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Revenue From Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue
Net sales	$ 304,397	$ 318,646
Contract with Customer, Asset, Allowance for Credit Loss, Current	1,600		$ 1,500
Graphite Electrodes - Three-to-five-year take-or-pay contracts
Disaggregation of Revenue
Net sales	245,565	276,379
Graphite Electrodes - Short-term agreements and spot sales
Disaggregation of Revenue
Net sales	47,255	30,818
By-products and other
Disaggregation of Revenue
Net sales	$ 11,577	$ 11,449

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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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