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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Schedule of Inventory Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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