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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Series B Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375	$ 0.484375
Series C Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share	0.4921875	0.4921875	0.4921875	0.4921875	0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875	$ 0.4921875
Series D Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share	$ 0.5	$ 0.5	$ 0.5	$ 0.50	$ 0.51111

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