Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND DISPOSITIONS - Dispositions (Details)

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ACQUISITIONS AND DISPOSITIONS - Dispositions (Details)
$ in Thousands
 12 Months Ended
Feb. 23, 2018
USD ($)
Dec. 31, 2019
helicopter
Dec. 31, 2018
USD ($)
helicopter
Dec. 31, 2017
helicopter
Property, Plant and Equipment [Line Items]        
2019 | $     $ 1,573  
Number of helicopter dispositions   5 21 3
Property, plant and equipment, disposals | $ $ 10,000      
Light Helicopters - Single Engine        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   0 10 1
Light Helicopters - Twin Engine        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   3 2 1
Medium Helicopter        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   2 1 1
Heavy Helicopter        
Property, Plant and Equipment [Line Items]        
Number of helicopter dispositions   0 8 0