Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current expense (benefit):
Federal									$ (937)	$ 479	$ (1,132)
State									437	662	582
Foreign									8,407	8,037	6,000
Total current expense									7,907	9,178	5,450
Deferred expense (benefit):
Federal									(2,688)	(8,111)	4,400
State									(4,524)	(3,523)	(667)
Foreign									(4,083)	(802)	(1,681)
Total deferred expense (benefit)									(11,295)	(12,436)	2,052
Total income tax expense (benefit)	$ (2,133)	$ 825	$ (3,242)	$ 1,162	$ (3,757)	$ (2,292)	$ 2,140	$ 651	$ (3,388)	$ (3,258)	$ 7,502