Annual report pursuant to Section 13 and 15(d)

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

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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Impairment charges       $ 0
Unconsolidated Properties [Member]        
Schedule of Equity Method Investments [Line Items]        
Impairment charges   $ 0 $ 14,359,000 18,042,000
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