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SEGMENT INFORMATION - Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Reportable segment results      
Revenues $ 540,468 $ 651,697  
Segment Adjusted EBITDA Expense 342,648 361,793  
Other segment items 1,308 1,003  
Segment Adjusted EBITDA 181,043 258,359  
Total assets 2,902,735 2,965,787 $ 2,915,730
Capital expenditures 86,776 123,846  
Coal royalties      
Reportable segment results      
Revenues 540,468 651,697  
Transportation      
Reportable segment results      
Revenues 10,200 30,753  
Transportation expenses 10,200 30,753  
Other revenues      
Reportable segment results      
Revenues 25,673 22,035  
Coal Royalties      
Reportable segment results      
Revenues 15,795 18,708  
Operating Segments, Excluding Corporate and Elimination      
Reportable segment results      
Revenues 519,404 633,206  
Operating Segments, Excluding Corporate and Elimination | Illinois Basin Coal      
Reportable segment results      
Revenues 342,995 397,841  
Operating Segments, Excluding Corporate and Elimination | Appalachia Coal      
Reportable segment results      
Revenues 139,496 198,014  
Operating Segments, Excluding Corporate and Elimination | Oil & Gas Royalties      
Reportable segment results      
Revenues 36,913 37,345  
Operating Segments, Excluding Corporate and Elimination | Coal Royalties      
Reportable segment results      
Revenues   6  
Operating Segments      
Reportable segment results      
Revenues 535,199 651,908  
Segment Adjusted EBITDA 181,043 258,359  
Total assets 2,693,306 2,642,828  
Capital expenditures 83,458 122,584  
Operating Segments | Illinois Basin Coal      
Reportable segment results      
Revenues 342,995 397,841  
Segment Adjusted EBITDA Expense 209,959 233,087  
Segment Adjusted EBITDA 126,173 140,278  
Total assets 1,072,545 1,019,209  
Capital expenditures 52,585 96,133  
Operating Segments | Illinois Basin Coal | Transportation      
Reportable segment results      
Revenues 6,863 24,476  
Transportation expenses 6,863 24,476  
Operating Segments | Illinois Basin Coal | Other revenues      
Reportable segment results      
Revenues 2,898 2,735  
Operating Segments | Appalachia Coal      
Reportable segment results      
Revenues 139,496 198,014  
Segment Adjusted EBITDA Expense 120,568 117,502  
Segment Adjusted EBITDA 15,591 74,235  
Total assets 472,957 520,093  
Capital expenditures 30,828 26,451  
Operating Segments | Appalachia Coal | Transportation      
Reportable segment results      
Revenues 3,337 6,277  
Transportation expenses 3,337 6,277  
Operating Segments | Appalachia Coal | Other revenues      
Reportable segment results      
Revenues 882 488  
Operating Segments | Oil & Gas Royalties      
Reportable segment results      
Revenues 36,913 37,345  
Segment Adjusted EBITDA Expense 5,721 4,940  
Other segment items 1,308 1,003  
Segment Adjusted EBITDA 29,884 31,402  
Total assets 834,854 783,309  
Operating Segments | Oil & Gas Royalties | Other revenues      
Reportable segment results      
Revenues 829 315  
Operating Segments | Coal Royalties      
Reportable segment results      
Revenues 15,795 18,708  
Segment Adjusted EBITDA Expense 6,400 6,264  
Segment Adjusted EBITDA 9,395 12,444  
Total assets 312,950 320,217  
Capital expenditures 45    
Operating Segments | Coal Royalties | Coal royalties      
Reportable segment results      
Revenues 15,795 18,702  
Operating Segments | Coal Royalties | Other revenues      
Reportable segment results      
Revenues   6  
Elimination      
Reportable segment results      
Revenues 15,795 18,702  
Elimination | Coal Royalties      
Reportable segment results      
Revenues 15,795 18,702  
Other, Corporate and Elimination      
Reportable segment results      
Revenues (15,795) (18,702)  
Total assets 209,429 322,959  
Capital expenditures 3,318 1,262  
Other, Corporate and Elimination | Other revenues      
Reportable segment results      
Revenues $ 21,064 $ 18,491