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Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Inventory Disclosure [Abstract]
Coal	$ 96,311	$ 24,185
Raw materials, parts, supplies and other, net	44,107	35,434
Total inventories, net	$ 140,418	$ 59,619	$ 140,418

X

- Definition

Inventory, Raw Materials, Purchased Parts, Supplies and Other, Net of Reserve

+ References

No definition available.

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X

- Definition

Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- References

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
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-Section 55
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