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Revenue from Contracts with customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [line Items]
Net sales	$ 185,561	$ 363,646	$ 324,363	$ 729,891
Long-term Contract with Customer
Disaggregation of Revenue [line Items]
Net sales	76,369	229,290	146,235	471,771
Short-term Contract with Customer
Disaggregation of Revenue [line Items]
Net sales	101,137	109,194	158,097	217,244
By-products and other
Disaggregation of Revenue [line Items]
Net sales	$ 8,055	$ 25,162	$ 20,031	$ 40,876

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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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