Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Equity Method Investments (Details)

v3.20.1
Our Portfolio - Equity Method Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Carrying Value $ 581,930 $ 498,631
University of Iowa Energy Collaborative Holdings LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 115,000  
2007 Vento I, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 79,000  
Buckeye Wind Energy Class B Holdings, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 70,000  
Vivint Solar Asset 1 Class B, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 61,000  
Vivint Solar Asset 2 Class B, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 49,000  
Invenergy Gunsight Mountain Holdings, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 36,000  
3D Engie, LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 30,000  
2019 K102 Investor LLC    
Schedule of Equity Method Investments [Line Items]    
Carrying Value 29,000  
Other investees    
Schedule of Equity Method Investments [Line Items]    
Carrying Value $ 113,000