Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ 106	$ 53	$ 208
State	75	53	(125)
Foreign	2,008	2,527	3,405
Total current income tax provision	2,189	2,633	3,488
Deferred
Federal	581	(6,112)	(16,916)
State	2,428	(597)	(1,142)
Foreign	(1,182)	(970)	(1,044)
Total deferred income tax provision (benefit)	1,827	(7,679)	(19,102)
Total deferred income tax provision (benefit)	$ 4,016	$ (5,046)	$ (15,614)