CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	1,400,000	1,400,000
Preferred stock, shares outstanding	1,400,000	1,400,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	66,340,695	66,317,049
Less: Grantor Stock Trust held at market value, shares	0	291,341
Less: Common stock held in treasury, shares	1,453,819	1,910,646