Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

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ACQUISITIONS AND DISPOSITIONS (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
helicopter
Mar. 31, 2019
USD ($)
helicopter
Dec. 31, 2019
USD ($)
helicopter
Dec. 31, 2018
helicopter
Property, Plant and Equipment [Line Items]        
Purchases of property and equipment | $ $ 400,000 $ 1,312,000    
Interest capitalized during the period | $ $ 0 $ 0    
Number of helicopter acquisitions | helicopter 0 0    
Number of helicopter dispositions | helicopter 0 0 2 6
Number of helicopters parted out | helicopter 1      
Construction in Progress        
Property, Plant and Equipment [Line Items]        
Interest capitalized in property and equipment | $ $ 700,000   $ 700,000