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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Common shares, par value $ 0.10 $ 0.10
Common shares, shares authorized 600,000,000 500,000,000
Common shares, shares issued 320,055,468 315,239,299
Treasury at cost 849,960 977,673
Class H Preferred Shares [Member]
    
Cumulative redeemable preferred shares, liquidation value $ 500 $ 500
Cumulative redeemable preferred shares, shares authorized 750,000 750,000
Cumulative redeemable preferred shares, shares issued 110,000 410,000
Cumulative redeemable preferred shares, shares outstanding 110,000 410,000
Preferred stock dividend rate 7.375% 7.375%
Cumulative redeemable preferred shares, par value      
Class J Preferred Shares [Member]
    
Cumulative redeemable preferred shares, liquidation value $ 500 $ 500
Cumulative redeemable preferred shares, shares authorized 750,000 750,000
Cumulative redeemable preferred shares, shares issued 400,000 400,000
Cumulative redeemable preferred shares, shares outstanding 400,000 400,000
Preferred stock dividend rate 6.50% 6.50%
Cumulative redeemable preferred shares, par value      
Class K Preferred Shares [Member]
    
Cumulative redeemable preferred shares, liquidation value $ 500  
Cumulative redeemable preferred shares, shares authorized 750,000  
Cumulative redeemable preferred shares, shares issued 300,000  
Cumulative redeemable preferred shares, shares outstanding 300,000  
Preferred stock dividend rate 6.25%  
Cumulative redeemable preferred shares, par value