Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Acquisitions - RTS Energy Services Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 15, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]        
Cash paid to acquire a business   $ 0 $ 13,356  
RTS Energy Services LLC        
Business Acquisition [Line Items]        
Cash paid to acquire a business $ 8,100      
Acquisition related costs       $ 100