Stockholders' Equity - AOCI Disclosure (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ 105,665	$ 106,502	$ 118,176
Other comprehensive loss before reclassifications		(3,462)	5,415	(9,309)
Amounts reclassified from AOCI to Other income, net		48	77	100
Other comprehensive (loss) income, net of tax	[1]	(3,414)	5,492	(9,209)
Ending Balance		99,515	105,665	106,502
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(11,247)	(16,651)	(7,363)
Other comprehensive loss before reclassifications		(3,473)	5,404	(9,288)
Amounts reclassified from AOCI to Other income, net		0	0	0
Other comprehensive (loss) income, net of tax		(3,473)	5,404	(9,288)
Ending Balance		(14,720)	(11,247)	(16,651)
Unrealized Gain (Loss) on Available for Sale Marketable Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(1)	0	1
Other comprehensive loss before reclassifications		1	(1)	(1)
Amounts reclassified from AOCI to Other income, net		0	0	0
Other comprehensive (loss) income, net of tax		1	(1)	(1)
Ending Balance		0	(1)	0
Interest Rate Swaps
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(69)	(158)	(238)
Other comprehensive loss before reclassifications		10	12	(20)
Amounts reclassified from AOCI to Other income, net		48	77	100
Other comprehensive (loss) income, net of tax		58	89	80
Ending Balance		(11)	(69)	(158)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(11,317)	(16,809)	(7,600)
Other comprehensive (loss) income, net of tax		(3,414)	5,492	(9,209)
Ending Balance		$ (14,731)	$ (11,317)	$ (16,809)

[1] Tax impact was nominal for all periods.