Shareholders' Equity - Schedule of Declared Distributions (Details) - Series D - $ / shares	Nov. 15, 2017	Oct. 12, 2017	Aug. 15, 2017	Jun. 30, 2017	May 15, 2017	Apr. 10, 2017	Feb. 15, 2017	Jan. 12, 2017
Class of Stock [Line Items]
Dividend declared (in dollars per share)				$ 0.40625		$ 0.40625		$ 0.40625
Dividend paid (in dollars per share)			$ 0.40625		$ 0.40625		$ 0.40625
Scenario, Forecast
Class of Stock [Line Items]
Dividend paid (in dollars per share)	$ 0.40625
Subsequent event
Class of Stock [Line Items]
Dividend declared (in dollars per share)		$ 0.40625