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Real Estate Activity - Schedule of Gain (Loss) on Sale or Write-down of Assets (Details)
$ in Thousands
12 Months Ended
Sep. 14, 2020
USD ($)
ft²
May 01, 2020
USD ($)
apartment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Gain on sale or write-down of assets     $ 36,895 $ 15,192 $ 171,530
Repayments of mortgage notes     13,823 52,976 124,616
Sold          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Cash received   $ 4,215      
Villager | Sold          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Number of units in real estate property | apartment   33      
Proceeds from sale   $ 2,426      
Gain on sale   960      
Assumption value of the mortgage note payable   665      
Villager | Sold | Notes Receivable          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Notes receivable   $ 1,761      
Farnham Park | Sold          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Number of units in real estate property | apartment   144      
Proceeds from sale   $ 13,300      
Gain on sale   2,742      
Assumption value of the mortgage note payable   $ 9,085      
Bridge View Plaza          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Repayments of mortgage notes $ 3,375        
Bridge View Plaza | Sold          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Proceeds from sale 5,250        
Gain on sale $ 4,610        
Area (sq ft) | ft² 122,205        
Land          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Gain on sale or write-down of assets     25,171 14,889 17,404
Multifamily          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Gain on sale or write-down of assets     3,702 (80) 154,126
Commercial Real Estate          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Gain on sale or write-down of assets     4,610 0 0
Other          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Gain on sale or write-down of assets     $ 3,412 $ 383 $ 0