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
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]    
Deposits in like-kind exchange escrow accounts $ 3,300  
Purchases of property and equipment 3,784 $ 1,005
Escrow deposit, returned to the company 500  
S92 Heavy Helicopters    
Property, Plant and Equipment [Line Items]    
Purchases of property and equipment $ 2,800