Quarterly report pursuant to Section 13 or 15(d)

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

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Our Portfolio - Schedule of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value $ 2,275,000   $ 2,275,000   $ 2,031,000
Loan Funding Commitments 299,000   299,000   256,000
Allowance 44,000   44,000   41,000
Loans 2,231,000   2,231,000    
Equity method investments, receivables, real estate and investments 4,896,000   4,896,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance     41,000    
Ending balance 44,000   44,000    
Commercial receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,178,000   2,178,000   1,928,000
Loan Funding Commitments 299,000   299,000   256,000
Allowance 44,000 $ 37,000 44,000 $ 37,000 41,000
Loans 2,134,154   2,134,154   1,887,483
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 43,000 37,000 41,000 36,000  
Provision for loss on receivables 1,000 8,000 3,000 9,000  
Write-off of allowance 0 (8,000) 0 (8,000)  
Ending balance 44,000 37,000 44,000 37,000  
Commercial receivables | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 2,178,000   2,178,000    
Allowance 44,000   44,000    
Loans 2,134,000   2,134,000    
Equity method investments, receivables, real estate and investments 4,771,000   4,771,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 44,000   44,000    
Government receivables          
Financing Receivable, Credit Quality Indicator [Line Items]          
Gross Carrying Value 97,000   97,000   103,000
Loan Funding Commitments 0   0   0
Allowance 0 0 0 0 0
Loans 96,558   96,558   $ 102,511
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 97,000   97,000    
Allowance 0   0    
Loans 97,000   97,000    
Equity method investments, receivables, real estate and investments 102,000   102,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance 0   0    
Residential solar loan          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 1,200,000   1,200,000    
U.S. federal government          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans 10,000   10,000    
State or local governments          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans $ 87,000   $ 87,000