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
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Sale Leaseback Transaction [Line Items]      
Financing lease assets, net $ 37,731 $ 38,263 $ 38,263
Solar Photovoltaic Projects      
Sale Leaseback Transaction [Line Items]      
Deferred loss, short-term, net 115   115
Deferred loss, long-term, net 1,888   1,917
Total deferred loss 2,003   2,032
Financing lease liabilities, short-term 4,958   4,956
Financing lease liabilities, long-term 28,379   28,407
Total financing lease liabilities 33,337   33,363
Deferred gain, short-term, net 345   345
Deferred gain, long-term, net 5,722   5,808
Total deferred gain $ 6,067   $ 6,153