Income Taxes - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. federal	$ 9,465	$ 164	$ 1,750
U.S. state	3,834	419	477
Non-U.S.	1,065	453	435
Total current	14,364	1,036	2,662
Deferred:
U.S. federal	(517)	(9,431)	2,235
U.S. state	(1,629)	(540)	1,059
Non-U.S.	(20)	(602)	(65)
Total deferred	(2,166)	(10,573)	3,229
Total income tax expense (benefit)	$ 12,198	$ (9,537)	$ 5,891