Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 131	$ 2,720	$ 760	$ 5,283
Other comprehensive income (loss):
Foreign currency exchange translation adjustments	2,256	(713)	4,078	(408)
Minimum pension liability, net of tax	(544)	(1,143)	(1,284)	(1,034)
Other comprehensive income (loss)	1,712	(1,856)	2,794	(1,442)
Comprehensive income	$ 1,843	$ 864	$ 3,554	$ 3,841