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, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Current assets:        
Cash and cash equivalents $ 75,293 $ 458,956 $ 214,385 $ 167,088
Accounts receivable—oil and gas 107,455 58,824    
Accounts receivable-related parties 127 2,617    
Accounts receivable - intercompany    0    
Prepaid expenses and other current assets 3,575 2,581    
Deferred tax asset 7,661 6,927    
Short-term derivative instruments    324    
Note receivable - related party 875 875    
Total current assets 194,986 531,104    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 3,201,529 2,477,178    
Other property and equipment 12,605 11,131    
Accumulated depletion, depreciation, amortization and impairment (897,553) (784,717)    
Property and equipment, net 2,316,581 1,703,592    
Other assets:        
Equity investments 501,436 440,068    
Derivative instruments 784 521    
Other assets 17,985 17,851    
Total other assets 520,205 458,440    
Total assets 3,031,772 2,693,136    
Current liabilities:        
Accounts payable and accrued liabilities 287,458 190,707    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 795 795 780  
Short-term derivative instruments 24,532 12,280    
Current maturities of long-term debt 163 159    
Total current liabilities 312,948 203,941    
Long-term derivative instrument 5,487 11,366    
Asset retirement obligation—long-term 15,181 14,288 13,231  
Deferred tax liability 170,559 114,275    
Long-term debt, net of current maturities 339,098 299,028    
Total liabilities 843,273 642,898    
Stockholders’ equity:        
Common stock 854 851    
Paid-in capital 1,821,368 1,813,058    
Accumulated other comprehensive loss (10,243) (9,781)    
Retained earnings (accumulated deficit) 376,520 246,110    
Total stockholders’ equity 2,188,499 2,050,238 1,569,286 1,126,408
Total liabilities and stockholders’ equity 3,031,772 2,693,136    
Parent Company [Member]
        
Current assets:        
Cash and cash equivalents 72,921 451,431 213,390 165,293
Accounts receivable—oil and gas 102,136 58,662    
Accounts receivable-related parties 127 2,617    
Accounts receivable - intercompany 24,774 21,379    
Prepaid expenses and other current assets 3,575 2,581    
Deferred tax asset 7,661 6,927    
Short-term derivative instruments   324    
Note receivable - related party 875 875    
Total current assets 212,069 544,796    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 3,191,073 2,470,411    
Other property and equipment 12,575 11,102    
Accumulated depletion, depreciation, amortization and impairment (897,530) (784,695)    
Property and equipment, net 2,306,118 1,696,818    
Other assets:        
Equity investments 494,342 432,727    
Derivative instruments 784 521    
Other assets 17,985 17,851    
Total other assets 513,111 451,099    
Total assets 3,031,298 2,692,713    
Current liabilities:        
Accounts payable and accrued liabilities 286,984 190,284    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 795 795    
Short-term derivative instruments 24,532 12,280    
Current maturities of long-term debt 163 159    
Total current liabilities 312,474 203,518    
Long-term derivative instrument 5,487 11,366    
Asset retirement obligation—long-term 15,181 14,288    
Deferred tax liability 170,559 114,275    
Long-term debt, net of current maturities 339,098 299,028    
Total liabilities 842,799 642,475    
Stockholders’ equity:        
Common stock 854 851    
Paid-in capital 1,821,368 1,813,058    
Accumulated other comprehensive loss (10,243) (9,781)    
Retained earnings (accumulated deficit) 376,520 246,110    
Total stockholders’ equity 2,188,499 2,050,238    
Total liabilities and stockholders’ equity 3,031,298 2,692,713    
Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 2,371 7,525 995 1,795
Accounts receivable—oil and gas 5,319 162    
Accounts receivable-related parties 0 0    
Accounts receivable - intercompany 27 27    
Prepaid expenses and other current assets    0    
Deferred tax asset 0 0    
Short-term derivative instruments   0    
Note receivable - related party 0 0    
Total current assets 7,717 7,714    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 11,029 7,340    
Other property and equipment 30 29    
Accumulated depletion, depreciation, amortization and impairment (23) (22)    
Property and equipment, net 11,036 7,347    
Other assets:        
Equity investments    0    
Derivative instruments 0 0    
Other assets    0    
Total other assets          
Total assets 18,753 15,061    
Current liabilities:        
Accounts payable and accrued liabilities 474 423    
Accounts payable - intercompany 24,696 21,296    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities 25,170 21,719    
Long-term derivative instrument 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Total liabilities 25,170 21,719    
Stockholders’ equity:        
Common stock    0    
Paid-in capital 322 322    
Accumulated other comprehensive loss    0    
Retained earnings (accumulated deficit) (6,739) (6,980)    
Total stockholders’ equity (6,417) (6,658)    
Total liabilities and stockholders’ equity 18,753 15,061    
Non-Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 1 0 0 0
Accounts receivable—oil and gas 0 0    
Accounts receivable-related parties 0 0    
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 0 0    
Deferred tax asset 0 0    
Short-term derivative instruments   0    
Note receivable - related party 0 0    
Total current assets 1       
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    0    
Other assets:        
Equity investments 203,351 191,473    
Derivative instruments 0 0    
Other assets    0    
Total other assets 203,351 191,473    
Total assets 203,352 191,473    
Current liabilities:        
Accounts payable and accrued liabilities    0    
Accounts payable - intercompany 105 110    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities 105 110    
Long-term derivative instrument 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Total liabilities 105 110    
Stockholders’ equity:        
Common stock    0    
Paid-in capital 224,849 208,277    
Accumulated other comprehensive loss (10,243) (9,781)    
Retained earnings (accumulated deficit) (11,359) (7,133)    
Total stockholders’ equity 203,247 191,363    
Total liabilities and stockholders’ equity 203,352 191,473    
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 (24,801) (21,406)    
Prepaid expenses and other current assets    0    
Deferred tax asset 0 0    
Short-term derivative instruments   0    
Note receivable - related party 0 0    
Total current assets (24,801) (21,406)    
Property and equipment:        
Oil and natural gas properties, full-cost accounting (573) (573)    
Other property and equipment    0    
Accumulated depletion, depreciation, amortization and impairment    0    
Property and equipment, net (573) (573)    
Other assets:        
Equity investments (196,257) (184,132)    
Derivative instruments 0 0    
Other assets    0    
Total other assets (196,257) (184,132)    
Total assets (221,631) (206,111)    
Current liabilities:        
Accounts payable and accrued liabilities    0    
Accounts payable - intercompany (24,801) (21,406)    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities (24,801) (21,406)    
Long-term derivative instrument 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability    0    
Long-term debt, net of current maturities 0 0    
Total liabilities (24,801) (21,406)    
Stockholders’ equity:        
Common stock    0    
Paid-in capital (225,171) (208,599)    
Accumulated other comprehensive loss 10,243 9,781    
Retained earnings (accumulated deficit) 18,098 14,113    
Total stockholders’ equity (196,830) (184,705)    
Total liabilities and stockholders’ equity $ (221,631) $ (206,111)