Unaudited Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Shares Outstanding Class A
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares outstanding	5,574,814	5,662,214	6,218,289
Shares Outstanding Class B
Common stock, par value	$ 1	$ 1	$ 1
Common stock, convertible conversion ratio	1	1	1
Common stock, shares outstanding	1,572,647	1,573,292	1,580,870