Restatement of Previously Issued Financial Statements - Schedule of Unaudited Condensed Consolidated Statements of Cash Flows, Including Balances Originally Reported, Corrections and as Restated Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net (loss) income	$ (16,536)	$ 3,118
Depreciation, depletion and amortization	15,382	11,954
Deferred taxes	(3,191)	1,707
Net cash provided by operating activities	9,847	12,968
As Previously Reported
Cash flows from operating activities
Net (loss) income	(16,652)	3,066
Depreciation, depletion and amortization	15,520	12,122
Deferred taxes	(3,213)	1,591
Net cash provided by operating activities	9,847	12,968
Correction
Cash flows from operating activities
Net (loss) income	116	52
Depreciation, depletion and amortization	(138)	(168)
Deferred taxes	$ 22	$ 116