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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Purchase obligation | $ 129,600 |
Chassis converter pool agreements | 18,185 | $ 17,767
Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding, amount | 5,700 |
Chassis Converter Pool Agreements |  |
Loss Contingencies [Line Items] |  |
Other inventory, gross | $ 2,600 |

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