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
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 58,835   $ 58,332
Total, net of cash received 1,279 $ 0  
Solar Photovoltaic Projects And EEX      
Business Acquisition [Line Items]      
Accounts receivable 150   1,015
Prepaid expenses and other current assets 2   12
Property and equipment and energy assets 315   0
Intangibles 500   680
Goodwill 406   2,845
Accounts payable 32   67
Billings in excess of cost and estimated earnings 62   0
Purchase price 1,279   4,619
Total, net of cash received 1,279   4,619
Debt assumed 0   0
Total fair value of consideration $ 1,279   $ 4,619