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Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended		9 Months Ended
	Sep. 23, 2019	Sep. 17, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Income attributable to noncontrolling interests			$ (3,102)	$ (3,547)	$ (10,250)	$ (9,265)
Series D Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)			3.0		3.0
Depository shares to cumulative redeemable preferred stock ratio					1.00%
Cumulative redeemable preferred stock liquidation preference (in usd per share)			$ 25.00		$ 25.00
Annual dividend on depositary shares (in usd per share)					$ 1.53125
Percentage of redeemable preferred stock					6.125%
Series C Cumulative Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)			4.2		4.2
Depository shares to cumulative redeemable preferred stock ratio					1.00%
Cumulative redeemable preferred stock liquidation preference (in usd per share)			$ 25.00		$ 25.00
Annual dividend on depositary shares (in usd per share)					$ 1.71875
Percentage of redeemable preferred stock					6.875%
Series E Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)	0.4	4.0
Depository shares to cumulative redeemable preferred stock ratio					1.00%
Cumulative redeemable preferred stock liquidation preference (in usd per share)			$ 25.00		$ 25.00
Annual dividend on depositary shares (in usd per share)					$ 1.50
Percentage of redeemable preferred stock		6.00%			6.00%
Proceeds from shares sold	$ 9,500	$ 96,800

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