Shareholders' Equity - Schedule of Declared Distributions (Details) - $ / shares	Nov. 15, 2016	Oct. 10, 2016	Aug. 15, 2016	Jul. 11, 2016	May 16, 2016	Apr. 15, 2016	Feb. 16, 2016	Jan. 26, 2016
Series D
Class of Stock [Line Items]
Dividend declared (in USD per share)				$ 0.40625		$ 0.40625		$ 0.40625
Dividend paid (in USD per share)			$ 0.40625		$ 0.40625		$ 0.40625
Series E
Class of Stock [Line Items]
Dividend declared (in USD per share)				$ 0		$ 0.453125		$ 0.453125
Dividend paid (in USD per share)			$ 0		$ 0.453125		$ 0.453125
Subsequent event | Series D
Class of Stock [Line Items]
Dividend declared (in USD per share)		$ 0.40625
Dividend paid (in USD per share)	$ 0.40625
Subsequent event | Series E
Class of Stock [Line Items]
Dividend declared (in USD per share)		$ 0
Dividend paid (in USD per share)	$ 0