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Business Acquisitions and Related Transactions - Purchase Price Allocation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Goodwill | $ 58,332 | $ 56,135 | $ 57,976
Total, net of cash received | 3,590 | 2,409 | 3,575
Solar Photovoltaic Projects And EEX |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 1,015 |  |
Prepaid expenses and other current assets | 12 | 256 | 263
Property and equipment and energy assets | 0 | 7,788 | 12,815
Intangibles | 680 |  |
Goodwill | 2,845 |  |
Accounts payable | 67 |  |
Purchase price | 4,619 | 8,044 | 13,078
Total, net of cash received | 4,619 | 8,044 | 13,078
Debt assumed | 0 | 5,635 | 9,503
Total fair value of consideration | $ 4,619 | $ 2,409 | $ 3,575

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