Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net Income (loss)	$ (2,817)	$ 806	$ (34,638)
Foreign currency translation adjustment, net of taxes	(2,059)	2,481	(758)
Implementation of accounting standards	(263)
Change in pension loss, net of taxes of $0, $308, and $71, in 2018, 2017 and 2016, respectively	1,387	606	(1,365)
Other comprehensive income (loss)	(935)	3,087	(2,123)
Comprehensive income (loss)	$ (3,752)	$ 3,893	$ (36,761)