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Equity and Capital - Noncontrolling Interest of Limited Partners (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Limited Partners' Capital Account [Line Items] |  |
Preferred Stock, Liquidation Preference, Value |  | $ 325,000,000
Limited Partners' Capital Account, Units Outstanding | 154,000 | 154,000
Partners' Capital Account, Units | 104,651,456 | 97,367,000
General Partners' Capital Account, Units Outstanding | 104,497,286 | 97,213,000
Document Fiscal Year Focus | 2016 |
Parent Company [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Stock Issued During Period, Shares, New Issues |  | 13,000,000
Preferred Stock, Liquidation Preference, Value | $ 325,000,000 |
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership | 99.90% | 99.80%
Noncontrolling Interest in Operating Partnerships | $ (1,967,000) | $ (1,975,000)
Series 7 | Parent Company [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Stock Issued During Period, Shares, New Issues |  | 3,000,000
Preferred Stock, Liquidation Preference, Value | $ 75,000,000 | $ 75,000,000
Preferred Stock, Dividend Rate, Percentage | 6.00% | 6.00%
Preferred Stock, Callable Date | Aug. 23, 2017 | Aug. 23, 2017
Series 6 | Parent Company [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Stock Issued During Period, Shares, New Issues |  | 10,000,000
Preferred Stock, Liquidation Preference, Value | $ 250,000,000 | $ 250,000,000
Preferred Stock, Dividend Rate, Percentage | 6.625% | 6.625%
Preferred Stock, Callable Date | Feb. 16, 2017 | Feb. 16, 2017

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