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Acquisitions - Acquisition of Perigee (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Goodwill $ 120,343 $ 120,154
Perigee Energy, LLC | National Gas & Electric, LLC    
Business Acquisition [Line Items]    
Cash   23
Intangible assets—customer relationships   1,100
Goodwill   1,540
Net working capital, net of cash acquired   2,085
Fair value of derivative liabilities   (443)
Total   $ 4,305