Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Allowance for accounts receivable	$ 794	$ 797
Accumulated amortization on other intangibles, deferred costs and investments	$ 11,756	$ 14,662
Preferred stock, shares authorized	1,500	1,500
Preferred stock, shares issued
Preferred stock, shares outstanding
Treasury stock, shares	1,116	1,112
Class A Common Stock
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	35,000	35,000
Common Stock, shares issued	4,771	4,770
Class B Common Stock
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	3,500	3,500
Common Stock, shares issued	597	598
Common Stock, shares outstanding	597	598