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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of revenues      
Revenues $ 1,961,720 $ 2,002,857 $ 1,796,220
Coal sales      
Disaggregation of revenues      
Revenues 1,762,442 1,844,808 1,711,114
Oil & gas royalties      
Disaggregation of revenues      
Revenues 51,735    
Transportation revenues      
Disaggregation of revenues      
Revenues 99,503 112,385 41,700
Other revenues      
Disaggregation of revenues      
Revenues 48,040 45,664 43,406
Illinois Basin      
Disaggregation of revenues      
Revenues 1,236,308 1,321,089 1,125,864
Illinois Basin | Coal sales      
Disaggregation of revenues      
Revenues 1,128,588 1,197,143 1,078,255
Illinois Basin | Transportation revenues      
Disaggregation of revenues      
Revenues 94,686 106,947 35,585
Illinois Basin | Other revenues      
Disaggregation of revenues      
Revenues 13,034 16,999 12,024
Appalachia      
Disaggregation of revenues      
Revenues 644,389 643,965 626,041
Appalachia | Coal sales      
Disaggregation of revenues      
Revenues 628,406 635,530 616,305
Appalachia | Transportation revenues      
Disaggregation of revenues      
Revenues 4,817 5,435 6,115
Appalachia | Other revenues      
Disaggregation of revenues      
Revenues 11,166 3,000 3,621
Minerals      
Disaggregation of revenues      
Revenues 53,036    
Minerals | Oil & gas royalties      
Disaggregation of revenues      
Revenues 51,735    
Minerals | Other revenues      
Disaggregation of revenues      
Revenues 1,301    
Other and Corporate      
Disaggregation of revenues      
Revenues 56,850 81,492 114,749
Other and Corporate | Coal sales      
Disaggregation of revenues      
Revenues 22,138 43,393 74,973
Other and Corporate | Transportation revenues      
Disaggregation of revenues      
Revenues   3  
Other and Corporate | Other revenues      
Disaggregation of revenues      
Revenues 34,712 38,096 39,776
Operating segments      
Disaggregation of revenues      
Revenues 1,961,720 2,002,857 1,796,220
Operating segments | Illinois Basin      
Disaggregation of revenues      
Revenues 1,219,618 1,289,898 1,069,767
Operating segments | Appalachia      
Disaggregation of revenues      
Revenues 644,389 643,898 623,720
Operating segments | Minerals      
Disaggregation of revenues      
Revenues 53,036    
Operating segments | Other and Corporate      
Disaggregation of revenues      
Revenues 44,677 69,061 102,733
Elimination      
Disaggregation of revenues      
Revenues (28,863) (43,689) (70,434)
Elimination | Coal sales      
Disaggregation of revenues      
Revenues (16,690) (31,258) (58,419)
Elimination | Other revenues      
Disaggregation of revenues      
Revenues (12,173) (12,431) (12,015)
Elimination | Illinois Basin      
Disaggregation of revenues      
Revenues 16,690 31,191 56,097
Elimination | Appalachia      
Disaggregation of revenues      
Revenues   67 2,321
Elimination | Other and Corporate      
Disaggregation of revenues      
Revenues $ 12,173 $ 12,431 $ 12,016