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Unconsolidated Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries and related tax positions	$ 29,763		$ 28,978
Variable interest entity, reporting entity involvement, maximum risk of loss	5,900		6,500
Earnings of unconsolidated operations	15,342	$ 16,003
Other noncurrent assets
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries and related tax positions	$ 29,800		$ 29,000

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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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- Definition

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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