Quarterly report pursuant to Section 13 or 15(d)

Investment Funds (Details)

v3.10.0.1
Investment Funds (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Cash    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets $ 763 $ 444
Restricted cash    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets 1,623 1,553
Accounts receivable    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets 448 328
Costs and estimated earnings in excess of billings    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets 539 360
Prepaid expenses and other current assets    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets 140 8
Energy assets, net    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets 73,401 55,712
Accounts payable    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, liabilities 181 764
Accrued liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, liabilities 19 74
Other liabilities    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, liabilities 86 75
Long term debt, net deferred finance fees    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, liabilities $ 10,882 $ 0