CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balance (in shares) at Dec. 31, 2014		33,542
Beginning Balance at Dec. 31, 2014	$ 59,257	$ 34	$ 476,689	$ (430,616)	$ 13,613	$ (463)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,329			2,329
Other comprehensive income (loss), translation adjustments	(3,326)				(3,326)
Other comprehensive income (loss), pension liability adjustment	5				5
Stock Repurchased During Period, Shares		(528)
Payments for Repurchase of Common Stock	(1,386)					(1,386)
Purchase of restricted stock from employees		(108)
Purchase of restricted stock from employees	(244)					(244)
Issuance of shares for 401(k) plan contribution (in shares)		116
Issuance of shares for 401(k) plan contribution	314		(104)			418
Stock-based compensation (in shares)		1,589
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	4,231		4,231
Ending Balance (in shares) at Dec. 31, 2015		34,611
Ending Balance at Dec. 31, 2015	61,180	$ 34	480,816	(428,287)	10,292	(1,675)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,790)			(8,790)
Other comprehensive income (loss), translation adjustments	(3,333)				(3,333)
Other comprehensive income (loss), pension liability adjustment	(28)				(28)
Dividends, Common Stock, Cash				(3,401)
Stock Repurchased During Period, Shares		(2,461)
Payments for Repurchase of Common Stock	(5,127)					(5,127)
Purchase of restricted stock from employees		(35)
Purchase of restricted stock from employees	(65)					(65)
Stock-based compensation (in shares)		(350)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,449		1,449
Ending Balance (in shares) at Dec. 31, 2016		31,765
Ending Balance at Dec. 31, 2016	41,885	$ 34	482,265	(440,478)	6,931	(6,867)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,941)			(2,941)
Other comprehensive income (loss), translation adjustments	3,844				3,844
Other comprehensive income (loss), pension liability adjustment	(66)				(66)
Stock Repurchased During Period, Shares		(650)
Payments for Repurchase of Common Stock	(858)					(858)
Purchase of restricted stock from employees		(5)
Purchase of restricted stock from employees	(5)					(5)
Stock-based compensation (in shares)		49
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,293		1,293
Ending Balance (in shares) at Dec. 31, 2017		31,159
Ending Balance at Dec. 31, 2017	$ 43,152	$ 34	$ 483,558	$ (443,419)	$ 10,709	$ (7,730)