Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 94,916	$ 185,590	$ 182,596	$ 179,189
Current period other comprehensive income (loss) before reclassifications	(177)	150	(86)	(94)
Amounts reclassified from accumulated other comprehensive loss		(46)	(108)	(104)
Net other comprehensive income (loss) during period	(177)	104	(194)	(198)	[1]
Ending balance	84,462	188,866	84,462	188,866
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	(67)	(6)	(64)
Current period other comprehensive income (loss) before reclassifications		40	19	37
Amounts reclassified from accumulated other comprehensive loss		0	(13)	0
Net other comprehensive income (loss) during period	0	40	6	37
Ending balance	0	(27)	0	(27)
Gain (Loss) on Derivative Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	372	223	216
Current period other comprehensive income (loss) before reclassifications		28	(128)	242
Amounts reclassified from accumulated other comprehensive loss		(46)	(95)	(104)
Net other comprehensive income (loss) during period	0	(18)	(223)	138
Ending balance	0	354	0	354
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(926)	(866)	(1,126)	(411)
Current period other comprehensive income (loss) before reclassifications	(177)	82	23	(373)
Amounts reclassified from accumulated other comprehensive loss		0	0	0
Net other comprehensive income (loss) during period	(177)	82	23	(373)
Ending balance	(1,103)	(784)	(1,103)	(784)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(926)	(561)	(909)	(259)
Ending balance	$ (1,103)	$ (457)	$ (1,103)	$ (457)

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