Unaudited Condensed Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares	Sep. 30, 2014 $ / shares shares
Shares Outstanding Class A
Common stock, par value | $ / shares	$ 1	$ 1	$ 1
Common stock, shares outstanding	5,276,963	5,662,214	5,821,078
Shares Outstanding Class B
Common stock, par value | $ / shares	$ 1	$ 1	$ 1
Common stock, convertible conversion ratio	1	1	1
Common stock, shares outstanding	1,572,027	1,573,292	1,573,804