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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of consolidated Segment Adjusted EBITDA Expense
Segment Adjusted EBITDA Expense	$ 952,649	$ 861,249	$ 1,204,896
Outside coal purchases	(6,372)		(23,357)
Other expense	(3,020)	(1,593)	561
Operating expenses (excluding depreciation, depletion and amortization)	$ 943,257	$ 859,656	$ 1,182,100

X

- Definition

Costs incurred during the reporting period for purchased coal.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents the segment adjusted EBITDA expense, including operating expenses, coal purchases and other income. Excludes transportation expenses.

+ References

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+ Details

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X

- 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 http://asc.fasb.org/extlink&oid=123367319&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 http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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- References

No definition available.

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