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BUSINESS COMBINATIONS - Unaudited Pro Forma Financial Information (Details) - HydroChemPSC - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Pro forma combined revenues | $ 4,380,724 | $ 3,859,430
Pro forma combined net income | $ 229,807 | $ 149,219

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