Stockholders’ Equity - Dividends on Preferred Stock (Details) - $ / shares	Jan. 15, 2020	Oct. 15, 2019	Jul. 15, 2019	Apr. 15, 2019	Jan. 15, 2019	Oct. 15, 2018	Jul. 15, 2018	Apr. 15, 2018	Jan. 15, 2018	Oct. 15, 2017	Jul. 15, 2017	Apr. 15, 2017
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	$ 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	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	$ 0.50	$ 0.51
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
Subsequent Event \| Series E Preferred Stock
Dividends Payable [Line Items]
Cash Dividend Per Share (in dollars per share)	$ 0.47578