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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues    
Oil and gas revenues $ 237,252 $ 117,315
Bulk oil sales 27,631 0
Midstream revenues 14,606 6,983
Well services revenues 5,627 5,985
Total revenues 285,116 130,283
Operating expenses    
Lease operating expenses 43,872 31,064
Midstream operating expenses 3,327 1,738
Well services operating expenses 3,902 2,651
Marketing, transportation and gathering expenses 10,951 8,552
Bulk oil purchases 28,002 0
Production taxes 20,299 10,753
Depreciation, depletion and amortization 126,666 122,449
Exploration expenses 1,489 363
Impairment 2,682 3,562
General and administrative expenses 23,834 24,366
Total operating expenses 265,024 205,498
Operating income (loss) 20,092 (75,215)
Other income (expense)    
Equity in earnings of subsidiaries 0 0
Net gain (loss) on derivative instruments 56,075 14,375
Interest expense, net of capitalized interest (36,321) (38,739)
Gain on extinguishment of debt 0 7,016
Other income 16 479
Total other income (expense) 19,770 (16,869)
Income (loss) before income taxes 39,862 (92,084)
Income tax benefit (16,037) 27,629
Net income (loss) 23,825 (64,455)
Intercompany Eliminations [Member]    
Revenues    
Oil and gas revenues 0 0
Bulk oil sales 0  
Midstream revenues 0 0
Well services revenues 0 0
Total revenues 0 0
Operating expenses    
Lease operating expenses 0 0
Midstream operating expenses 0 0
Well services operating expenses 0 0
Marketing, transportation and gathering expenses 0 0
Bulk oil purchases 0  
Production taxes 0 0
Depreciation, depletion and amortization 0 0
Exploration expenses 0 0
Impairment 0 0
General and administrative expenses 0 0
Total operating expenses 0 0
Operating income (loss) 0 0
Other income (expense)    
Equity in earnings of subsidiaries (49,103) 37,327
Net gain (loss) on derivative instruments 0 0
Interest expense, net of capitalized interest 0 0
Gain on extinguishment of debt   0
Other income 0 0
Total other income (expense) (49,103) 37,327
Income (loss) before income taxes (49,103) 37,327
Income tax benefit 0 0
Net income (loss) (49,103) 37,327
Parent/Issuer [Member]    
Revenues    
Oil and gas revenues 0 0
Bulk oil sales 0  
Midstream revenues 0 0
Well services revenues 0 0
Total revenues 0 0
Operating expenses    
Lease operating expenses 0 0
Midstream operating expenses 0 0
Well services operating expenses 0 0
Marketing, transportation and gathering expenses 0 0
Bulk oil purchases 0  
Production taxes 0 0
Depreciation, depletion and amortization 0 0
Exploration expenses 0 0
Impairment 0 0
General and administrative expenses 7,065 7,451
Total operating expenses 7,065 7,451
Operating income (loss) (7,065) (7,451)
Other income (expense)    
Equity in earnings of subsidiaries 49,103 (37,327)
Net gain (loss) on derivative instruments 0 0
Interest expense, net of capitalized interest (32,851) (34,832)
Gain on extinguishment of debt   7,016
Other income 0 43
Total other income (expense) 16,252 (65,100)
Income (loss) before income taxes 9,187 (72,551)
Income tax benefit 14,638 8,096
Net income (loss) 23,825 (64,455)
Combined Guarantor Subsidiaries [Member]    
Revenues    
Oil and gas revenues 237,252 117,315
Bulk oil sales 27,631  
Midstream revenues 14,606 6,983
Well services revenues 5,627 5,985
Total revenues 285,116 130,283
Operating expenses    
Lease operating expenses 43,872 31,064
Midstream operating expenses 3,327 1,738
Well services operating expenses 3,902 2,651
Marketing, transportation and gathering expenses 10,951 8,552
Bulk oil purchases 28,002  
Production taxes 20,299 10,753
Depreciation, depletion and amortization 126,666 122,449
Exploration expenses 1,489 363
Impairment 2,682 3,562
General and administrative expenses 16,769 16,915
Total operating expenses 257,959 198,047
Operating income (loss) 27,157 (67,764)
Other income (expense)    
Equity in earnings of subsidiaries 0 0
Net gain (loss) on derivative instruments 56,075 14,375
Interest expense, net of capitalized interest (3,470) (3,907)
Gain on extinguishment of debt   0
Other income 16 436
Total other income (expense) 52,621 10,904
Income (loss) before income taxes 79,778 (56,860)
Income tax benefit (30,675) 19,533
Net income (loss) $ 49,103 $ (37,327)