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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Outside coal purchases | $ 11,530 |  | $ 15,739 | $ 151
Other expense (income) | (223) | $ (193) | 173 | (1,339)
Segment Adjusted EBITDA Expense | 350,406 | 330,501 | 1,028,136 | 908,379
Product |  |  |  |
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | $ 339,099 | $ 330,694 | $ 1,012,224 | $ 909,567

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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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- Definition Cost of product sold and service rendered, excluding depreciation, depletion, and amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(a)) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(d)) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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