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, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 34,967 $ 21,575 $ 12,650
Balance at end of period 37,869 34,967 21,575
Inventory Valuation Reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,739 4,012 4,821
Additional allowances, net 493 273 809
Balance at end of period $ 3,246 3,739 $ 4,012
H225 Helicopters | Inventory Valuation Reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additional allowances, net   $ 100