Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
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	8,586,058	[1]	8,588,031	[2]	8,644,307	[1]
Common stock, shares outstanding	8,586,058	[1]	8,588,031	[2]	8,644,307	[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	1,032,883	[1]	1,032,883	[2]	1,626,937	[1]
Common stock, shares outstanding	1,032,883	[1]	1,032,883	[2]	1,626,937	[1]

[1] Unaudited

[2] Derived from 2012 Annual Report on Form 10-K.