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Revenue From Contracts with Customers - Disaggregate Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue
Net sales	$ 280,718	$ 480,390	$ 599,364	$ 955,384
Graphite Electrodes - Three-to-five-year take-or-pay contracts
Disaggregation of Revenue
Net sales	245,010	377,605	521,389	773,645
Graphite Electrodes - Short-term agreements and spot sales
Disaggregation of Revenue
Net sales	30,111	76,249	60,929	123,545
By-products and other
Disaggregation of Revenue
Net sales	$ 5,597	$ 26,536	$ 17,046	$ 58,194

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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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