 
   | 
$  | 
772  | 
 
  | 
   | 
$  | 
1  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
93,897  | 
 
  | 
 
  
 |