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Preferred Stock (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Oct. 31, 2016 USD ($) $ / shares shares | Nov. 30, 2014 USD ($) shares | May 31, 2013 USD ($) $ / shares shares | Feb. 29, 2012 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) | Feb. 23, 2017 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | $ |  |  |  |  | $ 8,488 |  |  |  |  | $ 4,266 | $ 4,178 | $ 10,683 |
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 (percent) |  |  |  |  |  |  |  | 6.625% | [1] | 6.625% | 6.625% |  |
Depositary shares issued (in shares) | shares |  |  |  |  |  |  |  | 11,500,000 | [2] | 115,000 | 115,000 |  |
Gross Proceeds | $ |  |  |  |  |  |  |  | $ 287,500 |  |  |  |  |
Stock issuance costs | $ | [3] |  |  |  |  |  |  | $ 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 (percent) |  |  |  |  |  | 5.70% | [1] |  |  | 5.70% | 5.70% |  |
Depositary shares issued (in shares) | shares |  |  |  |  |  | 11,500,000 | [2] |  |  | 115,000 | 115,000 |  |
Gross Proceeds | $ |  |  |  |  |  | $ 287,500 |  |  |  |  |  |  |
Stock issuance costs | $ | [3] |  |  |  |  | $ 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 |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (percent) |  |  | 5.20% | [1] |  |  |  |  |  | 5.20% | 0.00% |  |
Depositary shares issued (in shares) | shares |  |  | 13,800,000 | [2] |  |  |  |  |  | 138,000 | 0 |  |
Gross Proceeds | $ |  |  | $ 345,000 |  |  |  |  |  |  | $ 345,000 | $ 0 | $ 0 |
Stock issuance costs | $ | [3] |  | $ 10,897 |  |  |  |  |  |  |  |  |  |
Dividend per depositary share (in dollars per share) | $ / shares |  |  | $ 1.30 |  |  |  |  |  |  |  |  |  |
Ratio of depositary share to underlying preferred stock |  |  |  |  |  |  |  |  |  | 0.01 |  |  |
Underwriters over allotment of shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |
Scenario, Forecast | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated liquidation value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00
Aggregate redemption price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.3128472
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (percent) | [1] | 6.625% |  |  |  |  |  |  |  |  |  |  |
[1] | Holders are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends.
[2] | Representing 1/100th of a preferred share. Series D and E issuances each included 1,500,000 depositary shares in connection with the underwriters' over-allotment.
[3] | Consisting primarily of underwriting commissions and fees, rating agency fees, legal and accounting fees and printing expenses.

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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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