Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Details)

v3.19.3
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 449,304 $ 471,044
Receivables 975,000  
Real estate 385,000  
Investments 113,177 $ 169,793
Total 1,900,000  
Average remaining balance 9,000  
Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments 427,000  
Commercial Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 158,000  
Real estate 363,000  
Investments 79,000  
Total 600,000  
Average remaining balance $ 6,000  
Commercial Investment Grade [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 41.00%  
Commercial Investment Grade [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Commercial Non-Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 517,000  
Real estate 0  
Investments 0  
Total 517,000  
Average remaining balance $ 16,000  
Commercial Non-Investment Grade [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 36.00%  
Commercial Non-Investment Grade [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Government [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 300,000  
Real estate 0  
Investments 34,000  
Total 334,000  
Average remaining balance $ 8,000  
Government [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 23.00%  
Government [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Subtotal, Debt and Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 975,000  
Real estate 363,000  
Investments 113,000  
Total 1,451,000  
Average remaining balance $ 8,000  
Subtotal, Debt and Real Estate [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 100.00%  
Subtotal, Debt and Real Estate [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Equity Method Investments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 0  
Real estate 22,000  
Investments 0  
Total 449,000  
Average remaining balance 15,000  
Equity Method Investments [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 427,000