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Stockholders' Equity and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Class of Stock [Line Items]
Income attributable to noncontrolling interests	$ 3,670	$ 3,426
Depositary shares outstanding (in shares)	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
Annual dividend on depositary shares (in usd per share)	$ 1.71875

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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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-Publisher FASB
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