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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Segment Adjusted EBITDA Expense | $ 239,350 | $ 216,750 | $ 651,571 | $ 638,989
Outside coal purchases | (6,065) |  | (6,179) |
Other expense | (84) | (723) | (2,632) | (1,456)
Product |  |  |  |
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | $ 233,201 | $ 216,027 | $ 642,760 | $ 637,533

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- Definition Represents the segment adjusted EBITDA expense, including operating expenses, coal purchases and other income. Excludes transportation expenses. + References No definition available. + Details
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