Restatement of Previously Issued Financial Statements - Schedule of Consolidated Statements of Operations, Including Balances Originally Reported, Corrections and Restated Balances (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Depletion, depreciation, and amortization	$ 56,818	$ 51,995
Impairment of oil and gas properties	33,413	35,570
Total expenses	129,509	122,479
Loss from operations	(35,441)	(64,507)
Loss before income taxes	(72,504)	(73,714)
Income tax benefit (expense)	29,019	(24,986)
Net loss attributable to common stockholders	$ (47,453)	$ (98,700)
Net loss per common share
Basic	$ (2.13)	$ (12.17)
Diluted	$ (2.13)	$ (12.17)
As Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Depletion, depreciation, and amortization	$ 52,718	$ 46,888
Impairment of oil and gas properties	33,413	33,893
Total expenses	125,409	115,695
Loss from operations	(31,341)	(57,723)
Loss before income taxes	(68,404)	(66,930)
Income tax benefit (expense)	29,741	(27,405)
Net loss attributable to common stockholders	$ (42,631)	$ (94,335)
Net loss per common share
Basic	$ (1.92)	$ (11.64)
Diluted	$ (1.92)	$ (11.64)
Correction
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Depletion, depreciation, and amortization	$ 4,100	$ 5,107
Impairment of oil and gas properties		1,677
Total expenses	4,100	6,784
Loss from operations	(4,100)	(6,784)
Loss before income taxes	(4,100)	(6,784)
Income tax benefit (expense)	(722)	2,419
Net loss attributable to common stockholders	$ (4,822)	$ (4,365)
Net loss per common share
Basic	$ (0.21)	$ (0.53)
Diluted	$ (0.21)	$ (0.53)