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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Segment Adjusted EBITDA Expense | $ 316,074 | $ 214,504 | $ 577,254 | $ 412,221
Outside coal purchases | (151) | (114) | (151) | (114)
Other income (expense) | 579 | (1,351) | 1,145 | (2,548)
Product |  |  |  |
Reconciliation of consolidated Segment Adjusted EBITDA Expense |  |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | $ 316,502 | $ 213,039 | $ 578,248 | $ 409,559

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(a)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(d)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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