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Stockholders' Equity and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Income attributable to noncontrolling interests	$ 2,484	$ 2,617	$ 8,530	$ 7,628
Depositary shares outstanding (in shares)	7.2		7.2
6.875 Series C Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
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		$ 25.00
Annual dividend on depositary shares (in usd per share)			$ 1.71875
Series C Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Percentage of redeemable preferred stock			6.875%

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Amount of Income (Loss) attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
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