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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended
	Feb. 22, 2018	Jan. 23, 2018	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Income attributable to noncontrolling interests			$ 2,359	$ 3,670
Series C Cumulative Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)			4.2
Depository shares to cumulative redeemable preferred stock ratio			1.00%
Percentage of redeemable preferred stock			6.875%
Cumulative redeemable preferred stock liquidation preference (in usd per share)			$ 25.00
Depositary shares redeemed during period (in shares)	3.0
Annual dividend on depositary shares (in usd per share)			$ 1.71875
Series D Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)		3.0
Net proceeds from shares sold		$ 72,600
Depository shares to cumulative redeemable preferred stock ratio			1.00%
Percentage of redeemable preferred stock		6.125%
Cumulative redeemable preferred stock liquidation preference (in usd per share)		$ 25.00
Annual dividend on depositary shares (in usd per share)		$ 1.53125

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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