Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Balance Sheets) (Details)

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CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Current assets:        
Cash and cash equivalents $ 124,571 $ 99,557    
Accounts receivable - oil and natural gas sales 157,391 146,773    
Accounts receivable - joint interest and other 39,511 35,440    
Accounts receivable - related parties 79 0    
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 9,742 4,912    
Short-term derivative instruments 19,809 78,847    
Total current assets 351,103 365,529    
Property and equipment:        
Oil and natural gas properties 9,936,714 9,169,156    
Other property and equipment 92,388 86,754    
Accumulated depletion, depreciation, amortization and impairment (4,506,306) (4,153,733)    
Property and equipment, net 5,522,796 5,102,177    
Other assets:        
Equity investments and investments in subsidiaries 232,529 302,112    
Long-term derivative instruments 3,530 8,685    
Deferred tax asset 0 1,208    
Inventories 8,234 8,227    
Other assets 17,038 19,814    
Total other assets 261,331 340,046    
Total assets 6,135,230 5,807,752    
Current liabilities:        
Accounts payable and accrued liabilities 582,464 553,609    
Accounts payable - intercompany 0 0    
Asset retirement obligation—current 120 120 $ 195  
Short-term derivative instruments 62,601 32,534    
Current maturities of long-term debt 647 622    
Total current liabilities 645,832 586,885    
Long-term derivative instruments 15,101 2,989    
Asset retirement obligation—long-term 78,411 74,980 44,266  
Deferred tax liability 3,046 0    
Other non-current liabilities 0 2,963    
Long-term debt, net of current maturities 2,100,825 2,038,321    
Total liabilities 2,843,215 2,706,138    
Stockholders’ equity:        
Common stock 1,732 1,831    
Paid-in capital 4,316,006 4,416,250    
Accumulated other comprehensive (loss) income (46,354) (40,539)    
Retained (deficit) earnings (979,369) (1,275,928)    
Total stockholders’ equity 3,292,015 3,101,614 $ 2,942,661 $ 2,183,892
Total liabilities and stockholders’ equity 6,135,230 5,807,752    
Reportable legal entities | Parent        
Current assets:        
Cash and cash equivalents 89,214 67,908    
Accounts receivable - oil and natural gas sales 111,463 112,686    
Accounts receivable - joint interest and other 19,066 15,435    
Accounts receivable - related parties 79      
Accounts receivable - intercompany 662,319 554,439    
Prepaid expenses and other current assets 7,521 4,719    
Short-term derivative instruments 19,809 78,847    
Total current assets 909,471 834,034    
Property and equipment:        
Oil and natural gas properties 7,003,396 6,562,147    
Other property and equipment 91,637 86,711    
Accumulated depletion, depreciation, amortization and impairment (4,506,267) (4,153,696)    
Property and equipment, net 2,588,766 2,495,162    
Other assets:        
Equity investments and investments in subsidiaries 2,723,140 2,361,575    
Long-term derivative instruments 3,530 8,685    
Deferred tax asset   1,208    
Inventories 6,800 5,816    
Other assets 13,018 12,483    
Total other assets 2,746,488 2,389,767    
Total assets 6,244,725 5,718,963    
Current liabilities:        
Accounts payable and accrued liabilities 464,426 416,249    
Accounts payable - intercompany 240,310 63,373    
Asset retirement obligation—current 120 120    
Short-term derivative instruments 62,601 32,534    
Current maturities of long-term debt 647 622    
Total current liabilities 768,104 512,898    
Long-term derivative instruments 15,101 2,989    
Asset retirement obligation—long-term 65,634 63,141    
Deferred tax liability 3,046      
Other non-current liabilities   0    
Long-term debt, net of current maturities 2,100,825 2,038,321    
Total liabilities 2,952,710 2,617,349    
Stockholders’ equity:        
Common stock 1,732 1,831    
Paid-in capital 4,316,006 4,416,250    
Accumulated other comprehensive (loss) income (46,354) (40,539)    
Retained (deficit) earnings (979,369) (1,275,928)    
Total stockholders’ equity 3,292,015 3,101,614    
Total liabilities and stockholders’ equity 6,244,725 5,718,963    
Reportable legal entities | Guarantors        
Current assets:        
Cash and cash equivalents 35,357 31,649    
Accounts receivable - oil and natural gas sales 45,928 34,087    
Accounts receivable - joint interest and other 20,445 20,005    
Accounts receivable - related parties 0      
Accounts receivable - intercompany 240,373 63,374    
Prepaid expenses and other current assets 2,221 193    
Short-term derivative instruments 0 0    
Total current assets 344,324 149,308    
Property and equipment:        
Oil and natural gas properties 2,934,047 2,607,738    
Other property and equipment 751 43    
Accumulated depletion, depreciation, amortization and impairment (39) (37)    
Property and equipment, net 2,934,759 2,607,744    
Other assets:        
Equity investments and investments in subsidiaries   77,744    
Long-term derivative instruments 0 0    
Deferred tax asset   0    
Inventories 1,434 2,411    
Other assets 4,020 7,331    
Total other assets 5,454 87,486    
Total assets 3,284,537 2,844,538    
Current liabilities:        
Accounts payable and accrued liabilities 118,038 137,361    
Accounts payable - intercompany 662,254 554,313    
Asset retirement obligation—current 0 0    
Short-term derivative instruments 0 0    
Current maturities of long-term debt 0 0    
Total current liabilities 780,292 691,674    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 12,777 11,839    
Deferred tax liability 0      
Other non-current liabilities   2,963    
Long-term debt, net of current maturities 0 0    
Total liabilities 793,069 706,476    
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 575,870 222,464    
Total stockholders’ equity 2,491,468 2,138,062    
Total liabilities and stockholders’ equity 3,284,537 2,844,538    
Reportable legal entities | Non-Guarantor        
Current assets:        
Cash and cash equivalents 0 0    
Accounts receivable - oil and natural gas sales 0 0    
Accounts receivable - joint interest and other 0 0    
Accounts receivable - related parties 0      
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets 0 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 53,380 57,641    
Long-term derivative instruments 0 0    
Deferred tax asset   0    
Inventories 0 0    
Other assets 0 0    
Total other assets 53,380 57,641    
Total assets 53,380 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    
Long-term debt, net of current maturities 0 0    
Total liabilities 128 127    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital 261,626 259,307    
Accumulated other comprehensive (loss) income (44,338) (38,593)    
Retained (deficit) earnings (164,036) (163,200)    
Total stockholders’ equity 53,252 57,514    
Total liabilities and stockholders’ equity 53,380 57,641    
Eliminations        
Current assets:        
Cash and cash equivalents 0 0    
Accounts receivable - oil and natural gas sales 0 0    
Accounts receivable - joint interest and other 0 0    
Accounts receivable - related parties 0      
Accounts receivable - intercompany (902,692) (617,813)    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets (902,692) (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 (2,543,991) (2,194,848)    
Long-term derivative instruments 0 0    
Deferred tax asset   0    
Inventories 0 0    
Other assets 0 0    
Total other assets (2,543,991) (2,194,848)    
Total assets (3,447,412) (2,813,390)    
Current liabilities:        
Accounts payable and accrued liabilities 0 (1)    
Accounts payable - intercompany (902,692) (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 (902,692) (617,814)    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability 0      
Other non-current liabilities   0    
Long-term debt, net of current maturities 0 0    
Total liabilities (902,692) (617,814)    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital (2,177,224) (2,174,905)    
Accumulated other comprehensive (loss) income 44,338 38,593    
Retained (deficit) earnings (411,834) (59,264)    
Total stockholders’ equity (2,544,720) (2,195,576)    
Total liabilities and stockholders’ equity $ (3,447,412) $ (2,813,390)