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Unconsolidated Affiliates and Noncontrolling Interests (Loan Activity of Unconsolidated Affiliate) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |
Principal payments in 2018 |  | $ 667,320
Principal payments in 2019 |  | 329,846
Principal payments in 2020 |  | $ 551,004
Ambassador Infrastructure, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage guaranteed by the operating partnership | 100.00% | 100.00%
Ambassador Infrastructure, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Amount Extended | $ 11,035 |
Principal payments in 2018 | 430 |
Principal payments in 2019 | 555 |
Principal payments in 2020 | $ 690 |
Ambassador Infrastructure, LLC | Interest Rate Swap |  |
Schedule of Equity Method Investments [Line Items] |  |
Notional amount of the loan |  | $ 9,360
Fixed interest rate |  | 3.74%
Ambassador Infrastructure, LLC | LIBOR |  |
Schedule of Equity Method Investments [Line Items] |  |
Stated Interest Rate | 2.00% |

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