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Revenue From Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue
Net sales	$ 286,987	$ 420,797	$ 886,351	$ 1,376,181
Graphite Electrodes - Three-to-five-year take-or-pay contracts
Disaggregation of Revenue
Net sales	250,011	334,097	771,400	1,107,742
Graphite Electrodes - Short-term agreements and spot sales
Disaggregation of Revenue
Net sales	32,303	67,704	93,232	191,249
By-products and other
Disaggregation of Revenue
Net sales	$ 4,673	$ 18,996	$ 21,719	$ 77,190

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Amount, excluding 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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