Income Taxes - Income from Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S.	$ (76,805)	$ (122,082)	$ 88,964
Foreign	12,051	9,856	31,093
Income (loss) from continuing operations before income taxes	$ (64,754)	$ (112,226)	$ 120,057