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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventories |  |
Refrigerant and cylinders | $ 65,889 | $ 53,593
Less: net realizable value adjustments | (7,100) | (9,133)
Total | $ 58,789 | $ 44,460

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