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Revenue From Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue
Net sales	$ 330,750	$ 280,718	$ 635,147	$ 599,364
Contract with Customer, Asset, Allowance for Credit Loss, Current	1,800		1,800		$ 1,500
Graphite Electrodes - Three-to-five-year take-or-pay contracts
Disaggregation of Revenue
Net sales	253,589	245,010	499,154	521,389
Graphite Electrodes - Short-term agreements and spot sales
Disaggregation of Revenue
Net sales	65,204	30,111	112,459	60,929
By-products and other
Disaggregation of Revenue
Net sales	$ 11,957	$ 5,597	$ 23,534	$ 17,046

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- Definition

Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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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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