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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 22, 2019 | Feb. 28, 2019 | Aug. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 28, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration, net of cash acquired |  |  |  | $ 59,200 | $ 5,315 | $ 49,068 |
Goodwill recorded in acquisition |  |  |  | $ 33,663 |  |  |
Dema Service |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration, net of cash acquired | $ 14,200 |  |  |  |  |  |
Goodwill recorded in acquisition | $ 7,800 |  |  |  |  |  |
Space Cargo |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration, net of cash acquired |  | $ 45,000 |  |  |  |  |
Goodwill recorded in acquisition |  | $ 25,900 |  |  |  |  |
Milgram |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration, net of cash acquired |  |  | $ 47,300 |  |  |  |
Goodwill recorded in acquisition |  |  | $ 28,300 |  |  |  |
Prime Distribution Services | Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration per definitive agreement |  |  |  |  |  |  | $ 225,000

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