Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 3,739	$ 11,526	$ 15,376
State	498	956	1,513
Foreign	3,788	2,425	2,104
Total Current	8,025	14,907	18,993
Deferred:
Federal	2,646	(2,472)	(594)
State	380	256	601
Foreign	(2,598)	(717)	(1,179)
Total Deferred	428	(2,933)	(1,172)
Provision for income taxes	$ 8,453	$ 11,974	$ 17,821