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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal									$ (21,859)	$ (8,025)	$ 46,680
State									(3,938)	460	1,079
Foreign									9,550	5,099	161
Current Income Tax Expense (Benefit)									(16,247)	(2,466)	47,920
Deferred:
Federal									27,289	(22,054)	(27,173)
State									702	4,701	(3,719)
Foreign									2,719	(2,806)	2,754
Provision for (reversal of) valuation allowance on deferred tax assets									(29,979)	15,639	97,069
Deferred Income Tax Expense (Benefit)									731	(4,520)	68,931
Total	$ (51)	$ (20,418)	$ 2,828	$ 2,125	$ 228	$ (7,110)	$ (9,180)	$ 9,076	$ (15,516)	$ (6,986)	$ 116,851

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