Annual report pursuant to Section 13 and 15(d)

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed WTL Oil (Details)

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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed WTL Oil (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2018
Jun. 05, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 26, 2017
Business Acquisition [Line Items]            
Property, plant and equipment   $ 20,520       $ 23,373
Goodwill   10,193 $ 67,581 $ 101,245 $ 99,811  
Total assets acquired   $ 45,234        
WTL Oil LLC            
Business Acquisition [Line Items]            
Property, plant and equipment $ 2,960          
Goodwill 1,567          
Total assets acquired $ 6,107          
Minimum            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (in years)   5 years        
Minimum | WTL Oil LLC            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (in years) 10 years          
Maximum            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (in years)   10 years        
Maximum | WTL Oil LLC            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life (in years) 20 years          
Customer relationships            
Business Acquisition [Line Items]            
Identifiable intangible assets   $ 1,140        
Acquired finite-lived intangible assets, weighted average useful life (in years)     3 years 4 months      
Customer relationships | WTL Oil LLC            
Business Acquisition [Line Items]            
Identifiable intangible assets $ 930          
Trade names            
Business Acquisition [Line Items]            
Identifiable intangible assets   $ 820        
Acquired finite-lived intangible assets, weighted average useful life (in years)     8 years 3 months 3 days      
Trade names | WTL Oil LLC            
Business Acquisition [Line Items]            
Identifiable intangible assets $ 650