Annual report pursuant to Section 13 and 15(d)

Investment Funds - Schedule of Variable Interest Entity Financial Information (Details)

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Investment Funds - Schedule of Variable Interest Entity Financial Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash    
Variable Interest Entity [Line Items]    
Variable interest entity, assets $ 4,666 $ 1,255
Restricted cash    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 586 156
Accounts receivable    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 532 374
Costs and estimated earnings in excess of billings    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 1,125 498
Prepaid expenses and other current assets    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 108 190
Property and equipment, net    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 1,266 0
Energy assets, net    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 142,456 122,641
Operating lease asset    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 6,511 0
Other assets    
Variable Interest Entity [Line Items]    
Variable interest entity, assets 1,662 1,613
Accounts payable    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 2,006 234
Accrued liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 2,203 4,146
Current lease liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 102 0
Current portions of long-term    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 2,252 1,712
Long-term debt, net of deferred financing costs    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 24,654 26,461
Long-term lease liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities 6,180 0
Other long-term liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, liabilities $ 1,171 $ 2,131