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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares | Oct. 15, 2019 | Jul. 15, 2019 | Apr. 15, 2019 | Jan. 15, 2019 | Oct. 15, 2018 | Jul. 15, 2018 | Apr. 15, 2018
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Series B Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) |  | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375
Series C Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) |  | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875
Series D Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) |  | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50
Subsequent Event | Series B Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | $ 0.484375 |  |  |  |  |  |
Subsequent Event | Series C Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | 0.4921875 |  |  |  |  |  |
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | $ 0.50 |  |  |  |  |  |

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