Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed federal income tax expense at applicable statutory rate									$ 461	$ 10,399	$ 12,559
State income taxes									(2,241)	(59)	279
Tax credits									(1,567)	(1,734)	(1,377)
Foreign tax rate differential									(1,536)	(1,361)	(3,329)
Uncertain tax positions									(794)	267	(19)
Deferred compensation insurance assets									(503)	186	(479)
Transaction-related expenses									154	223	90
U.S. transition tax										(3,271)	10,612
TCJA remeasurement of deferred taxes										(71)	(8,383)
Stock-based payments									(1,654)	(4,278)	(2,264)
Bargain purchase gain											(1,570)
In-process research and development											1,486
Net GILTI									1,861	347
Foreign withholding tax									638	5,590
Other - including the effect of graduated rates									1,923	1,264	753
Total income tax expense (benefit)	$ (3,757)	$ (2,292)	$ 2,140	$ 651	$ 3,022	$ 2,766	$ 624	$ 1,090	$ (3,258)	$ 7,502	$ 8,358