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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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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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