Annual report pursuant to Section 13 and 15(d)

Solar Energy Systems, net (Details)

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Solar Energy Systems, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]    
Solar energy systems, gross $ 3,622,005 $ 2,837,454
Less: accumulated depreciation and amortization (421,350) (303,305)
Add: construction-in-progress 119,053 95,217
Total solar energy systems, net 3,319,708 2,629,366
Solar energy system equipment costs    
Property Subject to or Available for Operating Lease [Line Items]    
Solar energy systems, gross 3,150,147 2,459,856
Inverters    
Property Subject to or Available for Operating Lease [Line Items]    
Solar energy systems, gross 319,309 260,011
Initial direct costs    
Property Subject to or Available for Operating Lease [Line Items]    
Solar energy systems, gross $ 152,549 $ 117,587