Income Taxes - Effective Income Tax Rate Reconcilliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax at statutory rates	$ (39,361)	$ (82,226)	$ (53,673)
State income taxes, net of federal income tax benefits	(5,118)	(8,784)	(651)
Effective Income Tax Rate Reconciliation, Section 956 Inclusion, Amount	(13,132)	0	0
Effective Income Tax Rate Reconciliation, Cancellation of Debt, Amount	3,024	0	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	0	0	10,454
Other permanent differences	2,719	2,369	285
Federal and state income tax on joint venture	(1,660)	(558)	2,912
Rate differential on foreign income	795	3,305	11,512
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	23,746	63,511	4,888
Audit settlements	0	171	99
Other	177	(1,358)	1,231
Income tax (benefit)	$ (2,546)	$ (23,570)	$ (22,943)
Effective income tax (benefit) rate	2.30%	10.00%	15.00%