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 at Dec. 31, 2011	$ 58,998	$ 127	$ (188,389)	$ (308,486)	$ 555,746
Balance, shares at Dec. 31, 2011		12,646
Stockholders' Equity Line Items
Amortization, issuance, and forfeitures of restricted stock grants, shares		503
Amortization, issuance, and forfeitures of restricted stock grants	1,694	5			1,689
Unrealized loss on available-for-sale investments, net of tax	(8,548)		(8,548)
Foreign currency translation adjustment	(938)		(938)
Net income	16,048			16,048
Balance at Jun. 30, 2012	$ 67,254	$ 132	$ (197,875)	$ (292,438)	$ 557,435
Balance, shares at Jun. 30, 2012		13,149