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Production Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Production Costs [Line Items]    
Materials and consumables $ 414,302 $ 381,446
Employee compensation and benefits expense 310,715 317,081
Contractors 232,096 226,095
Utilities 56,204 48,675
Other expenses 30,843 34,165
Changes in inventories 50,271 (81,983)
Production Costs 1,094,431 925,479
NRV adjustments to inventory $ 97,700 $ 8,700