Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

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ACQUISITIONS AND DISPOSITIONS (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
operating_facility
helicopter
Sep. 30, 2017
USD ($)
helicopter
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]          
Purchases of property and equipment     $ 7,686 $ 13,121  
Interest capitalized during the period     $ 97 451  
Number of helicopter dispositions | helicopter     20    
Number of operating facilities dispositions | operating_facility     2    
Proceeds from disposition of property and equipment     $ 29,520 5,690  
Receivables held-for-sale, amount $ 14,300   14,300    
Gain on disposition of property plant equipment     2,300    
Sales-type lease, revenue     1,200    
Gains on asset dispositions, net (148) $ (122) 2,269 $ 5,048  
Construction in Progress          
Property, Plant and Equipment [Line Items]          
Interest capitalized in property and equipment $ 700   700   $ 1,900
AW189 Heavy Helicopters          
Property, Plant and Equipment [Line Items]          
Number of helicopter acquisitions | helicopter       2  
S92 Heavy Helicopters          
Property, Plant and Equipment [Line Items]          
Purchases of property and equipment     $ 2,800    
Number of helicopter acquisitions | helicopter     1 1  
H225 Helicopters          
Property, Plant and Equipment [Line Items]          
Number of helicopter dispositions | helicopter     5    
Sales-type lease, loss     $ 3,600