Inventories, net (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Coal | $ 145,353 | $ 125,907 |
| Raw materials, parts, supplies and other, net | 119,531 | 110,029 |
| Total inventories, net | $ 264,884 | $ 235,936 |
| X | ||||||||||
- Definition Inventory, raw materials, purchased parts, supplies and other, net of reserve. No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|