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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues        
Oil and gas revenues $ 218,633 $ 159,337 $ 455,885 $ 276,652
Bulk oil sales 8,091 0 35,722 0
Midstream revenues 15,566 6,910 30,172 13,893
Well services revenues 11,801 12,833 17,428 18,818
Total revenues 254,091 179,080 539,207 309,363
Operating expenses        
Lease operating expenses 44,665 31,523 88,537 62,587
Midstream operating expenses 3,263 1,740 6,590 3,478
Well services operating expenses 8,088 7,135 11,990 9,786
Marketing, transportation and gathering expenses 12,039 6,491 22,990 15,043
Bulk oil purchases 7,980 0 35,982 0
Production taxes 18,971 14,367 39,270 25,120
Depreciation, depletion and amortization 125,291 122,488 251,957 244,937
Exploration expenses 1,667 340 3,156 703
Impairment 3,200 23 5,882 3,585
General and administrative expenses 23,548 21,876 47,382 46,242
Total operating expenses 248,712 205,983 513,736 411,481
Loss on sale of properties 0 (1,311) 0 (1,311)
Operating income (loss) 5,379 (28,214) 25,471 (103,429)
Other income (expense)        
Equity in earnings of subsidiaries 0 0 0 0
Net gain (loss) on derivative instruments 50,532 (90,846) 106,607 (76,471)
Interest expense, net of capitalized interest (36,838) (34,979) (73,159) (73,718)
Gain on extinguishment of debt 0 11,642 0 18,658
Other expense (166) (32) (150) 447
Total other income (expense) 13,528 (114,215) 33,298 (131,084)
Income (loss) before income taxes 18,907 (142,429) 58,769 (234,513)
Income tax benefit (2,339) 52,498 (18,376) 80,127
Net income (loss) 16,568 (89,931) 40,393 (154,386)
Intercompany Eliminations [Member]        
Revenues        
Oil and gas revenues 0 0 0 0
Bulk oil sales 0   0  
Midstream revenues 0 0 0 0
Well services revenues 0 0 0 0
Total revenues 0 0 0 0
Operating expenses        
Lease operating expenses 0 0 0 0
Midstream operating expenses 0 0 0 0
Well services operating expenses 0 0 0 0
Marketing, transportation and gathering expenses 0 0 0 0
Bulk oil purchases 0   0  
Production taxes 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Exploration expenses 0 0 0 0
Impairment 0 0 0 0
General and administrative expenses 0 0 0 0
Total operating expenses 0 0 0 0
Loss on sale of properties   0   0
Operating income (loss) 0 0 0 0
Other income (expense)        
Equity in earnings of subsidiaries (38,875) 71,987 (87,978) 109,314
Net gain (loss) on derivative instruments 0 0 0 0
Interest expense, net of capitalized interest 0 0 0 0
Gain on extinguishment of debt   0   0
Other expense 0 0 0 0
Total other income (expense) (38,875) 71,987 (87,978) 109,314
Income (loss) before income taxes (38,875) 71,987 (87,978) 109,314
Income tax benefit 0 0 0 0
Net income (loss) (38,875) 71,987 (87,978) 109,314
Parent/Issuer [Member]        
Revenues        
Oil and gas revenues 0 0 0 0
Bulk oil sales 0   0  
Midstream revenues 0 0 0 0
Well services revenues 0 0 0 0
Total revenues 0 0 0 0
Operating expenses        
Lease operating expenses 0 0 0 0
Midstream operating expenses 0 0 0 0
Well services operating expenses 0 0 0 0
Marketing, transportation and gathering expenses 0 0 0 0
Bulk oil purchases 0   0  
Production taxes 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Exploration expenses 0 0 0 0
Impairment 0 0 0 0
General and administrative expenses 7,534 6,395 14,599 13,846
Total operating expenses 7,534 6,395 14,599 13,846
Loss on sale of properties   0   0
Operating income (loss) (7,534) (6,395) (14,599) (13,846)
Other income (expense)        
Equity in earnings of subsidiaries 38,875 (71,987) 87,978 (109,314)
Net gain (loss) on derivative instruments 0 0 0 0
Interest expense, net of capitalized interest (33,006) (33,190) (65,857) (68,022)
Gain on extinguishment of debt   11,642   18,658
Other expense 0 0 0 43
Total other income (expense) 5,869 (93,535) 22,121 (158,635)
Income (loss) before income taxes (1,665) (99,930) 7,522 (172,481)
Income tax benefit 18,233 9,999 32,871 18,095
Net income (loss) 16,568 (89,931) 40,393 (154,386)
Combined Guarantor Subsidiaries [Member]        
Revenues        
Oil and gas revenues 218,633 159,337 455,885 276,652
Bulk oil sales 8,091   35,722  
Midstream revenues 15,566 6,910 30,172 13,893
Well services revenues 11,801 12,833 17,428 18,818
Total revenues 254,091 179,080 539,207 309,363
Operating expenses        
Lease operating expenses 44,665 31,523 88,537 62,587
Midstream operating expenses 3,263 1,740 6,590 3,478
Well services operating expenses 8,088 7,135 11,990 9,786
Marketing, transportation and gathering expenses 12,039 6,491 22,990 15,043
Bulk oil purchases 7,980   35,982  
Production taxes 18,971 14,367 39,270 25,120
Depreciation, depletion and amortization 125,291 122,488 251,957 244,937
Exploration expenses 1,667 340 3,156 703
Impairment 3,200 23 5,882 3,585
General and administrative expenses 16,014 15,481 32,783 32,396
Total operating expenses 241,178 199,588 499,137 397,635
Loss on sale of properties   (1,311)   (1,311)
Operating income (loss) 12,913 (21,819) 40,070 (89,583)
Other income (expense)        
Equity in earnings of subsidiaries 0 0 0 0
Net gain (loss) on derivative instruments 50,532 (90,846) 106,607 (76,471)
Interest expense, net of capitalized interest (3,832) (1,789) (7,302) (5,696)
Gain on extinguishment of debt   0   0
Other expense (166) (32) (150) 404
Total other income (expense) 46,534 (92,667) 99,155 (81,763)
Income (loss) before income taxes 59,447 (114,486) 139,225 (171,346)
Income tax benefit (20,572) 42,499 (51,247) 62,032
Net income (loss) $ 38,875 $ (71,987) $ 87,978 $ (109,314)