Income Taxes - Significant Components of Income Tax Provision/(Benefit) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S.	$ (397)	$ 1,635	$ (1,312)
Non-U.S.	12,538	7,150	13,729
Total Current	12,141	8,785	12,417
Deferred:
U.S.	(330)	17,597	13,245
Non-U.S.	(240)	(577)	(2,797)
Total Deferred	(570)	17,020	10,448
Total provision for income taxes	$ 11,571	$ 25,805	$ 22,865