v3.26.1
SEGMENT REPORTING - Schedule of Reportable Segment Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 20, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Significant segment expenses:        
Selling, general, and administrative   $ (69,363,000) $ (49,286,000) $ (48,831,000)
Other segment items   1,620,000 4,407,000 18,321,000
Stock-based compensation   (17,569,000) (17,466,000) (12,905,000)
Asset retirement obligations accretion   (1,667,000) (1,465,000) (1,403,000)
Depreciation, depletion, and amortization   (68,155,000) (65,615,000) (54,252,000)
Other expense   (5,559,000) (1,732,000) (3,978,000)
Other non-operating   (500,000)    
Interest expense, net   (7,804,000) (6,123,000) (8,903,000)
Income tax benefit (expense)   10,694,000 (3,728,000) (22,350,000)
Net income (loss) $ 31,382,000 (51,446,000) 11,192,000 82,313,000
Segment capital expenditures   66,284,000 71,397,000 75,800,000
Other capital expenditures   23,000 260,000 26,000
Total capital expenditures (including accrued capital expenditures and capitalized interest)   66,307,000 71,657,000 75,826,000
Operating Segments        
SEGMENT REPORTING        
Revenue   536,618,000 666,295,000 693,524,000
Significant segment expenses:        
Cost of sales (exclusive of transportation costs)   (378,062,000) (422,297,000) (384,205,000)
Transportation costs   (75,327,000) (106,241,000) (105,739,000)
Selling, general, and administrative   (37,296,000) (30,659,000) (32,681,000)
Other segment items   5,179,000 6,139,000 22,299,000
Segment Adjusted EBITDA   51,112,000 113,237,000 193,198,000
Corporate Non segment        
Significant segment expenses:        
Corporate expenses   (11,998,000) (5,916,000) (7,094,000)
Metallurgical Coal        
Significant segment expenses:        
Segment capital expenditures   61,738,000 71,200,000 75,770,000
Metallurgical Coal | Operating Segments        
SEGMENT REPORTING        
Revenue   536,618,000 666,295,000 693,524,000
Significant segment expenses:        
Cost of sales (exclusive of transportation costs)   (378,062,000) (422,297,000) (384,205,000)
Transportation costs   (75,327,000) (106,241,000) (105,739,000)
Selling, general, and administrative   (18,941,000) (25,904,000) (28,426,000)
Other segment items   5,101,000 7,661,000 23,444,000
Segment Adjusted EBITDA   69,389,000 119,514,000 198,598,000
REE & Critical Minerals        
SEGMENT REPORTING        
Revenue   0    
Significant segment expenses:        
Segment capital expenditures   4,546,000 196,000 30,000
REE & Critical Minerals | Operating Segments        
Significant segment expenses:        
Selling, general, and administrative   (18,355,000) (4,755,000) (4,255,000)
Other segment items   78,000 (1,522,000) (1,145,000)
Segment Adjusted EBITDA   $ (18,277,000) $ (6,277,000) $ (5,400,000)