Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 1	$ 1	$ 1
Common stock, shares outstanding (shares)	99,651,879	100,129,380	103,164,522
Preferred stock, par value (usd per share)
Preferred stock, shares outstanding (shares)	21,588	40,406	82,960