Consolidated Statements of Stockholders' Investment (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Dec. 31, 2013 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Dec. 31, 2013 Treasury Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2013 Contributed Capital [Member]	Dec. 31, 2012 Contributed Capital [Member]	Dec. 31, 2011 Contributed Capital [Member]	Dec. 31, 2013 Retained Earnings [Member]	Dec. 31, 2012 Retained Earnings [Member]	Dec. 31, 2011 Retained Earnings [Member]	Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member]	Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member]
Balance at beginning of year	$ 25	$ 25	$ 25	$ 25	$ (111,395)	$ (112,910)	$ (114,033)	$ 179,543	$ 177,287	$ 175,610	$ (49,053)	$ (38,720)	$ (31,134)	$ 677	$ 583	$ 662
Foreign currency translation adjustments														(314)	105	(90)
Unrealized investment (loss) gain															(11)	11
Net loss											(1,368)	(8,517)	(6,198)
Shares repurchased					(231)	(301)	(265)
Employee stock plans					1,592	1,816	1,388		196	1	(1,592)	(1,816)	(1,388)
Stock-based compensation								1,247	2,060	1,676
Balance at end of year	$ 25	$ 25	$ 25	$ 25	$ (110,034)	$ (111,395)	$ (112,910)	$ 180,790	$ 179,543	$ 177,287	$ (52,013)	$ (49,053)	$ (38,720)	$ 363	$ 677	$ 583