v2.3.0.15
Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Preferred shares  
Preferred shares, par value$ 0.01$ 0.01
Preferred shares, authorized250,000,000250,000,000
Preferred shares, issued00
Common shares  
Common shares, par value$ 0.01$ 0.01
Common shares, authorized500,000,000500,000,000
Common shares, issued221,995,792220,916,960
Common shares, outstanding221,995,792220,916,960