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Preferred Stock (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2014 USD ($) shares | May. 31, 2013 USD ($) $ / shares shares | Feb. 29, 2012 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) | Oct. 31, 2006
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock issuance costs | $ | $ 8,488 |  |  | $ 4,178 | $ 10,683 | $ 3,774 |
Underwriters over allotment of shares (in shares) | shares | 712,500 |  |  |  |  |  |
Redemption price per share (in dollars per share) | $ / shares |  |  |  | $ 2,500.00 |  |  |
Stated liquidation value per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |  |
Series D Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend rate |  |  | 6.625% | 6.625% | 6.625% |  |
Depositary shares outstanding (in shares) | shares |  |  | 11,500,000 | 115,000 | 115,000 |  |
Gross Proceeds | $ |  |  | $ 287,500 |  |  |  |
Stock issuance costs | $ |  |  | $ 9,855 |  |  |  |
Dividend per depositary share (in dollars per share) | $ / shares |  |  | $ 1.656250 |  |  |  |
Ratio of depositary share to underlying preferred stock |  |  |  |  |  |  | 0.01
Underwriters over allotment of shares (in shares) | shares |  |  |  | 1,500,000 |  |  |
Series E Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend rate |  | 5.70% |  | 5.70% | 5.70% |  |
Depositary shares outstanding (in shares) | shares |  | 11,500,000 |  | 115,000 | 115,000 |  |
Gross Proceeds | $ |  | $ 287,500 |  | $ 0 | $ 0 | $ 287,500 |
Stock issuance costs | $ |  | $ 9,856 |  |  |  |  |
Dividend per depositary share (in dollars per share) | $ / shares |  | $ 1.425000 |  |  |  |  |
Ratio of depositary share to underlying preferred stock |  |  |  | 0.01 |  |  |
Underwriters over allotment of shares (in shares) | shares |  |  |  | 1,500,000 |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + 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 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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