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Investments in Unconsolidated Real Estate Joint Ventures Investments in Unconsolidated Real Estate Joint Ventures - Impairment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairment charges |  |  | $ 0 | $ 0
Unconsolidated Properties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairment charges |  | $ 14,359,000 | 18,042,000 | 5,838,000
Unconsolidated Properties [Member] | Bromont and Les Factories St. Sauveur [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairment charges |  | 14,359,000 | 18,042,000 |
Company's share of impairment charge | $ 7,200,000 | $ 7,180,000 | $ 9,021,000 |
Unconsolidated Properties [Member] | Bromont Outlet Mall Property [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Impairment charges |  |  |  | 5,838,000
Company's share of impairment charge |  |  |  | $ 2,919,000

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- Definition Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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