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SEGMENT INFORMATION - Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Reportable segment results          
Revenues $ 641,836 $ 619,878 $ 1,304,758 $ 1,083,300  
Segment Adjusted EBITDA Expense 338,434 316,422 677,730 577,878  
Segment Adjusted EBITDA 269,366 269,333 561,313 442,520  
Total assets 2,787,943 2,400,673 2,787,943 2,400,673 $ 2,728,021
Capital expenditures 89,543 62,829 185,017 121,982  
Operating segments | Illinois Basin Coal          
Reportable segment results          
Revenues 355,392 313,497 715,798 588,193  
Segment Adjusted EBITDA Expense 214,666 194,697 421,735 372,286  
Segment Adjusted EBITDA 119,551 97,352 251,559 175,567  
Total assets 830,821 748,291 830,821 748,291  
Capital expenditures 57,469 35,343 119,451 71,890  
Operating segments | Appalachia Coal          
Reportable segment results          
Revenues 238,242 255,682 489,501 400,981  
Segment Adjusted EBITDA Expense 119,319 117,369 245,118 201,084  
Segment Adjusted EBITDA 109,573 124,377 226,123 175,480  
Total assets 470,929 457,724 470,929 457,724  
Capital expenditures 31,309 22,491 63,814 40,836  
Operating segments | Oil & Gas Royalties          
Reportable segment results          
Revenues 33,412 39,956 68,949 73,476  
Segment Adjusted EBITDA Expense 3,562 3,582 7,986 6,859  
Segment Adjusted EBITDA 29,050 37,638 59,095 68,473  
Total assets 758,816 734,760 758,816 734,760  
Capital expenditures 40   42    
Operating segments | Coal Royalties          
Reportable segment results          
Revenues 16,567 14,525 32,080 29,692  
Segment Adjusted EBITDA Expense 5,597 5,398 10,985 10,217  
Segment Adjusted EBITDA 10,970 9,127 21,095 19,475  
Total assets 322,926 288,509 322,926 288,509  
Capital expenditures     400    
Other, Corporate and Elimination          
Reportable segment results          
Revenues (1,777) (3,782) (1,570) (9,042)  
Segment Adjusted EBITDA Expense (4,710) (4,624) (8,094) (12,568)  
Segment Adjusted EBITDA 222 839 3,441 3,525  
Total assets 404,451 171,389 404,451 171,389  
Capital expenditures 725 4,995 1,310 9,256  
Elimination          
Reportable segment results          
Revenues (16,567) (14,525) (32,080) (29,692)  
Elimination | Coal Royalties          
Reportable segment results          
Revenues $ 16,567 $ 14,525 $ 32,080 $ 29,692