Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Related Transactions - Consideration Paid and the Allocation of the Purchase Price (Details)

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Business Acquisitions and Related Transactions - Consideration Paid and the Allocation of the Purchase Price (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 57,268   $ 56,135
Total, net of cash received 34,044 $ 2,409  
Solar Photovoltaic Projects And EEX      
Business Acquisition [Line Items]      
Accounts receivable 353   0
Prepaid expenses and other current assets 0   256
Property and equipment and energy assets 20,770   7,788
Intangibles 500   0
Goodwill 1,431   0
Accounts payable (42)   0
Purchase price 23,096   8,044
Total, net of cash received 23,096   8,044
Debt assumed 0   5,635
Total fair value of consideration $ 23,096   $ 2,409