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Real Estate Activity - Schedule of Gain (Loss) on Sale or Write-down of Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Gain on sale or write-down of assets, net $ 17,398 $ 4,138
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, net 5,957 4,138
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, net $ 11,441 $ 0