Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Pro Forma RTS Acquisition (Details)

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Acquisitions - Pro Forma RTS Acquisition (Details) - RTS Energy Services LLC - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]    
Revenues $ 630  
Net income 7  
Depreciation 100  
Revenues 10,160 $ 8,326
Net income (loss) $ (848) $ 653