Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Class A Common Stock	Class B Common Stock	Capital in Excess of Par Value [Member]	Accumulated deficit [Member]	Total Accumulated Other Comprehensive Loss	Class A Treasury Stock [Member]	Class A Common Stock Common Stock [Member]	Class B Common Stock Common Stock [Member]
Beginning Balance at Dec. 31, 2011	$ 147,947	$ 409	$ 260	$ 336,661	$ (188,442)	$ (166)	$ (775)
Balance, Shares at Dec. 31, 2011		40,954,000	25,985,000				59,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(56,085)				(56,085)
Other comprehensive loss	(272)					(272)
Issuance of shares of stock in conjunction with stock option exercises	153	1		152
Issuance of shares of stock in conjunction with stock option exercise, shares		78,000
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	(157)	2		(159)
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares		189,000
Common stock dividends	(2)				(2)
Non-cash equity compensation	3,932			3,932
Ending Balance at Dec. 31, 2012	95,516	412	260	340,586	(244,529)	(438)	(775)
Balance, shares at Dec. 31, 2012		41,221,000	25,985,000				59,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,772)				(1,772)
Other comprehensive loss	(41)					(41)
Issuance of shares of stock in conjunction with stock option exercises	116	1		115
Issuance of shares of stock in conjunction with stock option exercise, shares		60,000
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	(463)	4		(467)
Stock returned and retired during period, value		110			24,750
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares		(424,000)
Issuance of shares of stock in connection with equity sale, net of expenses		(110)
Issuance of shares of stock in connection with equity sale, net of expenses, shares		(11,000,000)
Common stock dividends	(24,860)				(24,750)
Non-cash equity compensation	1,979			1,979
Ending Balance at Dec. 31, 2013	70,475	307	260	342,213	(271,051)	(479)	(775)
Balance, shares at Dec. 31, 2013		30,705,000	25,985,000				59,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,058)				(5,058)
Other comprehensive loss	455					455
Stock Issued During Period, Shares, Conversion of Convertible Securities								1,000,000	(1,000,000)
Stock Issued During Period, Value, Conversion of Convertible Securities								10	(10)
Issuance of shares of stock in conjunction with stock option exercises	985	3		982
Issuance of shares of stock in conjunction with stock option exercise, shares		301,000
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings	(285)	2		(287)
Issuance of shares of stock and restricted stock, net of cancellations and tax withholdings, shares		(255,000)
Non-cash equity compensation	2,113			2,113
Ending Balance at Dec. 31, 2014	$ 68,685	$ 322	$ 250	$ 345,021	$ (276,109)	$ (24)	$ (775)
Balance, shares at Dec. 31, 2014		32,261,000	24,985,000				59,000