Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Class A Common Stock
Common stock, par value (in dollars per share)	$ 1	[1]	$ 1	[2]	$ 1	[1]
Common stock, shared authorized	11,000,000	[1]	11,000,000	[2]	11,000,000	[1]
Common stock, shares issued	8,644,307	[1]	8,644,307	[2]	8,756,778	[1]
Common stock, shares outstanding	8,644,307	[1]	8,644,307	[2]	8,756,778	[1]
Class B Common Stock
Common stock, par value (in dollars per share)	$ 1	[1]	$ 1	[2]	$ 1	[1]
Common stock, shared authorized	2,000,000	[1]	2,000,000	[2]	2,000,000	[1]
Common stock, shares issued	1,626,937	[1]	1,639,812	[2]	1,639,987	[1]
Common stock, shares outstanding	1,626,937	[1]	1,639,812	[2]	1,639,987	[1]

[1] Unaudited

[2] Derived from 2011 Annual Report on Form 10-K.