Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 458,267 $ 471,044
Receivables 851,000  
Real estate 386,000  
Investments 124,370 $ 169,793
Total 1,797,000  
Average remaining balance 9,000  
Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments 436,000  
Commercial Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 156,000  
Real estate 364,000  
Investments 84,000  
Total 604,000  
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 45.00%  
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 352,000  
Real estate 0  
Investments 0  
Total 352,000  
Average remaining balance $ 15,000  
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 26.00%  
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 343,000  
Real estate 0  
Investments 40,000  
Total 383,000  
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 29.00%  
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 851,000  
Real estate 364,000  
Investments 124,000  
Total 1,339,000  
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 458,000  
Average remaining balance 15,000  
Equity Method Investments [Member] | Renewable Energy Projects [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 436,000