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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended
	Mar. 02, 2020	May 22, 2019	Feb. 28, 2019	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Total purchase consideration net of cash acquired				$ 223,617	$ 44,143
Goodwill recorded in acquisition				$ 176,904
Prime Distribution Services
Business Acquisition [Line Items]
Cash consideration for acquisition	$ 223,100
Goodwill recorded in acquisition	$ 176,400
Dema Service
Business Acquisition [Line Items]
Total purchase consideration net of cash acquired		$ 14,200
Goodwill recorded in acquisition		$ 7,800
Space Cargo
Business Acquisition [Line Items]
Total purchase consideration net of cash acquired			$ 45,500
Goodwill recorded in acquisition			$ 26,400

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-Topic 350
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Publisher FASB
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-Topic 805
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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