Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 173,631	$ 184,900	$ 182,596	$ 179,189
Current period other comprehensive income (loss) before reclassifications	(18)	(250)	91	(244)
Amounts reclassified from accumulated other comprehensive income	(42)	(42)	(108)	(58)
Net other comprehensive income (loss) during period	(60)	(292)	(17)	(302)	[1]
Ending balance	94,916	185,590	94,916	185,590
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9	(101)	(6)	(64)
Current period other comprehensive income (loss) before reclassifications	3	34	19	(3)
Amounts reclassified from accumulated other comprehensive income	(12)	0	(13)	0
Net other comprehensive income (loss) during period	(9)	34	6	(3)
Ending balance	0	(67)	0	(67)
Gain (Loss) on Derivative Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	123	360	223	216
Current period other comprehensive income (loss) before reclassifications	(93)	54	(128)	214
Amounts reclassified from accumulated other comprehensive income	(30)	(42)	(95)	(58)
Net other comprehensive income (loss) during period	(123)	12	(223)	156
Ending balance	0	372	0	372
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(998)	(528)	(1,126)	(411)
Current period other comprehensive income (loss) before reclassifications	72	(338)	200	(455)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive income (loss) during period	72	(338)	200	(455)
Ending balance	(926)	(866)	(926)	(866)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(866)	(269)	(909)	(259)
Ending balance	$ (926)	$ (561)	$ (926)	$ (561)

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