Income Taxes - Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal current	$ 0	$ 0	$ 0
Federal deferred	(4,231)	(21,700)	(25,023)
State current	25	70	32
State deferred	(114)	(927)	(3,959)
Foreign current	1,783	2,149	(1,898)
Foreign deferred	(9)	(3,162)	7,905
Income Tax Expense (Benefit)	$ (2,546)	$ (23,570)	$ (22,943)