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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | May 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Differences in basis |  | $ 4,100 |  |  | $ 4,100 |  | $ 4,200
Unconsolidated Properties [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Asset impairment |  | $ 0 | $ 18,042 |  | $ 0 | $ 18,042 |
Unconsolidated Properties [Member] | Charlotte [Member] | Mortgages [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Principal | $ 100,000 |  |  | $ 90,000 |  |  |
Interest rate | 4.30% |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.45% |  |  |
Net loan proceeds | $ 9,300 |  |  |  |  |  |
Unconsolidated Properties [Member] | Bromont and Les Factories St. Sauveur [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Asset impairment |  |  | 18,000 |  |  |  |
Our share of impairment charge |  |  | $ 9,000 |  |  |  |

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