Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Shareholders' Equity - Schedule of Declared Distributions (Details) - $ / shares	Oct. 09, 2015	Jul. 09, 2015	Apr. 08, 2015	Jan. 16, 2015
Series D
Class of Stock [Line Items]
Dividend declared (in dollars per share)	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.40625
Series E
Class of Stock [Line Items]
Dividend declared (in dollars per share)	$ 0.453125	$ 0.453125	$ 0.453125	$ 0.453125