Quarterly report pursuant to Section 13 or 15(d)

ESCROW DEPOSITS - Narrative (Details)

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ESCROW DEPOSITS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Deposits in like-kind exchange escrow accounts       $ 3,800
Purchases of property and equipment   $ 13,121 $ 10,712  
Escrow deposit, returned to the company $ 1,000      
S92 Heavy Helicopters        
Property, Plant and Equipment [Line Items]        
Purchases of property and equipment $ 2,800