Quarterly report pursuant to Section 13 or 15(d)

LEASES - Narrative (Details)

v3.19.3
LEASES - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
helicopter
Sep. 30, 2019
USD ($)
helicopter
Sep. 30, 2018
USD ($)
helicopter
Dec. 31, 2018
helicopter
Property, Plant and Equipment [Line Items]        
Rental expense $ 1,300 $ 2,900    
Short-term lease expense $ 700 $ 1,200    
Number of helicopter dispositions | helicopter 2 3 20 6
Sales-type lease, interest income $ 400 $ 1,400    
Proceeds from disposition of property and equipment   9,252 $ 29,520  
Sales-type lease receivables 13,600 13,600    
Sales-type lease receivables, current 9,800 9,800    
Sales-type lease receivables, non-current 3,800 $ 3,800    
H225 Helicopters        
Property, Plant and Equipment [Line Items]        
Proceeds from disposition of property and equipment $ 5,000      
Minimum        
Property, Plant and Equipment [Line Items]        
Remaining lease term   1 year    
Maximum        
Property, Plant and Equipment [Line Items]        
Remaining lease term   60 years