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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS    
Series A Preferred shares, percentage 7.75% 7.75%
Series A Preferred shares, par value (in dollars per share) $ 0.01 $ 0.01
Series A Preferred shares, shares authorized 3,220,000 3,220,000
Series A Preferred shares, shares issued 3,100,000 3,100,000
Series A Preferred shares, shares outstanding 3,100,000 3,100,000
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized 200,000,000 200,000,000
Common shares, shares issued 133,207,939 131,794,547
Common shares, shares outstanding 133,207,939 131,794,547