Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

v3.7.0.1
ACQUISITIONS AND DISPOSITIONS (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
acquisition
helicopter
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]          
Purchases of property and equipment     $ 12,524 $ 5,106  
Capitalized interest payments (less than) $ 100 $ 0 $ 500 0  
Number of helicopter acquisitions | acquisition     0    
Number of helicopter dispositions | helicopter     2    
Proceeds from disposition of property and equipment     $ 5,689 5,910  
Gains on asset dispositions, net 5,061 $ 1,367 5,170 $ 4,280  
Construction in Progress          
Property, Plant and Equipment [Line Items]          
Interest capitalized in property and equipment 1,800   $ 1,800   $ 4,500
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