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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2021
Inventories |
Schedule of inventories | Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (unaudited) | ​ | ​ | ​
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​
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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