Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

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ACQUISITIONS AND DISPOSITIONS (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
acquisition
helicopter
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]            
Purchases of property and equipment       $ 13,121,000 $ 10,712,000  
Capitalized interest payments (less than) $ 0   $ 0 $ 500,000 0  
Number of helicopter acquisitions | acquisition       0    
Number of helicopter dispositions | helicopter       2    
Proceeds from disposition of property and equipment       $ 5,690,000 6,138,000  
Gains (losses) on asset dispositions, net (122,000)   $ (246,000) 5,048,000 $ 4,034,000  
Construction in Progress            
Property, Plant and Equipment [Line Items]            
Interest capitalized in property and equipment $ 1,800,000     $ 1,800,000   $ 4,500,000
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   $ 2,800,000        
Number of helicopter acquisitions | helicopter       1