Annual report pursuant to Section 13 and 15(d)

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed Air Rescue Systems and Brim Equipment Assets (Details)

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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed Air Rescue Systems and Brim Equipment Assets (Details) - USD ($)
$ in Thousands
Dec. 21, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 05, 2017
May 26, 2017
Business Acquisition [Line Items]            
Accounts receivable         $ 4,408  
Property, plant and equipment         20,520 $ 23,373
Goodwill   $ 67,581 $ 101,245 $ 99,811 10,193  
Other assets         7  
Total assets acquired         $ 45,234  
Cobra Aviation Services LLC | ARS            
Business Acquisition [Line Items]            
Accounts receivable $ 146          
Property, plant and equipment 1,702          
Identifiable intangible assets 120          
Goodwill 694          
Other assets 5          
Total assets acquired $ 2,667          
Acquired finite-lived intangible assets, weighted average useful life (in years) 20 years          
Cobra Aviation Services LLC | Brim Equipment Assets            
Business Acquisition [Line Items]            
Accounts receivable $ 0          
Property, plant and equipment 1,990          
Identifiable intangible assets 0          
Goodwill 2,243          
Other assets 0          
Total assets acquired $ 4,233