Income Taxes - Components of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
U.S. federal	$ 289	$ (1,462)	$ (493)
U.S. state and local	1,527	1,365	1,657
Non-U.S.	7,965	12,292	5,842
Total current	9,781	12,195	7,006
Deferred
U.S. federal	7,636	1,349	732
U.S. state and local	2,715	1,816	874
Non-U.S.	(3,610)	(4,903)	(17,904)
Total deferred	6,741	(1,738)	(16,298)
Total income tax expense (benefit)	$ 16,522	$ 10,457	$ (9,292)