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, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying Value $ 1,158,000 $ 1,162,000  
Allowance 26,000 25,000  
Net receivables 1,132,000    
Financing receivables, investments, real estate and equity method investments 2,138,000    
Financing receivables on non accrual status 0    
Government      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying Value 259,000 270,000  
Allowance 0 0  
Receivables 259,085   $ 263,175
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying Value 899,000 892,000  
Allowance 26,000 $ 25,000 8,000
Receivables 873,397   $ 896,432
U.S. Federal Government      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivables 150,000    
State, Local, Institutions      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivables 109,000    
Residential Solar Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net receivables 453,000    
Special Purpose Subsidiaries      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Noncontrolling equity investments 25,000    
Special Purpose Subsidiaries | Residential Solar Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net receivables 367,000    
External Credit Rating, Non Investment Grade | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivables on non accrual status 8,000    
External Credit Rating, Non Investment Grade | Leasing Arrangement      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivables, investments, real estate and equity method investments 88,000    
1 | Government      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying Value 259,000    
Allowance 0    
Net receivables 259,000    
Financing receivables, investments, real estate and equity method investments 294,000    
1 | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying Value 891,000    
Allowance 18,000    
Net receivables 873,000    
Financing receivables, investments, real estate and equity method investments $ 1,821,000