Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Impairment (Details)

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Investments in Unconsolidated Real Estate Joint Ventures - Impairment (Details) - Unconsolidated Properties [Member] - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Impairment charges     $ 6,181 $ 0 $ 14,359
Bromont and Les Factories St. Sauveur [Member]          
Schedule of Equity Method Investments [Line Items]          
Impairment charges         14,359
Company's share of impairment charge         $ 7,180
Les Factoreries St. Sauveur Property [Member]          
Schedule of Equity Method Investments [Line Items]          
Impairment charges $ 6,181        
Company's share of impairment charge $ 3,091 $ 3,100