Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities (Details)

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Variable Interest Entities (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Apr. 06, 2018
Variable Interest Entity [Line Items]      
Ownership percentage 100.00% 100.00%  
Dire Wolf Energy Services LLC | Cobra Aviation Services LLC      
Variable Interest Entity [Line Items]      
Interest transferred     100.00%
Predator Aviation LLC | Leopard Aviation LLC      
Variable Interest Entity [Line Items]      
Interest transferred     100.00%
ARS      
Variable Interest Entity [Line Items]      
Ownership percentage 100.00%    
Brim Acquisitions LLC      
Variable Interest Entity [Line Items]      
Ownership percentage 49.00%