CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 1.00
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	13,900,000	13,900,000
Preferred stock, shares outstanding (in shares)	13,900,000	13,900,000
Common stock, par value (in dollars per share)	$ 0.01	$ 1.00
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	133,202,323	118,058,988
Common stock, shares outstanding (in shares)	133,202,323	118,058,988