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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Inventories |  |
Refrigerants and cylinders | $ 49,602 | $ 72,088
Less: net realizable value adjustments | (9,228) | (12,850)
Total | $ 40,374 | $ 59,238

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