Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets:        
Cash and cash equivalents $ 118,613 $ 99,557    
Accounts receivable—oil and natural gas 199,457 182,213    
Accounts receivable - intercompany   0    
Prepaid expenses and other current assets 7,564 4,912    
Short-term derivative instruments 50,906 78,847    
Total current assets 376,540 365,529    
Property and equipment:        
Oil and natural gas properties 9,470,697 9,169,156    
Other property and equipment 89,648 86,754    
Accumulated depletion, depreciation, amortization and impairment (4,264,647) (4,153,733)    
Property and equipment, net 5,295,698 5,102,177    
Other assets        
Equity investments and investments in subsidiaries 311,694 302,112    
Long-term derivative instruments 15,769 8,685    
Deferred tax asset 0 1,208    
Inventories 8,505 8,227    
Other assets 20,186 19,814    
Total other assets 356,154 340,046    
Total assets 6,028,392 5,807,752    
Current liabilities:        
Accounts payable and accrued liabilities 577,548 553,609    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 120 120 $ 195  
Short-term derivative instruments 37,570 32,534    
Current maturities of long-term debt 629 622    
Total current liabilities 615,867 586,885    
Long-term derivative instruments 2,499 2,989    
Asset retirement obligation—long-term 76,267 74,980 41,142  
Deferred tax liability 2,884 0    
Other non-current liabilities 2,963 2,963    
Long-term debt, net of current maturities 2,239,023 2,038,321    
Total liabilities 2,939,503 2,706,138    
Stockholders’ equity:        
Common stock 1,735 1,831    
Paid-in capital 4,319,034 4,416,250    
Accumulated other comprehensive (loss) income (46,042) (40,539)    
Retained (deficit) earnings (1,185,838) (1,275,928)    
Total stockholders’ equity 3,088,889 3,101,614 $ 2,801,754 $ 2,183,892
Total liabilities and stockholders’ equity 6,028,392 5,807,752    
Reportable Legal Entities | Parent        
Current assets:        
Cash and cash equivalents 81,357 67,908    
Accounts receivable—oil and natural gas 133,387 128,121    
Accounts receivable - intercompany 585,111 554,439    
Prepaid expenses and other current assets 6,115 4,719    
Short-term derivative instruments 50,906 78,847    
Total current assets 856,876 834,034    
Property and equipment:        
Oil and natural gas properties 6,769,164 6,562,147    
Other property and equipment 89,597 86,711    
Accumulated depletion, depreciation, amortization and impairment (4,264,609) (4,153,696)    
Property and equipment, net 2,594,152 2,495,162    
Other assets        
Equity investments and investments in subsidiaries 2,458,237 2,361,575    
Long-term derivative instruments 15,769 8,685    
Deferred tax asset 0 1,208    
Inventories 6,045 5,816    
Other assets 13,569 12,483    
Total other assets 2,493,620 2,389,767    
Total assets 5,944,648 5,718,963    
Current liabilities:        
Accounts payable and accrued liabilities 443,963 416,249    
Accounts payable - intercompany 64,980 63,373    
Asset retirement obligation—current 120 120    
Short-term derivative instruments 37,570 32,534    
Current maturities of long-term debt 629 622    
Total current liabilities 547,262 512,898    
Long-term derivative instruments 2,499 2,989    
Asset retirement obligation—long-term 64,091 63,141    
Deferred tax liability 2,884      
Other non-current liabilities 0 0    
Long-term debt, net of current maturities 2,239,023 2,038,321    
Total liabilities 2,855,759 2,617,349    
Stockholders’ equity:        
Common stock 1,735 1,831    
Paid-in capital 4,319,034 4,416,250    
Accumulated other comprehensive (loss) income (46,042) (40,539)    
Retained (deficit) earnings (1,185,838) (1,275,928)    
Total stockholders’ equity 3,088,889 3,101,614    
Total liabilities and stockholders’ equity 5,944,648 5,718,963    
Reportable Legal Entities | Guarantors        
Current assets:        
Cash and cash equivalents 37,254 31,649    
Accounts receivable—oil and natural gas 66,070 54,092    
Accounts receivable - intercompany 64,492 63,374    
Prepaid expenses and other current assets 1,449 193    
Short-term derivative instruments 0 0    
Total current assets 169,265 149,308    
Property and equipment:        
Oil and natural gas properties 2,702,262 2,607,738    
Other property and equipment 51 43    
Accumulated depletion, depreciation, amortization and impairment (38) (37)    
Property and equipment, net 2,702,275 2,607,744    
Other assets        
Equity investments and investments in subsidiaries 77,350 77,744    
Long-term derivative instruments 0 0    
Deferred tax asset 0 0    
Inventories 2,460 2,411    
Other assets 6,617 7,331    
Total other assets 86,427 87,486    
Total assets 2,957,967 2,844,538    
Current liabilities:        
Accounts payable and accrued liabilities 133,585 137,361    
Accounts payable - intercompany 584,495 554,313    
Asset retirement obligation—current 0 0    
Short-term derivative instruments 0 0    
Current maturities of long-term debt 0 0    
Total current liabilities 718,080 691,674    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 12,176 11,839    
Deferred tax liability 0      
Other non-current liabilities 2,963 2,963    
Long-term debt, net of current maturities 0 0    
Total liabilities 733,219 706,476    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital 1,915,598 1,915,598    
Accumulated other comprehensive (loss) income 0 0    
Retained (deficit) earnings 309,150 222,464    
Total stockholders’ equity 2,224,748 2,138,062    
Total liabilities and stockholders’ equity 2,957,967 2,844,538    
Reportable Legal Entities | Non-Guarantor        
Current assets:        
Cash and cash equivalents 2 0    
Accounts receivable—oil and natural gas 0 0    
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets 2 0    
Property and equipment:        
Oil and natural gas properties 0 0    
Other property and equipment 0 0    
Accumulated depletion, depreciation, amortization and impairment 0 0    
Property and equipment, net 0 0    
Other assets        
Equity investments and investments in subsidiaries 53,563 57,641    
Long-term derivative instruments 0 0    
Deferred tax asset 0 0    
Inventories 0 0    
Other assets 0 0    
Total other assets 53,563 57,641    
Total assets 53,565 57,641    
Current liabilities:        
Accounts payable and accrued liabilities 0 0    
Accounts payable - intercompany 128 127    
Asset retirement obligation—current 0 0    
Short-term derivative instruments 0 0    
Current maturities of long-term debt 0 0    
Total current liabilities 128 127    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability 0      
Other non-current liabilities 0 0    
Long-term debt, net of current maturities 0 0    
Total liabilities 128 127    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital 260,877 259,307    
Accumulated other comprehensive (loss) income (43,909) (38,593)    
Retained (deficit) earnings (163,531) (163,200)    
Total stockholders’ equity 53,437 57,514    
Total liabilities and stockholders’ equity 53,565 57,641    
Eliminations        
Current assets:        
Cash and cash equivalents 0 0    
Accounts receivable—oil and natural gas 0 0    
Accounts receivable - intercompany (649,603) (617,813)    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets (649,603) (617,813)    
Property and equipment:        
Oil and natural gas properties (729) (729)    
Other property and equipment 0 0    
Accumulated depletion, depreciation, amortization and impairment 0 0    
Property and equipment, net (729) (729)    
Other assets        
Equity investments and investments in subsidiaries (2,277,456) (2,194,848)    
Long-term derivative instruments 0 0    
Deferred tax asset 0 0    
Inventories 0 0    
Other assets 0 0    
Total other assets (2,277,456) (2,194,848)    
Total assets (2,927,788) (2,813,390)    
Current liabilities:        
Accounts payable and accrued liabilities 0 (1)    
Accounts payable - intercompany (649,603) (617,813)    
Asset retirement obligation—current 0 0    
Short-term derivative instruments 0 0    
Current maturities of long-term debt 0 0    
Total current liabilities (649,603) (617,814)    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability 0      
Other non-current liabilities 0 0    
Long-term debt, net of current maturities 0 0    
Total liabilities (649,603) (617,814)    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital (2,176,475) (2,174,905)    
Accumulated other comprehensive (loss) income 43,909 38,593    
Retained (deficit) earnings (145,619) (59,264)    
Total stockholders’ equity (2,278,185) (2,195,576)    
Total liabilities and stockholders’ equity $ (2,927,788) $ (2,813,390)