Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities - Narrative (Details)

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Variable Interest Entities - Narrative (Details) - helicopter
 3 Months Ended 12 Months Ended
Apr. 06, 2018
Mar. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Percentage of ownership   100.00% 100.00%
Dire Wolf Energy Services LLC | Cobra Aviation Services LLC      
Variable Interest Entity [Line Items]      
Interest transferred 100.00%    
Cobra Aviation Services LLC      
Variable Interest Entity [Line Items]      
Number of helicopters 3    
ARS      
Variable Interest Entity [Line Items]      
Percentage of ownership 100.00%    
Wexford      
Variable Interest Entity [Line Items]      
Percentage of ownership 49.00% 48.20% 48.90%