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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 15, 2020 employee | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Reportable segment results |  |  |  |  |  |
Revenues |  | $ 355,651 | $ 464,726 | $ 961,616 | $ 1,508,382 |
Segment Adjusted EBITDA Expense |  | 216,750 | 289,081 | 638,989 | 911,535 |
Segment Adjusted EBITDA |  | 132,701 | 156,163 | 306,458 | 528,070 |
Total assets |  | 2,231,340 | 2,627,089 | 2,231,340 | 2,627,089 | $ 2,586,694
Capital expenditures |  | 18,575 | 75,515 | 102,820 | 241,142 |
Gibson County mining complex |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Number of employees terminated | employee | 116 |  |  |  |  |
Hamilton mining complex |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Number of employees terminated | employee | 78 |  |  |  |  |
Illinois Basin |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 210,360 | 280,335 | 552,019 | 965,404 |
Segment Adjusted EBITDA Expense |  | 125,021 | 173,779 | 383,486 | 579,510 |
Segment Adjusted EBITDA |  | 81,617 | 87,780 | 157,803 | 306,592 |
Total assets |  | 1,082,992 | 1,418,008 | 1,082,992 | 1,418,008 |
Capital expenditures |  | 3,815 | 49,829 | 44,073 | 157,759 |
Appalachia |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 132,310 | 164,414 | 367,523 | 484,062 |
Segment Adjusted EBITDA Expense |  | 86,447 | 107,990 | 240,116 | 312,861 |
Segment Adjusted EBITDA |  | 43,358 | 55,178 | 121,416 | 167,612 |
Total assets |  | 470,261 | 493,133 | 470,261 | 493,133 |
Capital expenditures |  | 14,541 | 25,056 | 57,798 | 79,389 |
Minerals |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 9,721 | 14,177 | 31,831 | 37,333 |
Segment Adjusted EBITDA Expense |  | 849 | 2,517 | 2,851 | 6,109 |
Segment Adjusted EBITDA |  | 8,898 | 12,202 | 29,534 | 32,432 |
Total assets |  | 616,491 | 647,480 | 616,491 | 647,480 |
Other and Corporate |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 6,070 | 13,123 | 18,409 | 43,275 |
Segment Adjusted EBITDA Expense |  | 4,908 | 9,878 | 13,697 | 28,026 |
Segment Adjusted EBITDA |  | 1,163 | 3,243 | 4,710 | 28,155 |
Total assets |  | 468,590 | 561,171 | 468,590 | 561,171 |
Capital expenditures |  | 219 | 630 | 949 | 3,994 |
Operating segments |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 355,651 | 464,726 | 961,616 | 1,508,382 |
Operating segments | Illinois Basin |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 210,360 | 276,042 | 552,019 | 952,941 |
Operating segments | Appalachia |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 132,310 | 164,414 | 367,523 | 484,062 |
Operating segments | Minerals |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 9,721 | 14,177 | 31,831 | 37,333 |
Operating segments | Other and Corporate |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | 3,260 | 10,093 | 10,243 | 34,046 |
Elimination |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | (2,810) | (7,323) | (8,166) | (21,692) |
Segment Adjusted EBITDA Expense |  | (475) | (5,083) | (1,161) | (14,971) |
Segment Adjusted EBITDA |  | (2,335) | (2,240) | (7,005) | (6,721) |
Total assets |  | (406,994) | (492,703) | (406,994) | (492,703) |
Elimination | Illinois Basin |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  |  | 4,293 |  | 12,463 |
Elimination | Other and Corporate |  |  |  |  |  |
Reportable segment results |  |  |  |  |  |
Revenues |  | $ 2,810 | $ 3,030 | $ 8,166 | $ 9,229 |

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