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Unconsolidated Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries and related tax positions	$ 19,312		$ 19,312		$ 28,978
Variable interest entity, reporting entity involvement, maximum risk of loss	5,800		5,800		6,500
Earnings of unconsolidated operations	17,652	$ 15,145	46,536	$ 44,926
Contract termination settlement	10,333	$ 0	10,333	$ 0
Coal Mining | Bisti
Variable Interest Entity [Line Items]
Contract termination settlement			10,300
Other noncurrent assets
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries and related tax positions	$ 19,300		$ 19,300		$ 29,000

X

- Definition

This item represents the entity's proportionate share for the period of the pre-tax earnings of the unconsolidated mines to which the equity method of accounting is applied. Income tax amounts are included in the income tax provision line.

+ References

No definition available.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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