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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of revenues |  |  |
Revenues | $ 1,569,976 | $ 1,328,129 | $ 1,961,720
Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 919,597 | 769,957 | 1,236,291
Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 545,539 | 500,330 | 644,389
Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 77,185 | 43,141 | 53,036
Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 51,471 | 42,217 | 57,760
Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (23,816) | (27,516) | (29,756)
Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,386,923 | 1,232,272 | 1,762,442
Coal sales | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 873,930 | 755,208 | 1,128,588
Coal sales | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 512,993 | 477,064 | 628,406
Coal sales | Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues |  |  | 5,448
Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 74,988 | 42,912 | 51,735
Oil & gas royalties | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 74,988 | 42,912 | 51,735
Coal royalties | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 51,402 | 42,112 | 57,737
Coal royalties | Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (51,402) | (42,112) | (57,737)
Transportation revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 69,607 | 21,129 | 99,503
Transportation revenues | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 41,001 | 12,817 | 94,686
Transportation revenues | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 28,606 | 8,312 | 4,817
Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 38,458 | 31,816 | 48,040
Other revenues | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 4,666 | 1,932 | 13,017
Other revenues | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 3,940 | 14,954 | 11,166
Other revenues | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,197 | 229 | 1,301
Other revenues | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 69 | 105 | 23
Other revenues | Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | $ 27,586 | $ 14,596 | $ 22,533

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