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Subsequent Events Preferred Shares Redemption (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2017 | Jan. 31, 2017 | Feb. 29, 2012 | [1] | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 13, 2017 | Oct. 31, 2015 | May 31, 2014 | Apr. 30, 2013
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stated liquidation value per share (in dollars per share) |  |  |  |  | $ 25.00 |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate (percent) |  |  |  | 6.625% | 6.625% | 6.625% |  |  |  |
Series D Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate (percent) | [1] |  | 6.625% |  |  |  |  |  |  |
Scenario, Forecast | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stated liquidation value per share (in dollars per share) |  | $ 25.00 |  |  |  |  |  |  |  |
Aggregate redemption price (in USD per share) |  | $ 25.3128472 |  |  |  |  |  |  |  |
Preferred stock redemption discount |  | $ 9,855,000 |  |  |  |  |  |  |  |
Forward Swap |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 180,000,000 |  |  | $ 300,000,000 | $ 225,000,000 | $ 240,000,000
Forward Swap | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 125,000,000 |  |  |
[1] | Holders are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Preferred Stock, Redemption Price Including Accrued Dividends + References No definition available. + Details
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- Definition Preferred Stock, Redemption Price Per Depository Share + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share. + 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 Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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