Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND DISPOSITIONS Dispositions (Details)

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ACQUISITIONS AND DISPOSITIONS Dispositions (Details)
$ in Millions
 12 Months Ended
Feb. 23, 2018
USD ($)
operating_facility
helicopter
Dec. 31, 2018
helicopter
Dec. 31, 2017
helicopter
Dec. 31, 2016
helicopter
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   21 3 9
Number of operating facilities sold | operating_facility 2      
Property, plant and equipment, disposals | $ $ 10.0      
Light helicopters - single engine        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   10 1 2
Light helicopters - twin engine        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   2 1 1
Medium helicopters        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   1 1 6
Heavy helicopters        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   8 0 0
AS350 Single Engine Helicopter        
Property, Plant and Equipment [Line Items]        
Number of disposals 8