Annual report pursuant to Section 13 and 15(d)

LEASES - Narrative (Details)

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LEASES - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
helicopter
Dec. 31, 2018
USD ($)
helicopter
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]      
Rental expense $ 4,000    
Short-term Lease $ 1,500    
Number of helicopter dispositions | helicopter 2 6  
Sales-type lease, interest income $ 1,700    
Proceeds from disposition of property and equipment 13,252 $ 29,590 $ 9,392
Sales-type lease receivable $ 13,500    
Minimum      
Property, Plant and Equipment [Line Items]      
Remaining lease term 1 year    
Maximum      
Property, Plant and Equipment [Line Items]      
Remaining lease term 59 years    
H225 Helicopters      
Property, Plant and Equipment [Line Items]      
Proceeds from disposition of property and equipment $ 5,000