Consolidated Statement Of Shareholders' Equity (USD $) In Thousands	Class A Common Stock [Member]	Class B Common Stock [Member]	Capital In Excess Of Par Value [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Class A Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 288	$ 263	$ 295,576	$ (156,201)	$ (118)	$ (775)	$ 139,033
Balance, shares at Dec. 31, 2010	28,753	26,318				(59)
Comprehensive loss:
Net loss				(19,716)			(19,716)
Other comprehensive loss:
Unrealized loss on securities					(92)		(92)
Total comprehensive loss							(19,808)
Conversion of shares	3	(3)
Conversion of shares, shares	333	(333)
Issuance of shares of stock in conjunction with stock option exercises	3		582				585
Issuance of shares of stock in conjunction with stock option exercises, shares	265
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	1		(74)				(73)
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares	151
Non-cash equity compensation			4,148				4,148
Balance at Sep. 30, 2011	$ 295	$ 260	$ 300,232	$ (175,917)	$ (210)	$ (775)	$ 123,885
Balance, shares at Sep. 30, 2011	29,502	25,985				(59)