Annual report pursuant to Section 13 and 15(d)

Acquisitions - ARS and Brim Equipment Acquisition Narrative (Details)

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Acquisitions - ARS and Brim Equipment Acquisition Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 21, 2018
USD ($)
helicopter
Jun. 05, 2017
USD ($)
May 26, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
[1]
Business Acquisition [Line Items]            
Cash paid to acquire a business       $ 0 $ 20,824 $ 42,008
Total consideration transferred   $ 25,762 $ 36,320      
Air Rescue Systems Corporation and Brim Equipment Assets            
Business Acquisition [Line Items]            
Acquisition related costs       $ 300    
Cobra Aviation Services LLC            
Business Acquisition [Line Items]            
Number of assets purchased | helicopter 2          
Cobra Aviation Services LLC | ARS            
Business Acquisition [Line Items]            
Cash paid to acquire a business $ 2,700          
Total consideration transferred 4,200          
Brim Acquisitions LLC            
Business Acquisition [Line Items]            
Initial capital of acquisition $ 2,000          
Brim Acquisitions LLC | Cobra Aviation Services LLC            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage 49.00%          
Brim Acquisitions LLC | Wexford Partners Investment Co. LLC            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage 51.00%          
[1] (a) Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.