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, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 37,869 $ 34,967 $ 21,575
Balance at end of period 41,492 37,869 34,967
Inventory Valuation Reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,246 3,739 4,012
Increase (decrease) in allowances, net (15) 493 273
Balance at end of period $ 3,261 $ 3,246 3,739
H225 Helicopters | Inventory Valuation Reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Increase (decrease) in allowances, net     $ 100