Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant	$ (1,623)	$ (1,471)
Deferred compensation	(549)	(314)
Total	(31,880)	(23,451)
Commodity Derivatives
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	630	472
Liabilities	(30,338)	(22,138)
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Deferred compensation	(107)
Total	(107)
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total	(29,708)	(21,666)
Significant Other Observable Inputs (Level 2) | Commodity Derivatives
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	630	472
Liabilities	(30,338)	(22,138)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant	(1,623)	(1,471)
Deferred compensation	(442)	(314)
Total	$ (2,065)	$ (1,785)