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Segment Information - Reconciliation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 202,467	$ 180,064	$ 643,671	$ 570,485
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total revenues	2,722	4,835	12,178	14,875
Mining | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	$ 199,745	$ 175,229	$ 631,493	$ 555,610

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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