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Unconsolidated Affiliates and Noncontrolling Interests (Loans Retired of Unconsolidated Affiliate) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |
Principal Balance Repaid |  | $ 427,247
Gulf Coast Town Center - Phase III |  |
Schedule of Equity Method Investments [Line Items] |  |
Interest Rate at Repayment Date | 3.13% |
Principal Balance Repaid | $ 4,118 |

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