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Unconsolidated Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Income from equity method investee	$ 16,682		$ 16,682		$ 12,371
Variable interest entity, reporting entity involvement, maximum risk of loss	4,700		4,700		5,000
Earnings of unconsolidated operations	$ 15,155	$ 12,754	$ 42,054	$ 37,662
Unconsolidated Subsidiaries
Variable Interest Entity [Line Items]
Ownership percentage	100.00%		100.00%
Other Noncurrent Assets
Variable Interest Entity [Line Items]
Income from equity method investee	$ 16,700		$ 16,700		$ 12,400

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- 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.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

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