Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares outstanding	102,683,128	103,270,067	102,632,285
Preferred stock, par value
Preferred stock, shares outstanding	68,049	101,086	128,390