Annual report pursuant to Section 13 and 15(d)

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed, RTS (Details)

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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed, RTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jun. 15, 2018
Dec. 31, 2017
Jun. 05, 2017
May 26, 2017
Business Acquisition [Line Items]            
Inventories         $ 306  
Property, plant and equipment         20,520 $ 23,373
Goodwill $ 67,581 $ 101,245   $ 99,811 10,193  
Total assets acquired         $ 45,234  
RTS Energy Services LLC            
Business Acquisition [Line Items]            
Inventories     $ 180      
Property, plant and equipment     7,787      
Goodwill     133      
Total assets acquired     $ 8,100