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Inventory (Tables)
6 Months Ended
Jun. 30, 2026
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventory as of December 31, 2025 and June 30, 2026 consisted of the following (in thousands):

  ​ ​ ​

December 31, 

  ​ ​ ​

June 30, 

2025

2026

Raw materials and spare parts

$

43,906

$

43,282

Total inventory

$

43,906

$

43,282