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Investments in Unconsolidated Real Estate Joint Ventures - Narrative (Details) ft² in Thousands, $ in Millions |  |  | 1 Months Ended | 5 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) ft² | Dec. 31, 2018 USD ($) ft² | Jun. 30, 2018 USD ($) | Jul. 31, 2017 USD ($) Extension | Nov. 30, 2016 USD ($) Extension | May 31, 2018 USD ($) | Dec. 31, 2017 USD ($) ft² | Jun. 30, 2016 ft² | Mar. 31, 2016 ft² | Jul. 31, 2014 ft² | Nov. 30, 2013 ft² | Oct. 31, 2012 ft²
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Difference in basis | $ |  |  | $ 4.1 |  |  |  |  | $ 4.2 |  |  |  |  |
Charlotte [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 398 |  |  |  |  | 398 |  |  | 398 |  |
Ownership % |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
Columbus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 355 |  |  |  |  | 355 | 355 |  |  |  |
Ownership % |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
Galveston/Houston [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 353 |  |  |  |  | 353 |  |  |  |  | 353
Ownership % |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
National Harbor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 341 |  |  |  |  | 341 |  |  |  | 341 |
Ownership % |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
RioCan Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 924 |  |  |  |  | 923 |  |  |  |  |
Ownership % |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
Ottawa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  |  |  |  |  |  |  |  | 316 |  |  |
Square feet of anchor tenant |  |  |  |  |  |  |  |  |  | 28 |  |  |
Estimated square feet of expansion |  | 39 |  |  |  |  |  |  |  |  |  |  |
Cookstown [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 308 |  |  |  |  |  |  |  |  |  |
Les Factoreries St. Sauveur Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 116 |  |  |  |  |  |  |  |  |  |
Bromont Outlet Mall Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Square Feet |  |  | 161 |  |  |  |  |  |  |  |  |  |
Unconsolidated Properties [Member] | Mortgages [Member] | Charlotte [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal | $ |  |  |  | $ 100.0 |  |  | $ 90.0 |  |  |  |  |  |
Stated Interest Rate(s) |  |  |  | 4.30% |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.45% |  |  |  |  |  |
Proceeds from joint venture debt | $ |  |  |  | $ 9.3 |  |  |  |  |  |  |  |  |
Unconsolidated Properties [Member] | Mortgages [Member] | Columbus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal | $ |  |  |  |  |  | $ 85.0 |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.65% |  |  |  |  |  |  |
Number of mortgage extensions | Extension |  |  |  |  |  | 2 |  |  |  |  |  |  |
Term of debt extension |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Proceeds from joint venture debt | $ |  |  |  |  |  | $ 84.2 |  |  |  |  |  |  |
Unconsolidated Properties [Member] | Mortgages [Member] | Galveston/Houston [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal | $ |  | $ 65.0 |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.50% |  |  | 1.65% |  |  |  |  |  |  |  |
Number of mortgage extensions | Extension |  |  |  |  | 2 |  |  |  |  |  |  |  |
Term of debt extension |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Proceeds from joint venture debt | $ |  |  |  |  | $ 14.5 |  |  |  |  |  |  |  |
Borrowing capacity | $ |  | $ 70.0 |  |  | $ 80.0 |  |  |  |  |  |  |  |
Unconsolidated Properties [Member] | National Harbor [Member] | Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal | $ | $ 87.0 |  | $ 95.0 |  |  |  |  |  |  |  |  |  |
Stated Interest Rate(s) |  |  | 4.60% |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.65% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from joint venture debt | $ |  |  | $ 7.4 |  |  |  |  |  |  |  |  |  |

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