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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of revenues        
Revenues $ 362,443 $ 255,202 $ 681,065 $ 605,965
Illinois Basin        
Disaggregation of revenues        
Revenues 218,233 137,787 409,167 341,659
Appalachia        
Disaggregation of revenues        
Revenues 120,723 107,110 229,342 235,213
Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 17,587 7,847 31,607 22,110
Coal Royalties        
Disaggregation of revenues        
Revenues 11,653 6,778 22,954 18,154
Other and Corporate        
Disaggregation of revenues        
Revenues 8,547 4,955 16,315 12,334
Operating segments        
Disaggregation of revenues        
Revenues 362,443 255,202 681,065 605,965
Operating segments | Illinois Basin        
Disaggregation of revenues        
Revenues 218,233 137,787 409,167 341,659
Operating segments | Appalachia        
Disaggregation of revenues        
Revenues 120,723 107,110 229,342 235,213
Operating segments | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 17,587 7,847 31,607 22,110
Operating segments | Coal Royalties        
Disaggregation of revenues        
Revenues       5
Operating segments | Other and Corporate        
Disaggregation of revenues        
Revenues 5,900 2,458 10,949 6,978
Elimination        
Disaggregation of revenues        
Revenues (14,300) (9,275) (28,320) (23,505)
Elimination | Coal Royalties        
Disaggregation of revenues        
Revenues 11,653 6,778 22,954 18,149
Elimination | Other and Corporate        
Disaggregation of revenues        
Revenues 2,647 2,497 5,366 5,356
Coal sales        
Disaggregation of revenues        
Revenues 325,974 236,286 613,461 550,923
Coal sales | Illinois Basin        
Disaggregation of revenues        
Revenues 210,157 134,160 392,798 333,258
Coal sales | Appalachia        
Disaggregation of revenues        
Revenues 115,817 102,126 220,663 217,665
Coal royalties        
Disaggregation of revenues        
Revenues   0    
Coal royalties | Coal Royalties        
Disaggregation of revenues        
Revenues 11,653 6,778 22,954 18,149
Coal royalties | Elimination        
Disaggregation of revenues        
Revenues (11,653) (6,778) (22,954) (18,149)
Oil & gas royalties        
Disaggregation of revenues        
Revenues 17,114 7,786 31,113 22,025
Oil & gas royalties | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 17,114 7,786 31,113 22,025
Transportation revenues        
Disaggregation of revenues        
Revenues 12,058 5,757 23,126 10,496
Transportation revenues | Illinois Basin        
Disaggregation of revenues        
Revenues 7,434 3,153 15,114 7,009
Transportation revenues | Appalachia        
Disaggregation of revenues        
Revenues 4,624 2,604 8,012 3,487
Other revenues        
Disaggregation of revenues        
Revenues 7,297 5,373 13,365 22,521
Other revenues | Illinois Basin        
Disaggregation of revenues        
Revenues 642 474 1,255 1,392
Other revenues | Appalachia        
Disaggregation of revenues        
Revenues 282 2,380 667 14,061
Other revenues | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 473 61 494 85
Other revenues | Coal Royalties        
Disaggregation of revenues        
Revenues       5
Other revenues | Other and Corporate        
Disaggregation of revenues        
Revenues 8,547 4,955 16,315 12,334
Other revenues | Elimination        
Disaggregation of revenues        
Revenues $ (2,647) $ (2,497) $ (5,366) $ (5,356)