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, 2012		33,021
Beginning Balance at Dec. 31, 2012	$ 106,541	$ 33	$ 473,372	$ (387,027)	$ 20,536	$ (373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(30,395)			(30,395)
Other comprehensive income (loss), translation adjustments	(3,623)				(3,623)
Other comprehensive income (loss), pension liability adjustment	260				260
Payments for Repurchase of Common Stock	0
Purchase of restricted stock from employees		(132)
Purchase of restricted stock from employees	$ (488)					(488)
Issuance of shares for 401(k) plan contribution (in shares)	0	0
Stock-based compensation (in shares)		443
Stock-based compensation	$ 2,090	$ 1	2,089
Ending Balance (in shares) at Dec. 31, 2013		33,332
Ending Balance at Dec. 31, 2013	74,385	$ 34	475,461	(417,422)	17,173	(861)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,194)			(13,194)
Other comprehensive income (loss), translation adjustments	(3,718)				(3,718)
Other comprehensive income (loss), pension liability adjustment	158				158
Payments for Repurchase of Common Stock	0
Purchase of restricted stock from employees		(36)
Purchase of restricted stock from employees	$ (129)					(129)
Issuance of shares for 401(k) plan contribution (in shares)	118	118
Issuance of shares for 401(k) plan contribution	$ 430		(97)			527
Stock-based compensation (in shares)		128
Stock-based compensation	1,325		1,325
Ending Balance (in shares) at Dec. 31, 2014		33,542
Ending 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)
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	116
Issuance of shares for 401(k) plan contribution	$ 314		(104)			418
Stock-based compensation (in shares)		1,589
Stock-based compensation	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)