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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Loss contingency, estimate of possible loss | $ 100 |
Purchase obligation | 86,900 |
Chassis converter pool agreements | 17,767 | $ 10,164
Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding, amount | 6,800 |
Chassis Converter Pool Agreements |  |
Loss Contingencies [Line Items] |  |
Other inventory, gross | $ 2,600 |

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