Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Schedule of Inventory Allowance (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Schedule of Inventory Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 21,575 $ 12,650 $ 806
Balance at end of period 34,967 21,575 12,650
Inventory Valuation Reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 4,012 4,821 5,091
Foreign currency adjustments (273) (809) (270)
Balance at end of period 3,739 $ 4,012 $ 4,821
H225 Helicopters | Inventory Valuation Reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Foreign currency adjustments $ 119