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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Segment Adjusted EBITDA Expense | $ 330,106 | $ 239,350 | $ 907,360 | $ 651,571
Outside coal purchases |  | (6,065) | (151) | (6,179)
Other income (expense) | 192 | (84) | 1,337 | (2,632)
Product |  |  |  |
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | $ 330,298 | $ 233,201 | $ 908,546 | $ 642,760

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