Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate									35.00%	35.00%	35.00%
Effect of:
Tax benefit at federal statutory rate									$ (15,384)	$ (15,192)	$ (14,393)
State taxes, net of federal benefit									(1,377)	(1,833)	(347)
Non-taxable flow-through earnings									0	0	12,336
Foreign									256	(64)	(130)
Recognition of deferred tax assets									0	0	(29,870)
Valuation allowance									17,013	17,697	32,440
Other									(484)	(615)	(4)
Total income tax provision	$ 1	$ (8)	$ 12	$ 19	$ 2	$ (31)	$ 106	$ (84)	$ 24	$ (7)	$ 32