Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Income Taxes
Income tax provision (benefit) at statutory rate	$ 57,188	$ (1,189)
Percentage depletion and other permanent items	(10,185)	1,660
State taxes, net of effect of federal taxes	1,215	(292)
Change in valuation allowance	(48,133)	412
Current expense associated with uncertain tax positions	376	361
Other, net	(6)	(574)
Provision for income taxes	$ 455	$ 378

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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