CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common stock	Additional paid in capital	Treasury stock	Accumulated deficit	Other comprehensive income (loss)
Beginning Balance at Dec. 31, 2011	$ 148,624	$ 23	$ 341,352	$ (122,236)	$ (68,759)	$ (1,756)
Beginning Balance (in shares) at Dec. 31, 2011		22,502
Net income (loss)	(3,262)				(3,262)
Change in unrealized gain from hedging activities, net	562					562
Change in unrealized loss from marketable securities, net	1,096					1,096
Change in foreign currency translation adjustments, net	22					22
Purchase of treasury stock (in shares)		(691)
Purchase of treasury stock	(4,443)	(1)		(4,442)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)		228
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan	1,012			2,331	(1,319)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees (in shares)		3
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees				32	(32)
Equity-based compensation	1,486		1,486
Ending Balance at Mar. 31, 2012	145,097	22	342,838	(124,315)	(73,372)	(76)
Ending Balance (in shares) at Mar. 31, 2012		22,042
Beginning Balance at Dec. 31, 2012	142,227	22	346,335	(125,724)	(79,394)	988
Beginning Balance (in shares) at Dec. 31, 2012		21,674
Net income (loss)	1,172				1,172
Change in unrealized gain from hedging activities, net	35					35
Change in unrealized loss from marketable securities, net	200					200
Change in foreign currency translation adjustments, net	(36)					(36)
Change in unrealized gain from pensions, net	3					3
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)		190
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan	845			1,867	(1,022)
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees (in shares)		89
Issuance of treasury stock upon exercise of stock options and stock appreciation rights by employees	237			872	(635)
Equity-based compensation	1,043		1,043
Ending Balance at Mar. 31, 2013	$ 145,726	$ 22	$ 347,378	$ (122,985)	$ (79,879)	$ 1,190
Ending Balance (in shares) at Mar. 31, 2013		21,953