Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Capital in Excess of Par Value [Member]
Balance Amount at beginning of period at Dec. 31, 2011	$ 58,998	$ 127	$ (188,389)	$ (308,486)	$ 555,746
Share Balance at beginning of period at Dec. 31, 2011		12,646
Stockholders' Equity Line Items
Amortization, issuance, and forfeitures of restricted stock grants, shares		485
Amortization, issuance, and forfeitures of restricted stock grants	422	4			418
Unrealized loss on available-for-sale investments, net of tax	(57)		(57)
Foreign currency translation adjustment	(94)		(94)
Net income	5,097			5,097
Balance Amount at end of period at Mar. 31, 2012	$ 64,366	$ 131	$ (188,540)	$ (303,389)	$ 556,164
Share Balance at end of period at Mar. 31, 2012		13,131