Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	101,430,853	93,658,273
Common stock, shares outstanding (in shares)	97,482,998	89,898,411
Common stock in treasury, shares (in shares)	3,947,855	3,759,862