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
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value $ 1,648,000   $ 1,648,000   $ 1,460,000
Loan Funding Commitments 166,000   166,000   184,000
Allowance 34,000   34,000   36,000
Loans 1,614,000   1,614,000    
Equity method investments, receivables, real estate and investments 3,922,000   3,922,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance     36,000    
Ending balance 34,000   34,000    
Commercial receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 1,545,000   1,545,000   1,335,000
Loan Funding Commitments 166,000   166,000   184,000
Allowance 34,000 $ 39,000 34,000 $ 39,000 36,000
Loans 1,511,261   1,511,261   1,298,529
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 37,000 37,000 36,000 36,000  
Provision for loss on receivables (3,000) 2,000 6,000 3,000  
Write-off of allowance 0 0 (8,000) 0  
Ending balance 34,000 39,000 34,000 39,000  
Commercial receivables | 2          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 0   0    
Allowance 0   0    
Loans 0   0    
Equity method investments, receivables, real estate and investments 22,000   22,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 0   0    
Commercial receivables | 3          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 11,000   11,000    
Allowance 5,000   5,000    
Loans 6,000   6,000    
Equity method investments, receivables, real estate and investments 6,000   6,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Provision for loss on receivables (3,000)   6,000    
Ending balance 5,000   5,000    
Commercial receivables | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 1,534,000   1,534,000    
Allowance 29,000   29,000    
Loans 1,505,000   1,505,000    
Equity method investments, receivables, real estate and investments 3,789,000   3,789,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 29,000   29,000    
Commercial receivables | Equity Method Investee          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 667,000   667,000    
Government receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 103,000   103,000   125,000
Loan Funding Commitments 0   0   0
Allowance 0 0 0 0 0
Loans 103,346   103,346   $ 125,409
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for loss on receivables 0 0 0 0  
Write-off of allowance 0 0 0 0  
Ending balance 0 $ 0 0 $ 0  
Government receivables | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 103,000   103,000    
Allowance 0   0    
Loans 103,000   103,000    
Equity method investments, receivables, real estate and investments 105,000   105,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 0   0    
Residential solar loan          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 1,000,000   1,000,000    
U.S. federal government          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 13,000   13,000    
State or local governments          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans $ 90,000   $ 90,000