Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Related Transactions - Narrative (Details)

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Business Acquisitions and Related Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2017
USD ($)
project
Mar. 31, 2018
USD ($)
project
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Energy assets, net   $ 381,724 $ 356,443
Solar Photovoltaic Projects      
Business Acquisition [Line Items]      
Number of projects acquired | project 2 2  
Initial cash payment $ 2,409 $ 21,000  
Debt assumed $ 5,635    
Fair value of consideration   55,000  
Energy assets, net   $ 21,000  
Minimum      
Business Acquisition [Line Items]      
Estimated useful life   1 year  
Minimum | Solar Photovoltaic Projects      
Business Acquisition [Line Items]      
Estimated useful life   1 year  
Maximum      
Business Acquisition [Line Items]      
Estimated useful life   15 years  
Maximum | Solar Photovoltaic Projects      
Business Acquisition [Line Items]      
Estimated useful life   15 years