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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of revenues        
Revenues $ 415,439 $ 355,651 $ 1,096,504 $ 961,616
Illinois Basin        
Disaggregation of revenues        
Revenues 231,093 210,319 640,260 551,978
Appalachia        
Disaggregation of revenues        
Revenues 154,944 132,310 384,286 367,523
Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 21,191 9,721 52,798 31,831
Coal Royalties        
Disaggregation of revenues        
Revenues 13,456 11,448 36,410 29,602
Other and Corporate        
Disaggregation of revenues        
Revenues (5,245) (8,147) (17,250) (19,318)
Operating segments        
Disaggregation of revenues        
Revenues 415,439 355,651 1,096,504 961,616
Operating segments | Illinois Basin        
Disaggregation of revenues        
Revenues 231,093 210,319 640,260 551,978
Operating segments | Appalachia        
Disaggregation of revenues        
Revenues 154,944 132,310 384,286 367,523
Operating segments | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 21,191 9,721 52,798 31,831
Operating segments | Coal Royalties        
Disaggregation of revenues        
Revenues   42   47
Elimination | Coal Royalties        
Disaggregation of revenues        
Revenues 13,456 11,406 36,410 29,555
Coal sales        
Disaggregation of revenues        
Revenues 362,264 335,767 975,725 886,690
Coal sales | Illinois Basin        
Disaggregation of revenues        
Revenues 217,637 206,356 610,435 539,614
Coal sales | Appalachia        
Disaggregation of revenues        
Revenues 144,627 129,411 365,290 347,076
Coal royalties | Coal Royalties        
Disaggregation of revenues        
Revenues 13,456 11,406 36,410 29,555
Coal royalties | Other and Corporate        
Disaggregation of revenues        
Revenues (13,456) (11,406) (36,410) (29,555)
Oil & gas royalties        
Disaggregation of revenues        
Revenues 20,109 9,693 51,222 31,718
Oil & gas royalties | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 20,109 9,693 51,222 31,718
Transportation        
Disaggregation of revenues        
Revenues 22,027 6,226 45,153 16,722
Transportation | Illinois Basin        
Disaggregation of revenues        
Revenues 12,121 3,722 27,235 10,731
Transportation | Appalachia        
Disaggregation of revenues        
Revenues 9,906 2,504 17,918 5,991
Other revenues        
Disaggregation of revenues        
Revenues 11,039 3,965 24,404 26,486
Other revenues | Illinois Basin        
Disaggregation of revenues        
Revenues 1,335 241 2,590 1,633
Other revenues | Appalachia        
Disaggregation of revenues        
Revenues 411 395 1,078 14,456
Other revenues | Oil & Gas Royalties        
Disaggregation of revenues        
Revenues 1,082 28 1,576 113
Other revenues | Coal Royalties        
Disaggregation of revenues        
Revenues   42   47
Other revenues | Other and Corporate        
Disaggregation of revenues        
Revenues $ 8,211 $ 3,259 $ 19,160 $ 10,237