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Segment Information - Reconciliation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 227,440	$ 163,701	$ 441,204	$ 390,421
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total revenues	2,681	4,658	9,456	10,040
Mining | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	$ 224,759	$ 159,043	$ 431,748	$ 380,381

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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.

+ References

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