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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of revenues    
Revenues $ 460,863 $ 318,622
Illinois Basin    
Disaggregation of revenues    
Revenues 274,696 190,934
Appalachia    
Disaggregation of revenues    
Revenues 145,299 108,619
Oil & Gas Royalties    
Disaggregation of revenues    
Revenues 30,961 14,020
Coal Royalties    
Disaggregation of revenues    
Revenues 15,167 11,301
Other, Corporate and Elimination    
Disaggregation of revenues    
Revenues (5,260) (6,252)
Coal sales    
Disaggregation of revenues    
Revenues 388,360 287,487
Coal sales | Illinois Basin    
Disaggregation of revenues    
Revenues 253,905 182,641
Coal sales | Appalachia    
Disaggregation of revenues    
Revenues 134,455 104,846
Oil & gas royalties    
Disaggregation of revenues    
Revenues 30,927 13,999
Oil & gas royalties | Oil & Gas Royalties    
Disaggregation of revenues    
Revenues 30,927 13,999
Coal royalties | Coal Royalties    
Disaggregation of revenues    
Revenues 15,167 11,301
Coal royalties | Other, Corporate and Elimination    
Disaggregation of revenues    
Revenues (15,167) (11,301)
Transportation    
Disaggregation of revenues    
Revenues 29,372 11,068
Transportation | Illinois Basin    
Disaggregation of revenues    
Revenues 18,891 7,680
Transportation | Appalachia    
Disaggregation of revenues    
Revenues 10,481 3,388
Other revenues    
Disaggregation of revenues    
Revenues 12,204 6,068
Other revenues | Illinois Basin    
Disaggregation of revenues    
Revenues 1,900 613
Other revenues | Appalachia    
Disaggregation of revenues    
Revenues 363 385
Other revenues | Oil & Gas Royalties    
Disaggregation of revenues    
Revenues 34 21
Other revenues | Other, Corporate and Elimination    
Disaggregation of revenues    
Revenues $ 9,907 $ 5,049