Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details)

v2.4.0.8
Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 214,385 $ 167,088 $ 6,613 $ 93,897
Accounts receivable—oil and gas 30,798 25,615    
Accounts receivable-related parties 36,823 34,848    
Accounts receivable - intercompany          
Prepaid expenses and other current assets 2,639 1,506    
Deferred tax asset 372 0    
Short-term derivative instruments 863 664    
Total current assets 285,880 229,721    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 2,065,918 1,611,090    
Other property and equipment 9,017 8,662    
Accumulated depletion, depreciation, amortization and impairment (717,007) (665,884)    
Property and equipment, net 1,357,928 953,868    
Other assets:        
Equity investments 438,864 381,484    
Other assets 13,153 13,295    
Total other assets 452,017 394,779    
Deferred tax asset   0    
Total assets 2,095,825 1,578,368    
Current liabilities:        
Accounts payable and accrued liabilities 142,375 110,244    
Accounts payable - intercompany 0       
Asset retirement obligation—current 780 60 60  
Short-term derivative instruments 1,839 10,442    
Current maturities of long-term debt 154 150    
Total current liabilities 145,148 120,896    
Asset retirement obligation—long-term 13,231 13,215 13,120  
Deferred tax liability 69,204 18,607    
Long-term debt, net of current maturities 298,956 298,888    
Other non-current liabilities 0 354    
Total liabilities 526,539 451,960    
Stockholders’ equity:        
Common stock 775 674    
Paid-in capital 1,398,188 1,036,245    
Accumulated other comprehensive income (loss) (10,982) (3,429)    
Retained earnings (accumulated deficit) 181,305 92,918    
Total stockholders’ equity 1,569,286 1,126,408 692,714 632,350
Total liabilities and stockholders’ equity 2,095,825 1,578,368    
Parent [Member]
        
Current assets:        
Cash and cash equivalents 213,390 165,293 6,261 93,124
Accounts receivable—oil and gas 30,288 25,070    
Accounts receivable-related parties 35,432 33,806    
Accounts receivable - intercompany 15,254 15,368    
Prepaid expenses and other current assets 2,639 1,506    
Deferred tax asset 372      
Short-term derivative instruments 863 664    
Total current assets 298,238 241,707    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 2,060,274 1,606,172    
Other property and equipment 8,988 8,642    
Accumulated depletion, depreciation, amortization and impairment (716,986) (665,864)    
Property and equipment, net 1,352,276 948,950    
Other assets:        
Equity investments 431,865 374,209    
Other assets 13,153 13,295    
Total other assets 445,018 387,504    
Deferred tax asset   0    
Total assets 2,095,532 1,578,161    
Current liabilities:        
Accounts payable and accrued liabilities 142,082 110,037    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 780 60    
Short-term derivative instruments 1,839 10,442    
Current maturities of long-term debt 154 150    
Total current liabilities 144,855 120,689    
Asset retirement obligation—long-term 13,231 13,215    
Deferred tax liability 69,204 18,607    
Long-term debt, net of current maturities 298,956 298,888    
Other non-current liabilities   354    
Total liabilities 526,246 451,753    
Stockholders’ equity:        
Common stock 775 674    
Paid-in capital 1,398,188 1,036,245    
Accumulated other comprehensive income (loss) (10,982) (3,429)    
Retained earnings (accumulated deficit) 181,305 92,918    
Total stockholders’ equity 1,569,286 1,126,408    
Total liabilities and stockholders’ equity 2,095,532 1,578,161    
Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 995 1,795 351 772
Accounts receivable—oil and gas 510 545    
Accounts receivable-related parties 1,391 1,042    
Accounts receivable - intercompany          
Prepaid expenses and other current assets    0    
Deferred tax asset 0      
Short-term derivative instruments    0    
Total current assets 2,896 3,382    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 5,644 4,918    
Other property and equipment 29 20    
Accumulated depletion, depreciation, amortization and impairment (21) (20)    
Property and equipment, net 5,652 4,918    
Other assets:        
Equity investments          
Other assets          
Total other assets          
Deferred tax asset   0    
Total assets 8,548 8,300    
Current liabilities:        
Accounts payable and accrued liabilities 293 207    
Accounts payable - intercompany 15,144 15,259    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities 15,437 15,466    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Other non-current liabilities   0    
Total liabilities 15,437 15,466    
Stockholders’ equity:        
Common stock          
Paid-in capital 322 322    
Accumulated other comprehensive income (loss)          
Retained earnings (accumulated deficit) (7,211) (7,488)    
Total stockholders’ equity (6,889) (7,166)    
Total liabilities and stockholders’ equity 8,548 8,300    
Non-Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 0 0 1 1
Accounts receivable—oil and gas 0 0    
Accounts receivable-related parties 0 0    
Accounts receivable - intercompany 0       
Prepaid expenses and other current assets 0 0    
Deferred tax asset 0      
Short-term derivative instruments 0 0    
Total current assets          
Property and equipment:        
Oil and natural gas properties, full-cost accounting    0    
Other property and equipment    0    
Accumulated depletion, depreciation, amortization and impairment    0    
Property and equipment, net          
Other assets:        
Equity investments 176,877 172,766    
Other assets          
Total other assets 176,877 172,766    
Deferred tax asset   0    
Total assets 176,877 172,766    
Current liabilities:        
Accounts payable and accrued liabilities          
Accounts payable - intercompany 110 109    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities 110 109    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Other non-current liabilities   0    
Total liabilities 110 109    
Stockholders’ equity:        
Common stock          
Paid-in capital 189,403 174,348    
Accumulated other comprehensive income (loss) (7,238) 2,442    
Retained earnings (accumulated deficit) (5,398) (4,133)    
Total stockholders’ equity 176,767 172,657    
Total liabilities and stockholders’ equity 176,877 172,766    
Eliminations [Member]
        
Current assets:        
Cash and cash equivalents 0 0 0 0
Accounts receivable—oil and gas    0    
Accounts receivable-related parties 0 0    
Accounts receivable - intercompany (15,254) (15,368)    
Prepaid expenses and other current assets    0    
Deferred tax asset 0      
Short-term derivative instruments    0    
Total current assets (15,254) (15,368)    
Property and equipment:        
Oil and natural gas properties, full-cost accounting    0    
Other property and equipment    0    
Accumulated depletion, depreciation, amortization and impairment    0    
Property and equipment, net          
Other assets:        
Equity investments (169,878) (165,491)    
Other assets          
Total other assets (169,878) (165,491)    
Deferred tax asset   0    
Total assets (185,132) (180,859)    
Current liabilities:        
Accounts payable and accrued liabilities          
Accounts payable - intercompany (15,254) (15,368)    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities (15,254) (15,368)    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Other non-current liabilities   0    
Total liabilities (15,254) (15,368)    
Stockholders’ equity:        
Common stock          
Paid-in capital (189,725) (174,670)    
Accumulated other comprehensive income (loss) 7,238 (2,442)    
Retained earnings (accumulated deficit) 12,609 11,621    
Total stockholders’ equity (169,878) (165,491)    
Total liabilities and stockholders’ equity $ (185,132) $ (180,859)