Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 182,596	$ 179,189
Current period other comprehensive income (loss) before reclassifications	108	6
Reclassification of amounts to earnings	(65)	(16)
Net other comprehensive income (loss) during period	43	(10)	[1]
Ending balance	173,631	184,900
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6)	(64)
Current period other comprehensive income (loss) before reclassifications	15	(37)
Reclassification of amounts to earnings	0	0
Net other comprehensive income (loss) during period	15	(37)
Ending balance	9	(101)
Gain on Derivative Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	223	216
Current period other comprehensive income (loss) before reclassifications	(35)	160
Reclassification of amounts to earnings	(65)	(16)
Net other comprehensive income (loss) during period	(100)	144
Ending balance	123	360
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,126)	(411)
Current period other comprehensive income (loss) before reclassifications	128	(117)
Reclassification of amounts to earnings	0	0
Net other comprehensive income (loss) during period	128	(117)
Ending balance	(998)	(528)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(909)	(259)
Ending balance	$ (866)	$ (269)

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