Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - RTS Energy Services Acquisition (Narrative) (Details)

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Acquisitions - RTS Energy Services Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 15, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Cash paid to acquire a business     $ 13,356 $ 39,570
RTS Energy Services LLC        
Business Acquisition [Line Items]        
Cash paid to acquire a business $ 7,600      
Consideration receivable $ 500      
Acquisition related costs   $ 0