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, 2010	$ 93,278	$ 32	$ 466,582	$ (392,601)	$ 19,304	$ (39)
Beginning Balance (in shares) at Dec. 31, 2010		32,171
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,909			10,909
Other comprehensive income (loss), translation adjustments	(647)				(647)
Other comprehensive income (loss), pension liability adjustment	0
Purchase of restricted stock from employees		(70)
Purchase of restricted stock from employees	(388)					388
Issuance of shares for 401(k) plan contribution (in shares)	92	92
Issuance of shares for 401(k) plan contribution	602		602			0
Stock-based compensation (in shares)		504
Stock-based compensation	3,603	1	3,602
Ending Balance at Dec. 31, 2011	107,357	33	470,786	(381,692)	18,657	(427)
Ending 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
Stock-based compensation (in shares)		324
Stock-based compensation	2,574	0	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
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