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PROPERTY, PLANT, AND EQUIPMENT - Schedule of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Less: accumulated depreciation and amortization $ 371,262 $ 406,893
Property, plant and equipment, net 1,774,142 1,293,299
Depreciable property, plant and equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 1,044,228 789,126
Property, plant and equipment, net 672,966 382,233
Land and improvements    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 90,770 21,769
Estimated Useful Lives 20 years  
Building and improvements    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 509,709 275,186
Building and improvements | Minimum    
Property, Plant, and Equipment [Line Items]    
Estimated Useful Lives 10 years  
Building and improvements | Maximum    
Property, Plant, and Equipment [Line Items]    
Estimated Useful Lives 39 years  
Mining equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 308,479 393,623
Estimated Useful Lives 3 years  
Electrical and mechanical equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 127,885 80,384
Estimated Useful Lives 15 years  
Other property, plant and equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,385 18,164
Other property, plant and equipment | Minimum    
Property, Plant, and Equipment [Line Items]    
Estimated Useful Lives 5 years  
Other property, plant and equipment | Maximum    
Property, Plant, and Equipment [Line Items]    
Estimated Useful Lives 7 years  
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,101,176 $ 911,066