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Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended 9 Months Ended
Feb. 01, 2019
Sep. 30, 2020
USD ($)
variable_interest_entity
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
variable_interest_entity
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]            
Loans held for sale   $ 0   $ 0    
Conversion of stock, conversion ratio 1     1    
Cash equivalents   0   $ 0   $ 0
Impairment of operating real estate   3,451,000 $ 272,722,000 33,512,000 $ 282,846,000  
Income tax expense (benefit)   (15,357,000) $ 1,046,000 (11,544,000) $ 544,000  
Projected income tax refund   12,900,000   12,900,000    
CRE securities            
Variable Interest Entity [Line Items]            
Investments in unconsolidated ventures   $ 3,400,000   $ 32,600,000    
Unconsolidated VIEs | Third Party Joint Venture Partners | Minimum            
Variable Interest Entity [Line Items]            
Ownership percentage by noncontrolling owners (in percentage)   3.50%   3.50%    
Unconsolidated VIEs | Third Party Joint Venture Partners | Maximum            
Variable Interest Entity [Line Items]            
Ownership percentage by noncontrolling owners (in percentage)   20.00%   20.00%    
Primary Beneficiary            
Variable Interest Entity [Line Items]            
Number of investing VIEs | variable_interest_entity   2   2