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Stockholders' Equity - Preferred Stock (Details) - $ / shares | Dec. 12, 2016 | Sep. 14, 2016 | Jun. 17, 2016 | Mar. 15, 2016 | Dec. 14, 2015 | Sep. 09, 2015 | Jun. 09, 2015 | Mar. 16, 2015
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Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Amount | $ 0.5391 | $ 0.5391 | $ 0.5391 |  | $ 0.5391 | $ 0.5391 | $ 0.5391 | $ 0.5391
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividend Amount | $ 0.5000 | $ 0.5000 | $ 0.5000 | $ 0.50 | $ 0.6333 |  |  |

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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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