Condensed Consolidated Statement of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Class A Common Stock	Class B Convertible Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock	Total
Shareholders' equity at Dec. 31, 2010	$ 160	$ 80	$ 110,847	$ (592)	$ 161,161	$ (124,921)	$ 146,735
Shareholders' equity (in shares) at Dec. 31, 2010	16,070,348	8,010,497				(5,855,550)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss					(10,865)		(10,865)
Other-than-temporary impairment for non-credit component of available-for-sale securities				(34)			(34)
Translation adjustment for foreign currency				(78)			(78)
Unrealized loss on available-for-sale securities				(92)			(92)
Comprehensive loss							(11,069)
Realized loss for non-credit component of impaired securities				81			81
Stock-based compensation expense			2,695				2,695
Exercise of stock options and related taxes	1		642				643
Exercise of stock options and related taxes (in shares)	73,617
Issuance of restricted stock	1						1
Issuance of restricted stock (in shares)	129,970
Shares surrendered by employees to pay taxes on restricted stock			(575)				(575)
Shares surrendered by employees to pay taxes on restricted stock (in shares)	(43,460)
Issuance of Class A Common Stock for Employee Stock Purchase Plan			69				69
Issuance of Class A Common Stock for Employee Stock Purchase Plan (in shares)	6,415
Repurchase of treasury shares						(2,872)	(2,872)
Repurchase of treasury shares (in shares)						(246,300)
Dividends associated with vesting of restricted stock					(12)		(12)
Shareholders' equity at Sep. 30, 2011	$ 162	$ 80	$ 113,678	$ (715)	$ 150,284	$ (127,793)	$ 135,696
Shareholders' equity (in shares) at Sep. 30, 2011	16,236,890	8,010,497				(6,101,850)