Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 4,763	$ 1,147	$ 5,523	$ 6,431
Other comprehensive income (loss):
Foreign currency exchange translation adjustments	1,130	621	5,209	215
Minimum pension liability, net of tax	(546)	(665)	(1,830)	(1,699)
Other comprehensive income (loss)	584	(44)	3,379	(1,484)
Comprehensive income	$ 5,347	$ 1,103	$ 8,902	$ 4,947