Income Taxes - Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic	$ (3,106)	$ (7,820)	$ 4,502
Foreign	67,183	55,613	16,134
Income before income taxes	$ 64,077	$ 47,793	$ 20,636