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Investment Funds (Details) $ in Thousands | Dec. 31, 2018 USD ($) fund | Dec. 31, 2017 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Number of investment funds | fund | 4 |
Cash |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | $ 1,255 | $ 444
Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 156 | 155
Accounts receivable |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 374 | 328
Costs and estimated earnings in excess of billings |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 498 | 360
Prepaid expenses and other current assets |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 190 | 8
Energy assets, net |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 122,641 | 55,712
Other assets |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, assets | 1,613 | 1,398
Accounts payable |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | 234 | 764
Accrued liabilities |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | 4,146 | 74
Other liabilities |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | 0 | 75
Current portions of long-term |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | 1,712 | 0
Long-term debt, net of deferred financing costs |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | 26,461 | 0
Other long-term liabilities |  |
Variable Interest Entity [Line Items] |  |
Variable interest entity, liabilities | $ 2,131 | $ 0

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