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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Current assets:        
Cash and cash equivalents $ 17,996 $ 52,297    
Accounts receivable - oil and natural gas sales 144,996 210,200    
Accounts receivable - joint interest and other 24,580 22,497    
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 12,560 10,607    
Short-term derivative instruments 17,958 21,352    
Total current assets 218,090 316,953    
Property and equipment:        
Oil and natural gas properties 10,312,124 10,026,836    
Other property and equipment 96,204 92,667    
Accumulated depletion, depreciation, amortization and impairment (4,757,814) (4,640,098)    
Property and equipment, net 5,650,514 5,479,405    
Other assets:        
Equity investments and investments in subsidiaries 244,119 236,121    
Inventories 11,018 4,754    
Operating lease assets 29,795 0    
Operating lease assets - related parties 58,659 0    
Other assets 13,314 13,803    
Total other assets 356,905 254,678    
Total assets 6,225,509 6,051,036    
Current liabilities:        
Accounts payable and accrued liabilities 568,184 518,380    
Accounts payable - intercompany 0 0    
Short-term derivative instruments 25,921 20,401    
Current portion of operating lease liabilities 27,983 0    
Current portion of operating lease liabilities - related parties 20,618 0    
Current maturities of long-term debt 656 651    
Total current liabilities 643,362 539,432    
Long-term derivative instruments 287 13,992    
Asset retirement obligation—long-term 82,900 79,952 $ 76,267  
Deferred tax liability 3,127 3,127    
Non-current operating lease liabilities 1,812 0    
Non-current operating lease liabilities - related parties 38,041 0    
Long-term debt, net of current maturities 2,087,714 2,086,765    
Total liabilities 2,857,243 2,723,268    
Stockholders’ equity:        
Common stock 1,594 1,630    
Paid-in capital 4,202,023 4,227,532    
Accumulated other comprehensive (loss) income (52,225) (56,026)    
(Accumulated deficit) retained earnings (783,126) (845,368)    
Total stockholders’ equity 3,368,266 3,327,768 $ 3,088,889 $ 3,101,614
Total liabilities and stockholders’ equity 6,225,509 6,051,036    
Reportable legal entities | Parent        
Current assets:        
Cash and cash equivalents 7,040 25,585    
Accounts receivable - oil and natural gas sales 93,698 146,075    
Accounts receivable - joint interest and other 12,084 16,212    
Accounts receivable - intercompany 694,036 671,633    
Prepaid expenses and other current assets 11,412 8,433    
Short-term derivative instruments 17,958 21,352    
Total current assets 836,228 889,290    
Property and equipment:        
Oil and natural gas properties 7,238,631 7,044,550    
Other property and equipment 92,135 91,916    
Accumulated depletion, depreciation, amortization and impairment (4,757,774) (4,640,059)    
Property and equipment, net 2,572,992 2,496,407    
Other assets:        
Equity investments and investments in subsidiaries 2,963,629 2,856,988    
Inventories 9,264 3,620    
Operating lease assets 29,795      
Operating lease assets - related parties 58,659      
Other assets 12,187 12,624    
Total other assets 3,073,534 2,873,232    
Total assets 6,482,754 6,258,929    
Current liabilities:        
Accounts payable and accrued liabilities 449,459 419,107    
Accounts payable - intercompany 388,879 320,259    
Short-term derivative instruments 25,921 20,401    
Current portion of operating lease liabilities 27,983      
Current portion of operating lease liabilities - related parties 20,618      
Current maturities of long-term debt 656 651    
Total current liabilities 913,516 760,418    
Long-term derivative instruments 287 13,992    
Asset retirement obligation—long-term 69,991 66,859    
Deferred tax liability 3,127 3,127    
Non-current operating lease liabilities 1,812      
Non-current operating lease liabilities - related parties 38,041      
Long-term debt, net of current maturities 2,087,714 2,086,765    
Total liabilities 3,114,488 2,931,161    
Stockholders’ equity:        
Common stock 1,594 1,630    
Paid-in capital 4,202,023 4,227,532    
Accumulated other comprehensive (loss) income (52,225) (56,026)    
(Accumulated deficit) retained earnings (783,126) (845,368)    
Total stockholders’ equity 3,368,266 3,327,768    
Total liabilities and stockholders’ equity 6,482,754 6,258,929    
Reportable legal entities | Guarantors        
Current assets:        
Cash and cash equivalents 10,955 26,711    
Accounts receivable - oil and natural gas sales 51,298 64,125    
Accounts receivable - joint interest and other 12,496 6,285    
Accounts receivable - intercompany 388,797 319,464    
Prepaid expenses and other current assets 1,148 2,174    
Short-term derivative instruments 0 0    
Total current assets 464,694 418,759    
Property and equipment:        
Oil and natural gas properties 3,074,222 2,983,015    
Other property and equipment 4,069 751    
Accumulated depletion, depreciation, amortization and impairment (40) (39)    
Property and equipment, net 3,078,251 2,983,727    
Other assets:        
Equity investments and investments in subsidiaries   0    
Inventories 1,754 1,134    
Operating lease assets 0      
Operating lease assets - related parties 0      
Other assets 1,127 1,178    
Total other assets 2,881 2,312    
Total assets 3,545,826 3,404,798    
Current liabilities:        
Accounts payable and accrued liabilities 118,725 99,273    
Accounts payable - intercompany 693,826 670,708    
Short-term derivative instruments 0 0    
Current portion of operating lease liabilities 0      
Current portion of operating lease liabilities - related parties 0      
Current maturities of long-term debt 0 0    
Total current liabilities 812,551 769,981    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 12,909 13,093    
Deferred tax liability 0 0    
Non-current operating lease liabilities 0      
Non-current operating lease liabilities - related parties 0      
Long-term debt, net of current maturities 0 0    
Total liabilities 825,460 783,074    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital 1,915,598 1,915,598    
Accumulated other comprehensive (loss) income 0 0    
(Accumulated deficit) retained earnings 804,768 706,126    
Total stockholders’ equity 2,720,366 2,621,724    
Total liabilities and stockholders’ equity 3,545,826 3,404,798    
Reportable legal entities | Non-Guarantor        
Current assets:        
Cash and cash equivalents 1 1    
Accounts receivable - oil and natural gas sales 0 0    
Accounts receivable - joint interest and other 0 0    
Accounts receivable - intercompany 0 0    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets 1 1    
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 48,004 44,259    
Inventories 0 0    
Operating lease assets 0      
Operating lease assets - related parties 0      
Other assets 0 0    
Total other assets 48,004 44,259    
Total assets 48,005 44,260    
Current liabilities:        
Accounts payable and accrued liabilities 0 0    
Accounts payable - intercompany 129 130    
Short-term derivative instruments 0 0    
Current portion of operating lease liabilities 0      
Current portion of operating lease liabilities - related parties 0      
Current maturities of long-term debt 0 0    
Total current liabilities 129 130    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability 0 0    
Non-current operating lease liabilities 0      
Non-current operating lease liabilities - related parties 0      
Long-term debt, net of current maturities 0 0    
Total liabilities 129 130    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital 262,059 261,626    
Accumulated other comprehensive (loss) income (50,076) (53,783)    
(Accumulated deficit) retained earnings (164,107) (163,713)    
Total stockholders’ equity 47,876 44,130    
Total liabilities and stockholders’ equity 48,005 44,260    
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 - intercompany (1,082,833) (991,097)    
Prepaid expenses and other current assets 0 0    
Short-term derivative instruments 0 0    
Total current assets (1,082,833) (991,097)    
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 (2,767,514) (2,665,126)    
Inventories 0 0    
Operating lease assets 0      
Operating lease assets - related parties 0      
Other assets 0 1    
Total other assets (2,767,514) (2,665,125)    
Total assets (3,851,076) (3,656,951)    
Current liabilities:        
Accounts payable and accrued liabilities 0 0    
Accounts payable - intercompany (1,082,834) (991,097)    
Short-term derivative instruments 0 0    
Current portion of operating lease liabilities 0      
Current portion of operating lease liabilities - related parties 0      
Current maturities of long-term debt 0 0    
Total current liabilities (1,082,834) (991,097)    
Long-term derivative instruments 0 0    
Asset retirement obligation—long-term 0 0    
Deferred tax liability 0 0    
Non-current operating lease liabilities 0      
Non-current operating lease liabilities - related parties 0      
Long-term debt, net of current maturities 0 0    
Total liabilities (1,082,834) (991,097)    
Stockholders’ equity:        
Common stock 0 0    
Paid-in capital (2,177,657) (2,177,224)    
Accumulated other comprehensive (loss) income 50,076 53,783    
(Accumulated deficit) retained earnings (640,661) (542,413)    
Total stockholders’ equity (2,768,242) (2,665,854)    
Total liabilities and stockholders’ equity $ (3,851,076) $ (3,656,951)