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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
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
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
Series D Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.5	$ 0.5	$ 0.5	$ 0.5	$ 0.50

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