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BUSINESS COMBINATION - Intangible assets (Details) - Aircraft Component Technologies, Inc. (ACT) $ in Thousands	Jan. 07, 2020 USD ($)
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair value of definite intangible assets acquired	$ 9,100
Useful Life In Years	10 years
Trademarks
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair value of indefinite intangible assets acquired	$ 200
FAA part 145 certificate
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair value of indefinite intangible assets acquired	$ 796

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