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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares	Jan. 15, 2020	Oct. 15, 2019	Jul. 15, 2019	Apr. 15, 2019
Series B Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 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
Series D Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	0.50	$ 0.50	$ 0.50	$ 0.50
Series E Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.47578

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