Shareholders' Equity - Schedule of Declared Distributions (Details) - $ / shares	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
Dividends paid (in USD per share)	$ 0.40625		$ 0.40625
Series E
Class of Stock [Line Items]
Dividend declared (in USD per share)		$ 0.453125		$ 0.453125
Dividends paid (in USD per share)	$ 0.453125		$ 0.453125