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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of revenues        
Revenues $ 636,521 $ 632,461 $ 1,941,279 $ 1,715,761
Coal sales        
Disaggregation of revenues        
Revenues 549,123 550,563 1,688,238 1,470,730
Oil & gas royalties        
Disaggregation of revenues        
Revenues 34,125 38,695 101,709 111,378
Transportation        
Disaggregation of revenues        
Revenues 34,964 28,548 95,729 93,305
Other revenues        
Disaggregation of revenues        
Revenues 18,309 14,655 55,603 40,348
Operating segments | Illinois Basin Coal        
Disaggregation of revenues        
Revenues 371,633 335,234 1,087,431 923,427
Operating segments | Illinois Basin Coal | Coal sales        
Disaggregation of revenues        
Revenues 342,744 314,271 1,011,467 858,565
Operating segments | Illinois Basin Coal | Transportation        
Disaggregation of revenues        
Revenues 25,992 19,508 68,498 59,848
Operating segments | Illinois Basin Coal | Other revenues        
Disaggregation of revenues        
Revenues 2,897 1,455 7,466 5,014
Operating segments | Appalachia Coal        
Disaggregation of revenues        
Revenues 215,800 245,724 705,301 646,705
Operating segments | Appalachia Coal | Coal sales        
Disaggregation of revenues        
Revenues 206,379 236,292 676,771 612,165
Operating segments | Appalachia Coal | Transportation        
Disaggregation of revenues        
Revenues 8,972 9,040 27,231 33,457
Operating segments | Appalachia Coal | Other revenues        
Disaggregation of revenues        
Revenues 449 392 1,299 1,083
Operating segments | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 36,311 41,613 105,260 115,089
Operating segments | Oil & Gas Royalties | Oil & gas royalties        
Disaggregation of revenues        
Revenues 34,125 38,695 101,709 111,378
Operating segments | Oil & Gas Royalties | Other revenues        
Disaggregation of revenues        
Revenues 2,186 2,918 3,551 3,711
Operating segments | Coal Royalties        
Disaggregation of revenues        
Revenues 16,763 16,708 48,843 46,400
Operating segments | Coal Royalties | Coal royalties        
Disaggregation of revenues        
Revenues 16,763 16,708 48,843 46,400
Other, Corporate and Elimination        
Disaggregation of revenues        
Revenues (3,986) (6,818) (5,556) (15,860)
Other, Corporate and Elimination | Coal royalties        
Disaggregation of revenues        
Revenues (16,763) (16,708) (48,843) (46,400)
Other, Corporate and Elimination | Other revenues        
Disaggregation of revenues        
Revenues 12,777 9,890 43,287 30,540
Elimination        
Disaggregation of revenues        
Revenues (16,763) (16,708) (48,843) (46,400)
Elimination | Coal Royalties        
Disaggregation of revenues        
Revenues $ 16,763 $ 16,708 $ 48,843 $ 46,400