Income Taxes - Effective Income Tax Rate Reconciliation (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
Income Tax Disclosure [Abstract]
Computed federal income tax expense at applicable statutory rate of 21%									$ (2,778)	$ 461	$ 10,399
State income tax expense (benefit)									(1,448)	(2,241)	(59)
Tax credits									(2,098)	(1,567)	(1,734)
Foreign tax rate differential									(1,230)	(1,536)	(1,361)
Uncertain tax positions									(576)	(794)	267
Deferred compensation insurance assets									(299)	(503)	186
Transaction-related expenses										154	223
U.S. transition tax											(3,271)
TCJA remeasurement of deferred taxes											(71)
Stock-based payments									(1,815)	(1,654)	(4,278)
Net GILTI									3,960	1,861	347
Foreign withholding tax									228	638	5,590
Foreign permanent differences									1,728	937	96
Valuation allowance									1,879	131	21
DOJ Settlement									1,890
Remeasurement of state deferred taxes									(1,765)
Other - including the effect of graduated rates									(1,064)	855	1,147
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