CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balance at Dec. 31, 2011	$ 107,357	$ 33	$ 470,786	$ (381,692)	$ 18,657	$ (427)
Beginning Balance (in shares) at Dec. 31, 2011		32,697
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,335)			(5,335)
Other comprehensive income (loss), translation adjustments	2,169				2,169
Other comprehensive income (loss), pension liability adjustment	(290)				(290)
Purchase of restricted stock from employees		(124)
Purchase of restricted stock from employees	(600)					(600)
Issuance of shares for 401(k) plan contribution (in shares)	124	124
Issuance of shares for 401(k) plan contribution	666		12			654
Stock-based compensation (in shares)		324
Stock-based compensation	2,574		2,574
Ending Balance at Dec. 31, 2012	106,541	33	473,372	(387,027)	20,536	(373)
Ending Balance (in shares) at Dec. 31, 2012		33,021
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
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 at Dec. 31, 2013	74,385	34	475,461	(417,422)	17,173	(861)
Ending Balance (in shares) at Dec. 31, 2013		33,332
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
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 at Dec. 31, 2014	$ 59,257	$ 34	$ 476,689	$ (430,616)	$ 13,613	$ (463)
Ending Balance (in shares) at Dec. 31, 2014		33,542