Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Amounts Related to Sale-Leaseback (Details)

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Summary of Significant Accounting Policies - Amounts Related to Sale-Leaseback (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Sale Leaseback Transaction [Line Items]      
Capital lease assets, net $ 6,255 $ 5,303  
Assets Held under Capital Leases      
Sale Leaseback Transaction [Line Items]      
Capital lease assets, net 36,690 36,676  
Solar Photovoltaic Projects      
Sale Leaseback Transaction [Line Items]      
Deferred loss, short-term, net 115 118  
Deferred loss, long-term, net 1,975 2,054  
Total deferred loss 2,090 2,172 $ 144
Capital lease liabilities, short-term 4,718 4,157  
Capital lease liabilities, long-term 29,425 30,712  
Total capital lease liabilities 34,143 34,869  
Deferred gain, short-term, net 318 338  
Deferred gain, long-term, net 5,467 5,835  
Total deferred gain $ 5,785 $ 6,173 $ 932