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Inventory (Tables)
9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventory as of December 31, 2021 and September 30, 2022 consisted of the following (in thousands):

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December 31, 

    

September 30, 

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2021

​

2022

Raw materials and spare parts

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$

31,302

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$

35,927

Total inventory

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$

31,302

​

$

35,927