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Investments in Unconsolidated Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details) ft² in Thousands, $ in Thousands | Sep. 30, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft²
--- | --- | ---
National Harbor and RioCan Canada [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment | $ 111,300 |
National Harbor [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Square Feet | ft² | 341 | 341
Carrying Value of Investment | $ 600 | $ 2,500
RioCan Canda [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Square Feet | ft² | 923 | 923
Carrying Value of Investment | $ 110,700 | $ 115,800
Columbus National Harbor RioCan Canada [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value of Investment |  | $ 119,400
Columbus, Charlotte and Galveston/Houston [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment Reported In Liabilities | $ (26,700) |
Columbus [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Square Feet | ft² | 355 | 355
Carrying Value of Investment |  | $ 1,100
Equity Method Investment Reported In Liabilities | $ (1,100) |
Charlotte [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Square Feet | ft² | 398 | 398
Equity Method Investment Reported In Liabilities | $ (10,300) | $ (4,100)
Galveston/Houston [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Square Feet | ft² | 353 | 353
Equity Method Investment Reported In Liabilities | $ (15,300) | $ (13,000)
Charlotte and Galveston/Houston [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment Reported In Liabilities |  | (17,100)
Unconsolidated Properties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 360,600 | 351,259
Unconsolidated Properties [Member] | National Harbor [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 86,700 | 86,400
Unconsolidated Properties [Member] | RioCan Canda [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 10,200 | 11,100
Unconsolidated Properties [Member] | Columbus [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 84,700 | 84,400
Unconsolidated Properties [Member] | Charlotte [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 99,500 | 89,800
Unconsolidated Properties [Member] | Galveston/Houston [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total joint venture debt, net | 79,500 | 79,400
Mortgages [Member] | Unconsolidated Properties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Net discount and debt origination costs | $ 1,400 | $ 1,400

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