Annual report pursuant to Section 13 and 15(d)

Acquisitions - RTS Energy Services Acquisition Narrative (Details)

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Acquisitions - RTS Energy Services Acquisition Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 15, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2016
Business Acquisition [Line Items]              
Cash paid to acquire a business       $ 0 $ 20,824,000 $ 42,008,000  
Impairment of goodwill $ 30,500,000     33,664,000 3,203,000 0 [2] $ 0
Inventory obsolescence     $ 1,300,000 1,349,000 0 $ 0  
RTS Energy Services LLC              
Business Acquisition [Line Items]              
Cash paid to acquire a business   $ 8,100,000          
Depreciation       2,300,000 $ 900,000    
Acquisition related costs       $ 100,000      
Impairment of goodwill     100,000        
Inventory obsolescence     $ 200,000        
[1] (a) Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.
[2] Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.