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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of revenues        
Revenues $ 355,651 $ 464,726 $ 961,616 $ 1,508,382
Coal sales        
Disaggregation of revenues        
Revenues 335,767 420,005 886,690 1,357,331
Oil & gas royalties        
Disaggregation of revenues        
Revenues 9,693 13,969 31,718 36,254
Transportation revenues        
Disaggregation of revenues        
Revenues 6,226 20,024 16,722 82,892
Other revenues        
Disaggregation of revenues        
Revenues 3,965 10,728 26,486 31,905
Illinois Basin        
Disaggregation of revenues        
Revenues 210,360 280,335 552,019 965,404
Illinois Basin | Coal sales        
Disaggregation of revenues        
Revenues 206,356 256,293 539,614 875,544
Illinois Basin | Transportation revenues        
Disaggregation of revenues        
Revenues 3,722 18,778 10,731 79,303
Illinois Basin | Other revenues        
Disaggregation of revenues        
Revenues 282 5,264 1,674 10,557
Appalachia        
Disaggregation of revenues        
Revenues 132,310 164,414 367,523 484,062
Appalachia | Coal sales        
Disaggregation of revenues        
Revenues 129,411 162,316 347,076 477,720
Appalachia | Transportation revenues        
Disaggregation of revenues        
Revenues 2,504 1,246 5,991 3,589
Appalachia | Other revenues        
Disaggregation of revenues        
Revenues 395 852 14,456 2,753
Minerals        
Disaggregation of revenues        
Revenues 9,721 14,177 31,831 37,333
Minerals | Oil & gas royalties        
Disaggregation of revenues        
Revenues 9,693 13,969 31,718 36,254
Minerals | Other revenues        
Disaggregation of revenues        
Revenues 28 208 113 1,079
Other and Corporate        
Disaggregation of revenues        
Revenues 6,070 13,123 18,409 43,275
Other and Corporate | Coal sales        
Disaggregation of revenues        
Revenues   5,689   16,530
Other and Corporate | Other revenues        
Disaggregation of revenues        
Revenues 6,070 7,434 18,409 26,745
Elimination        
Disaggregation of revenues        
Revenues (2,810) (7,323) (8,166) (21,692)
Elimination | Coal sales        
Disaggregation of revenues        
Revenues   (4,293)   (12,463)
Elimination | Other revenues        
Disaggregation of revenues        
Revenues (2,810) (3,030) (8,166) (9,229)
Elimination | Illinois Basin        
Disaggregation of revenues        
Revenues   4,293   12,463
Elimination | Other and Corporate        
Disaggregation of revenues        
Revenues $ 2,810 $ 3,030 $ 8,166 $ 9,229