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SEGMENT INFORMATION - Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Reportable segment results          
Revenues $ 636,521 $ 632,461 $ 1,941,279 $ 1,715,761  
Segment Adjusted EBITDA Expense 350,406 330,501 1,028,136 908,379  
Segment Adjusted EBITDA 247,657 275,156 808,970 717,676  
Total assets 2,814,041 2,571,386 2,814,041 2,571,386 $ 2,728,021
Capital expenditures 110,339 99,304 295,356 221,286  
Operating segments | Illinois Basin Coal          
Reportable segment results          
Revenues 371,633 335,234 1,087,431 923,427  
Segment Adjusted EBITDA Expense 213,209 194,967 634,944 567,253  
Segment Adjusted EBITDA 132,428 120,760 383,987 296,327  
Total assets 882,943 731,441 882,943 731,441  
Capital expenditures 59,833 39,529 179,284 111,419  
Operating segments | Appalachia Coal          
Reportable segment results          
Revenues 215,800 245,724 705,301 646,705  
Segment Adjusted EBITDA Expense 131,997 134,672 377,115 335,756  
Segment Adjusted EBITDA 74,832 102,012 300,955 277,492  
Total assets 459,742 428,000 459,742 428,000  
Capital expenditures 30,304 17,780 94,119 58,616  
Operating segments | Oil & Gas Royalties          
Reportable segment results          
Revenues 36,311 41,613 105,260 115,089  
Segment Adjusted EBITDA Expense 3,873 3,926 11,859 10,785  
Segment Adjusted EBITDA 31,366 39,429 90,461 107,902  
Total assets 767,415 756,879 767,415 756,879  
Operating segments | Coal Royalties          
Reportable segment results          
Revenues 16,763 16,708 48,843 46,400  
Segment Adjusted EBITDA Expense 6,851 5,545 17,836 15,762  
Segment Adjusted EBITDA 9,912 11,163 31,007 30,638  
Total assets 319,930 325,498 319,930 325,498  
Capital expenditures   40,033 400 40,033  
Other, Corporate and Elimination          
Reportable segment results          
Revenues (3,986) (6,818) (5,556) (15,860)  
Segment Adjusted EBITDA Expense (5,524) (8,609) (13,618) (21,177)  
Segment Adjusted EBITDA (881) 1,792 2,560 5,317  
Total assets 384,011 329,568 384,011 329,568  
Capital expenditures 20,202 1,962 21,553 11,218  
Elimination          
Reportable segment results          
Revenues (16,763) (16,708) (48,843) (46,400)  
Elimination | Coal Royalties          
Reportable segment results          
Revenues $ 16,763 $ 16,708 $ 48,843 $ 46,400