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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares | Sep. 13, 2021 | Jun. 14, 2021 | Mar. 15, 2021 | Dec. 07, 2020 | Sep. 14, 2020 | Jun. 15, 2020
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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 | $ 0.968750
Series C Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividend per share (in dollars per share) | 0 | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875 | 0.9843750
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 | 1.00
Series E Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividend per share (in dollars per share) | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875 | 0.4921875 | 0.9843750
Series F Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividend per share (in dollars per share) | $ 0.4679 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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