Quarterly report pursuant to Section 13 or 15(d)

ESCROW DEPOSITS - Narrative (Details)

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ESCROW DEPOSITS - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Deposits in like-kind exchange escrow accounts     $ 3,300
Purchases of property and equipment $ 5,958 $ 12,524  
Escrow deposit, returned to the company 500    
S92 Heavy Helicopters      
Property, Plant and Equipment [Line Items]      
Purchases of property and equipment $ 2,800