Consolidated Statements of Stockholders' Investment (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance at beginning of year		$ 26,265		$ 31,130	$ 26,265	$ 31,130
Net loss	(5,624)	3,846	(1,652)	2,019	(8,517)	(6,198)	(20,577)
Foreign currency translation adjustments					105	(90)	214
Unrealized investment (loss) gain					(11)	11	(626)
Balance at end of year	19,797		26,265		19,797	26,265	31,130
Common Stock
Balance at beginning of year							25,287,387
Employee stock plans							4,250
Balance at end of year	25,291,637		25,291,637		25,291,637	25,291,637	25,291,637
Balance at beginning of year							25
Balance at end of year	25		25		25	25	25
Common Stock in Treasury
Balance at beginning of year		(6,433,490)		(6,580,272)	(6,433,490)	(6,580,272)	(6,668,202)
Shares repurchased					(57,661)	(34,817)	(22,055)
Employee stock plans					250,018	181,599	109,985
Balance at end of year	(6,241,133)		(6,433,490)		(6,241,133)	(6,433,490)	(6,580,272)
Balance at beginning of year		(112,910)		(114,033)	(112,910)	(114,033)	(114,668)
Shares repurchased					(301)	(265)	(193)
Employee stock plans					1,816	1,388	828
Balance at end of year	(111,395)		(112,910)		(111,395)	(112,910)	(114,033)
Contributed Capital
Balance at beginning of year		177,287		175,610	177,287	175,610	174,325
Employee stock plans					196	1	13
Stock-based compensation					2,060	1,676	1,272
Balance at end of year	179,543		177,287		179,543	177,287	175,610
Retained (Deficit) Earnings
Balance at beginning of year		(38,720)		(31,134)	(38,720)	(31,134)	(9,729)
Net loss					(8,517)	(6,198)	(20,577)
Treasury stock changes					(1,816)	(1,388)	(828)
Balance at end of year	(49,053)		(38,720)		(49,053)	(38,720)	(31,134)
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of year		583		662	583	662	1,074
Foreign currency translation adjustments					105	(90)	214
Unrealized investment (loss) gain					(11)	11	(626)
Balance at end of year	$ 677		$ 583		$ 677	$ 583	$ 662