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Preferred Stock (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 $ / shares shares | Oct. 31, 2016 USD ($) $ / shares shares | May 31, 2013 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |
Stock Issuance Costs | $ |  |  |  | $ 3,782 | $ 4,266 | $ 4,178
Ratio of depositary share to underlying preferred stock |  |  |  | 0.01 |  |
Redemption price per share (in dollars per share) | $ / shares |  |  |  | $ 2,500.00 |  |
Stated liquidation value per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |
Preferred stock, shares redeemed (in shares) | shares | 11,500,000 |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividend Rate (percent) |  |  | 5.70% | 5.70% | 5.70% |
Preferred shares issued (in shares) | shares |  |  | 11,500,000 | 115,000 | 115,000 |
Gross Proceeds | $ |  |  | $ 287,500 |  |  |
Stock Issuance Costs | $ |  |  | $ 9,856 |  |  |
Dividend Per Depositary Share (in dollars per share) | $ / shares |  |  | $ 1.425000 |  |  |
Underwriters over allotment of shares (in shares) | shares |  |  |  | 1,500,000 |  |
Series F Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividend Rate (percent) |  | 5.20% |  | 5.20% | 5.20% |
Preferred shares issued (in shares) | shares |  | 13,800,000 |  | 138,000 | 138,000 |
Gross Proceeds | $ |  | $ 345,000 |  | $ 0 | $ 345,000 | 0
Stock Issuance Costs | $ |  | $ 10,897 |  |  |  |
Dividend Per Depositary Share (in dollars per share) | $ / shares |  | $ 1.30 |  |  |  |
Underwriters over allotment of shares (in shares) | shares |  |  |  | 1,800,000 |  |
Series D Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividend Rate (percent) | 6.625% |  |  |  | 6.625% |
Preferred shares issued (in shares) | shares |  |  |  |  | 115,000 |
Stated liquidation value per share (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |
Aggregate redemption price (in USD per share) | $ / shares | $ 25.3128472 |  |  |  |  |
Excess of redemption value over carrying value of Series D preferred shares redeemed | $ |  |  |  | $ 9,855 | $ 0 | $ 0

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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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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=84159872&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=84159872&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=84159872&loc=d3e21488-112644 + Details
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