Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]			$ 179,189
Current period other comprehensive income (loss) before reclassifications		$ 150	$ 401	(94)	$ 772
Reclassification of amounts to earnings		(46)	15	(104)	124
Net other comprehensive income (loss) during period		104	416	(198)	896	[2]
Ending balance		188,866		188,866
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(67)	(36)	(64)	(8)
Current period other comprehensive income (loss) before reclassifications		40	22	37	(6)
Reclassification of amounts to earnings		0	0	0	0
Net other comprehensive income (loss) during period		40	22	37	(6)
Ending balance		(27)	(14)	(27)	(14)
Gain on Derivative Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		372	83	216	(24)
Current period other comprehensive income (loss) before reclassifications		28	8	242	6
Reclassification of amounts to earnings		(46)	15	(104)	124
Net other comprehensive income (loss) during period		(18)	23	138	130
Ending balance		354	106	354	106
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(866)	(784)	(411)	(1,185)
Current period other comprehensive income (loss) before reclassifications		82	371	(373)	772
Reclassification of amounts to earnings		0	0	0	0
Net other comprehensive income (loss) during period		82	371	(373)	772
Ending balance		(784)	(413)	(784)	(413)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(561)	(737)	(259)	(1,217)
Ending balance		$ (457)	$ (321)	$ (457)	$ (321)

[1] See Note 2.

[2] See Note 2.