Condensed Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheet [Abstract]
Accounts receivable, allowance for doubtful amounts	$ 2,837	$ 2,510
Fixed assets, accumulated depreciation	$ 58,260	$ 49,556
Class A stock, par value	$ 1	$ 1
Class A stock, shares authorized	100,000,000	100,000,000
Class A stock, shares issued	3,163,866	3,163,866
Class A stock, shares outstanding	2,806,688	2,806,688
Treasury stock, shares	357,181	357,181