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Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	(6.10%)	5.60%	0.60%
Lower effective tax rate on international operations, net	(19.00%)	22.70%	(3.80%)
Depletion	(3.40%)	4.00%	(0.50%)
Exchange gains	0.00%	5.60%	(0.30%)
Provision to return and other adjustments	(20.60%)	3.20%	(0.80%)
Valuation allowance	7.30%	(6.50%)	(1.30%)
Net impact of U.S. tax reform	0.00%	0.00%	(0.90%)
Stock-based compensation	0.00%	11.40%	(1.20%)
Executive compensation limitation	0.60%	(7.30%)	0.30%
R&D credit	(3.80%)	4.80%	(0.40%)
Uncertain tax positions	(0.50%)	(5.60%)	0.20%
Other, net	2.20%	(0.80%)	0.90%
Total effective tax rate	(22.30%)	58.10%	13.80%

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

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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