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.

No definition available.

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

Shareholders' Equity - Schedule of Declared Distributions (Details) - Series D - $ / shares	Nov. 15, 2018	Oct. 29, 2018	Aug. 15, 2018	Jul. 30, 2018	May 15, 2018	Apr. 27, 2018	Feb. 15, 2018	Jan. 30, 2018
Class of Stock [Line Items]
Dividend declared (in dollars per share)		$ 0.40625		$ 0.40625		$ 0.40625		$ 0.40625
Dividends paid (in dollars per share)	$ 0.40625		$ 0.40625		$ 0.40625		$ 0.40625