Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance for accounts receivable	$ 577	$ 794
Accumulated amortization on other intangibles, deferred costs and investments	$ 11,984	$ 11,702
Preferred stock, shares authorized (in shares)	1,500	1,500
Treasury stock, shares (in shares)	1,491	1,488
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	35,000	35,000
Common Stock, shares issued (in shares)	6,369	6,369
Class B Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	3,500	3,500
Common Stock, shares issued (in shares)	797	797
Common Stock, shares outstanding (in shares)	797	797