Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Class A Common Stock [Member]
Common stock, par value	$ 1	[1]	$ 1	[2]	$ 1	[1]
Common stock, shares issued (shares)	8,669,439	[1]	8,756,778	[2]	8,756,778	[1]
Common stock, shares outstanding (shares)	8,669,439	[1]	8,756,778	[2]	8,756,778	[1]
Class B Common Stock [Member]
Common stock, par value	$ 1	[1]	$ 1	[2]	$ 1	[1]
Common stock, shares issued (shares)	1,639,812	[1]	1,677,675	[2]	1,677,675	[1]
Common stock, shares outstanding (shares)	1,639,812	[1]	1,677,675	[2]	1,677,675	[1]

[1] Unaudited

[2] Derived from 2010 Annual Report on Form 10-K.