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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Current assets:        
Cash and cash equivalents $ 170,382 $ 458,956 $ 225,980 $ 167,088
Accounts receivable—oil and gas 86,768 58,824    
Accounts receivable-related parties 570 2,617    
Accounts receivable - intercompany    0    
Prepaid expenses and other current assets 3,352 2,581    
Deferred tax asset 7,558 6,927    
Short-term derivative instruments    324    
Note receivable - related party 875 875    
Total current assets 269,505 531,104    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 2,906,976 2,477,178    
Other property and equipment 12,224 11,131    
Accumulated depletion, depreciation, amortization and impairment (841,561) (784,717)    
Property and equipment, net 2,077,639 1,703,592    
Other assets:        
Equity investments 499,419 440,068    
Derivative instruments 2,565 521    
Other assets 17,581 17,851    
Total other assets 519,565 458,440    
Total assets 2,866,709 2,693,136    
Current liabilities:        
Accounts payable and accrued liabilities 239,099 190,707    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 795 795 780  
Short-term derivative instruments 29,755 12,280    
Current maturities of long-term debt 161 159    
Total current liabilities 269,810 203,941    
Long-term derivative instrument 4,277 11,366    
Asset retirement obligation—long-term 14,650 14,288 12,560  
Deferred tax liability 148,470 114,275    
Long-term debt, net of current maturities 299,062 299,028    
Total liabilities 736,269 642,898    
Stockholders’ equity:        
Common stock 853 851    
Paid-in capital 1,817,978 1,813,058    
Accumulated other comprehensive loss (17,059) (9,781)    
Retained earnings (accumulated deficit) 328,668 246,110    
Total stockholders’ equity 2,130,440 2,050,238 1,526,909 1,126,408
Total liabilities and stockholders’ equity 2,866,709 2,693,136    
Parent [Member]
        
Current assets:        
Cash and cash equivalents 168,476 451,431 225,269 165,293
Accounts receivable—oil and gas 81,130 58,662    
Accounts receivable-related parties 570 2,617    
Accounts receivable - intercompany 23,317 21,379    
Prepaid expenses and other current assets 3,352 2,581    
Deferred tax asset 7,558 6,927    
Short-term derivative instruments   324    
Note receivable - related party 875 875    
Total current assets 285,278 544,796    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 2,898,168 2,470,411    
Other property and equipment 12,195 11,102    
Accumulated depletion, depreciation, amortization and impairment (841,539) (784,695)    
Property and equipment, net 2,068,824 1,696,818    
Other assets:        
Equity investments 491,955 432,727    
Derivative instruments 2,565 521    
Other assets 17,581 17,851    
Total other assets 512,101 451,099    
Total assets 2,866,203 2,692,713    
Current liabilities:        
Accounts payable and accrued liabilities 238,593 190,284    
Accounts payable - intercompany    0    
Asset retirement obligation—current 795 795    
Short-term derivative instruments 29,755 12,280    
Current maturities of long-term debt 161 159    
Total current liabilities 269,304 203,518    
Long-term derivative instrument 4,277 11,366    
Asset retirement obligation—long-term 14,650 14,288    
Deferred tax liability 148,470 114,275    
Long-term debt, net of current maturities 299,062 299,028    
Total liabilities 735,763 642,475    
Stockholders’ equity:        
Common stock 853 851    
Paid-in capital 1,817,978 1,813,058    
Accumulated other comprehensive loss (17,059) (9,781)    
Retained earnings (accumulated deficit) 328,668 246,110    
Total stockholders’ equity 2,130,440 2,050,238    
Total liabilities and stockholders’ equity 2,866,203 2,692,713    
Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 1,906 7,525 710 1,795
Accounts receivable—oil and gas 5,638 162    
Accounts receivable-related parties 0 0    
Accounts receivable - intercompany 26 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 7,570 7,714    
Property and equipment:        
Oil and natural gas properties, full-cost accounting 9,381 7,340    
Other property and equipment 29 29    
Accumulated depletion, depreciation, amortization and impairment (22) (22)    
Property and equipment, net 9,388 7,347    
Other assets:        
Equity investments    0    
Derivative instruments 0 0    
Other assets    0    
Total other assets          
Total assets 16,958 15,061    
Current liabilities:        
Accounts payable and accrued liabilities 506 423    
Accounts payable - intercompany 23,238 21,296    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities 23,744 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 23,744 21,719    
Stockholders’ equity:        
Common stock    0    
Paid-in capital 322 322    
Accumulated other comprehensive loss    0    
Retained earnings (accumulated deficit) (7,108) (6,980)    
Total stockholders’ equity (6,786) (6,658)    
Total liabilities and stockholders’ equity 16,958 15,061    
Non-Guarantor [Member]
        
Current assets:        
Cash and cash equivalents 0 0 1 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          
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 190,263 191,473    
Derivative instruments 0 0    
Other assets    0    
Total other assets 190,263 191,473    
Total assets 190,263 191,473    
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 216,347 208,277    
Accumulated other comprehensive loss (17,059) (9,781)    
Retained earnings (accumulated deficit) (9,130) (7,133)    
Total stockholders’ equity 190,158 191,363    
Total liabilities and stockholders’ equity 190,263 191,473    
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 (23,343) (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 (23,343) (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 (182,799) (184,132)    
Derivative instruments 0 0    
Other assets    0    
Total other assets (182,799) (184,132)    
Total assets (206,715) (206,111)    
Current liabilities:        
Accounts payable and accrued liabilities    0    
Accounts payable - intercompany (23,343) (21,406)    
Asset retirement obligation—current    0    
Short-term derivative instruments    0    
Current maturities of long-term debt    0    
Total current liabilities (23,343) (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 (23,343) (21,406)    
Stockholders’ equity:        
Common stock    0    
Paid-in capital (216,669) (208,599)    
Accumulated other comprehensive loss 17,059 9,781    
Retained earnings (accumulated deficit) 16,238 14,113    
Total stockholders’ equity (183,372) (184,705)    
Total liabilities and stockholders’ equity $ (206,715) $ (206,111)