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Common and Preferred Shares Preferred Shares (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 12, 2012 | Apr. 02, 2008 | Dec. 22, 2006 | Dec. 31, 2015 | Dec. 31, 2014
Series C Preferred Shares [Member] |  |  |  |  |
Schedule of Preferred Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 5,400,000 | 5,400,000 | 5,400,000
Preferred share dividend percentage |  |  | 5.75% | 5.75% |
Preferred share dividend rate (in dollars per share) |  |  |  | $ 1.4375 |
Per share liquidation preference |  |  |  | 25 |
Preferred shares conversion rate |  |  |  | 0.3758 |
Preferred shares conversion price |  |  |  | 66.52 |
Common shares quarterly dividend per share threshold, minimum |  |  |  | $ 0.6875 |
Common share closing price percent of preferred share prevailing conversion price, minimum |  |  |  | 135.00% |
Preferred Shares declared dividends per share |  |  |  | $ 1.4375 | $ 1.4375
Preferred Stock, Dividends, Per Share, Cash Paid |  |  |  | $ 1.4375 |
Series E Preferred Shares [Member] |  |  |  |  |
Schedule of Preferred Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued |  | 3,500,000 |  | 3,450,000 | 3,450,000
Preferred share dividend percentage |  | 9.00% |  | 9.00% |
Preferred share dividend rate (in dollars per share) |  |  |  | $ 2.25 |
Per share liquidation preference |  |  |  | 25 |
Preferred shares conversion rate |  |  |  | 0.4573 |
Preferred shares conversion price |  |  |  | 54.67 |
Common shares quarterly dividend per share threshold, minimum |  |  |  | $ 0.84 |
Common share closing price percent of preferred share prevailing conversion price, minimum |  |  |  | 150.00% |
Preferred Shares declared dividends per share |  |  |  | $ 2.25 | $ 2.25
Series F Preferred Stock [Member] |  |  |  |  |
Schedule of Preferred Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued | 5,000,000 |  |  |  |
Preferred share dividend percentage | 6.625% |  |  | 6.625% |
Preferred share dividend rate (in dollars per share) |  |  |  | $ 1.65625 |
Per share liquidation preference |  |  |  | 25.00 |
Preferred Shares declared dividends per share |  |  |  | 1.65625 | $ 1.65625
Preferred Stock, Dividends, Per Share, Cash Paid |  |  |  | $ 1.65625 |

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