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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

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