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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value $ 1,474,000   $ 1,460,000
Loan Funding Commitments 196,000   184,000
Allowance 36,000    
Loans 1,437,000    
Equity method investments 1,871,168   1,759,651
Equity method investments, receivables, real estate and investments 3,750,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 37,000   36,000
Ending balance 37,000    
3      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 8,000    
Ending balance 8,000    
Equity Method Investee      
Financing Receivable, Credit Quality Indicator [Line Items]      
Equity method investments 119,000    
Commercial receivables      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 1,358,000   1,335,000
Loan Funding Commitments 196,000   184,000
Allowance 36,000 $ 36,000  
Loans 1,320,507   1,298,529
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 37,000 36,000 36,000
Provision for loss on receivables 1,000 0  
Ending balance 37,000 36,000  
Commercial receivables | 2      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 11,000    
Loans 8,000    
Equity method investments 29,000    
Equity method investments, receivables, real estate and investments 37,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 3,000    
Ending balance 3,000    
Commercial receivables | 3      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 8,000    
Loans 0    
Equity method investments 0    
Equity method investments, receivables, real estate and investments 0    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 8,000    
Ending balance 8,000    
Commercial receivables | 1      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 1,339,000    
Loans 1,313,000    
Equity method investments 1,842,000    
Equity method investments, receivables, real estate and investments 3,588,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 26,000    
Ending balance 26,000    
Commercial receivables | Equity Method Investee      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans 702,000    
Government receivables      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 116,000   125,000
Loan Funding Commitments 0   0
Allowance 0 0  
Loans 116,183   125,409
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 0 0 $ 0
Provision for loss on receivables 0 0  
Ending balance 0 $ 0  
Government receivables | 1      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross Carrying Value 116,000    
Loans 116,000    
Equity method investments 0    
Equity method investments, receivables, real estate and investments 125,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loss on receivables 0    
Ending balance 0    
Residential solar loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans 781,000    
Leasing arrangement      
Financing Receivable, Credit Quality Indicator [Line Items]      
Equity method investments, receivables, real estate and investments 48,000    
State or local governments      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans 96,000    
U.S. federal government      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans $ 20,000