CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 100	$ 100
Preferred stock, shares authorized	100,000	100,000
Preferred stock, issued	11,500	11,500
Preferred stock, redemption value per share (in dollars per share)	$ 10,000	$ 10,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	128,000,000	128,000,000
Common stock, shares issued	55,222,907	55,117,346
Treasury stock, shares	234,253	218,320