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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2021
Inventories |
Schedule of inventories | Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (unaudited) | ​ | ​ | ​
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​
Refrigerant and cylinders | ​ | $ | 55,631 | ​ | $ | 53,593
Less: net realizable value adjustments | ​ |  | (7,380) | ​ |  | (9,133)
Total | ​ | $ | 48,251 | ​ | $ | 44,460

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