Income Taxes - Components of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
U.S. federal	$ (20,305)	$ 289	$ (1,462)
U.S. state and local	930	1,527	1,365
Non-U.S.	8,059	7,965	12,292
Total current	(11,316)	9,781	12,195
Deferred
U.S. federal	13,350	7,636	1,349
U.S. state and local	886	2,715	1,816
Non-U.S.	(2,468)	(3,610)	(4,903)
Total deferred	11,768	6,741	(1,738)
Total income tax expense	$ 452	$ 16,522	$ 10,457