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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of revenues        
Revenues $ 255,202 $ 517,054 $ 605,965 $ 1,043,656
Coal sales        
Disaggregation of revenues        
Revenues 236,286 461,310 550,923 937,326
Oil & gas royalties        
Disaggregation of revenues        
Revenues 7,786 11,892 22,025 22,285
Transportation revenues        
Disaggregation of revenues        
Revenues 5,757 32,630 10,496 62,868
Other revenues        
Disaggregation of revenues        
Revenues 5,373 11,222 22,521 21,177
Illinois Basin        
Disaggregation of revenues        
Revenues 137,787 335,673 341,659 685,069
Illinois Basin | Coal sales        
Disaggregation of revenues        
Revenues 134,160 301,981 333,258 619,251
Illinois Basin | Transportation revenues        
Disaggregation of revenues        
Revenues 3,153 31,287 7,009 60,525
Illinois Basin | Other revenues        
Disaggregation of revenues        
Revenues 474 2,405 1,392 5,293
Appalachia        
Disaggregation of revenues        
Revenues 107,110 160,244 235,213 319,648
Appalachia | Coal sales        
Disaggregation of revenues        
Revenues 102,126 157,951 217,665 315,404
Appalachia | Transportation revenues        
Disaggregation of revenues        
Revenues 2,604 1,343 3,487 2,343
Appalachia | Other revenues        
Disaggregation of revenues        
Revenues 2,380 950 14,061 1,901
Minerals        
Disaggregation of revenues        
Revenues 7,847 12,428 22,110 23,156
Minerals | Oil & gas royalties        
Disaggregation of revenues        
Revenues 7,786 11,892 22,025 22,285
Minerals | Other revenues        
Disaggregation of revenues        
Revenues 61 536 85 871
Other and Corporate        
Disaggregation of revenues        
Revenues 4,955 15,990 12,339 30,152
Other and Corporate | Coal sales        
Disaggregation of revenues        
Revenues   5,551   10,841
Other and Corporate | Other revenues        
Disaggregation of revenues        
Revenues 4,955 10,439 12,339 19,311
Elimination        
Disaggregation of revenues        
Revenues (2,497) (7,281) (5,356) (14,369)
Elimination | Coal sales        
Disaggregation of revenues        
Revenues   (4,173)   (8,170)
Elimination | Other revenues        
Disaggregation of revenues        
Revenues (2,497) (3,108) (5,356) (6,199)
Elimination | Illinois Basin        
Disaggregation of revenues        
Revenues   4,173   8,170
Elimination | Other and Corporate        
Disaggregation of revenues        
Revenues $ 2,497 $ 3,108 $ 5,356 $ 6,199