Income Taxes - Domestic and Foreign Income Loss 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.	$ (47,205)	$ 24,397	$ 176,820
Foreign	323,805	901,565	287,821
Income before income taxes	$ 276,600	$ 925,962	$ 464,641