Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011
Stockholders' equity and noncontrolling interest:
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	641,702,178
Common stock, shares issued (in shares)	33,381,506
Common stock, shares outstanding (in shares)	31,324,808
4.875% Series G Cumulative Convertible Preferred Stock [Member]
Stockholders' equity and noncontrolling interest:
Cumulative convertible preferred stock, par value (in dollars per share)	$ 0.0001
Cumulative convertible preferred stock, shares issued (in shares)	5,980,000
Cumulative convertible preferred stock, shares outstanding (in shares)	178,249