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Equity and Capital - Terms and Conditions of Preferred and Common Stock (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 16, 2017 | Jul. 15, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 17, 2017 | Jul. 13, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  | 2016 |  |  |  |
Current Fiscal Year End Date |  |  | --12-31 |  |  |  |
Weighted Average Limited Partnership Units Outstanding, Basic |  |  | 154,170 | 154,170 | 157,950 |  |
General Partners' Capital Account, Units Outstanding |  |  | 104,497,286 | 97,213,000 |  |  |
Partners' Capital Account, Units |  |  | 104,651,456 | 97,367,000 |  |  |
Amount avaiable for issuance |  |  | $ 70,800,000 |  |  |  |
Liquidation preference |  |  |  | $ 325,000,000 |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  | 154,000 | 154,000 |  |  |
Series 6 and Series 7 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 13,000,000 |  |  |
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership |  |  | 99.90% | 99.80% |  |  |
Preferred Stock, Shares Issued |  |  | 13,000,000 | 13,000,000 |  |  |
Preferred stock, liquidation preferences per share |  |  | $ 25 | $ 25 |  |  |
Net proceeds from common stock issuance |  |  | $ 548,920,000 | $ 198,494,000 | $ 102,453,000 |  |
Liquidation preference |  |  | $ 325,000,000 |  |  |  |
Parent Company [Member] | Series 6 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 10,000,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.625% | 6.625% |  |  |
Preferred Stock, Callable Date |  |  | Feb. 16, 2017 | Feb. 16, 2017 |  |  |
Preferred Stock, Shares Issued |  |  | 10,000,000 |  |  |  |
Liquidation preference |  |  | $ 250,000,000 | $ 250,000,000 |  |  |
Parent Company [Member] | Series 7 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,000,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.00% | 6.00% |  |  |
Preferred Stock, Callable Date |  |  | Aug. 23, 2017 | Aug. 23, 2017 |  |  |
Preferred Stock, Shares Issued |  |  | 3,000,000 |  |  |  |
Liquidation preference |  |  | $ 75,000,000 | $ 75,000,000 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Amount avaiable for issuance |  |  | $ 200,000,000 |  |  |  |
Equity Offering, Common Shares available for issue |  |  | 3,100,000 |  |  |  |
Maximum [Member] | Parent Company [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  | $ 75.25 |  |  |  |
Subsequent Event [Member] | Parent Company [Member] | Series 6 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Redemption Date | Feb. 16, 2017 |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  |  |  | $ 25.21 |
Preferred Stock, Redemption Value |  |  |  |  |  | $ 252,000,000 |
Equity Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 5,000,000 |  |  |  |
Shares Issued, Price Per Share |  | $ 79.78 |  |  |  |  |
Net proceeds from common stock issuance |  | $ 400,100,000 |  |  |  |  |
ATM Equity Offering Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 182,787,000 | 189,266,000 |  |  |
Net proceeds from common stock issuance |  |  | $ 12,584,000 | $ 12,843,000 |  |  |
Payments for Commissions |  |  | 157,000 | 161,000 |  |  |
Payments of stock issuance costs |  |  | $ 97,000 | $ 0 |  |  |
Weighted Average Price Per Share |  |  | $ 68.85 | $ 67.86 |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Unsecured Debt Repayment |  |  |  |  |  |  | $ 300,000,000

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