Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Summary of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details)

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Our Portfolio - Summary of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables $ 1,159,000 $ 1,250,000    
Loan Funding Commitments 315,000 282,000    
Allowance 36,000 36,000    
Loans 1,123,000      
Equity method investments, receivables, real estate and investments 2,917,000      
Special purpose subsidiaries        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Noncontrolling equity investments 29,000      
3        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance 8,000      
Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 135,000 248,000    
Loan Funding Commitments 0 0    
Allowance 0 0 $ 0 $ 0
Loans 135,054 248,455    
Government | 1        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 135,000      
Allowance 0      
Loans 135,000      
Equity method investments, receivables, real estate and investments 145,000      
U.S. federal government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 32,000      
State, local, institutions        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 103,000      
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 1,024,000 1,002,000    
Loan Funding Commitments 315,000 282,000    
Allowance 36,000 36,000 $ 26,000 $ 25,000
Loans 987,682 $ 965,452    
Commercial | 2        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 19,000      
Allowance 6,000      
Loans 13,000      
Equity method investments, receivables, real estate and investments 39,000      
Commercial | 3        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 8,000      
Allowance 8,000      
Loans 0      
Equity method investments, receivables, real estate and investments 0      
Commercial | 1        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total receivables 997,000      
Allowance 22,000      
Loans 975,000      
Equity method investments, receivables, real estate and investments 2,733,000      
Residential solar loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 536,000      
Residential solar loan | Special purpose subsidiaries        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 511,000      
Leasing arrangement | External credit rating, non investment grade        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Equity method investments, receivables, real estate and investments $ 48,000