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SEGMENT INFORMATION - Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Reportable segment results      
Revenues $ 662,922 $ 463,422  
Segment Adjusted EBITDA Expense 339,296 261,456  
Segment Adjusted EBITDA 291,947 173,187  
Total assets 2,787,749 2,293,463 $ 2,728,021
Capital expenditures 95,474 59,153  
Operating segments | Illinois Basin Coal      
Reportable segment results      
Revenues 360,406 274,696  
Segment Adjusted EBITDA Expense 207,069 177,589  
Segment Adjusted EBITDA 132,008 78,215  
Total assets 840,792 704,627  
Capital expenditures 61,982 36,547  
Operating segments | Appalachia Coal      
Reportable segment results      
Revenues 251,259 145,299  
Segment Adjusted EBITDA Expense 125,799 83,715  
Segment Adjusted EBITDA 116,550 51,103  
Total assets 459,834 425,929  
Capital expenditures 32,505 18,345  
Operating segments | Oil & Gas Royalties      
Reportable segment results      
Revenues 35,537 33,520  
Segment Adjusted EBITDA Expense 4,424 3,277  
Segment Adjusted EBITDA 30,045 30,835  
Total assets 768,728 718,710  
Capital expenditures 2    
Operating segments | Coal Royalties      
Reportable segment results      
Revenues 15,513 15,167  
Segment Adjusted EBITDA Expense 5,388 4,819  
Segment Adjusted EBITDA 10,125 10,348  
Total assets 326,064 291,153  
Capital expenditures 400    
Other, Corporate and Elimination      
Reportable segment results      
Revenues 207 (5,260)  
Segment Adjusted EBITDA Expense (3,384) (7,944)  
Segment Adjusted EBITDA 3,219 2,686  
Total assets 392,331 153,044  
Capital expenditures 585 4,261  
Elimination      
Reportable segment results      
Revenues (15,513) (15,167)  
Elimination | Coal Royalties      
Reportable segment results      
Revenues $ 15,513 $ 15,167