Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 11,001	$ 14,678	$ (11,266)
Other comprehensive (loss):
Foreign currency translation adjustments	(847)	(2,664)	(4,150)
Amortization of actuarial gains/losses and other adjustments from pension plan	(1)	(43)	(313)
Total other comprehensive (loss)	(848)	(2,707)	(4,463)
Comprehensive income (loss)	$ 10,153	$ 11,971	$ (15,729)