Income Taxes - Provision For Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S. Federal	$ 805	$ (236)	$ (37,854)
State	1,384	561	20
Foreign	12,572	10,301	10,440
Total current	14,761	10,626	(27,394)
Deferred:
U.S. Federal	(331)	(3,848)	2,670
State	66	(796)	(181)
Foreign	501	(1,089)	863
Total deferred	236	(5,733)	3,352
Total income tax expense (benefit)	$ 14,997	$ 4,893	$ (24,042)