Consolidated Statement of Shareholders' Equity (USD $) In Thousands	Total	Capital in Excess of Par Value [Member]	Accumulated deficit [Member]	Accumulated other comprehensive loss [Member]	Class A Treasury Stock [Member]	Class A Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]
Balance at Dec. 31, 2012	$ 95,516	$ 340,586	$ (244,529)	$ (438)	$ (775)	$ 412	$ 260
Balance, shares at Dec. 31, 2012					(59)	41,221	25,985
Net loss	(8,748)		(8,748)
Other comprehensive income	24			24
Issuance of shares of stock in conjunction with stock option exercises	60	60
Issuance of shares of stock in conjunction with stock option exercises, shares						31
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	(443)	(447)				4
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares						348
Non-cash equity compensation	1,356	1,356
Balance at Sep. 30, 2013	$ 87,765	$ 341,555	$ (253,277)	$ (414)	$ (775)	$ 416	$ 260
Balance, shares at Sep. 30, 2013					(59)	41,600	25,985