Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

v3.8.0.1
ACQUISITIONS AND DISPOSITIONS (Details)
$ in Thousands
3 Months Ended
Feb. 23, 2018
operating_facility
Mar. 31, 2018
USD ($)
helicopter
Mar. 31, 2017
USD ($)
acquisition
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]        
Purchases of property and equipment   $ 3,784 $ 1,005  
Capitalized interest payments (less than)   $ 100 $ 400  
Number of helicopter acquisitions | acquisition     0  
Number of helicopter dispositions | helicopter   12    
Number of operating facilities dispositions | operating_facility 2      
Proceeds from disposition of property and equipment   $ 19,497 $ 126  
Gains on asset dispositions, net   4,414 $ 109  
Construction in Progress        
Property, Plant and Equipment [Line Items]        
Interest capitalized in property and equipment   700   $ 1,900
S92 Heavy Helicopters        
Property, Plant and Equipment [Line Items]        
Purchases of property and equipment   $ 2,800    
Number of helicopter acquisitions | helicopter   1