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Inventories
6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
June 30,
2023
December 31,
2022
Raw materials$125,162 $126,060 
Work in progress73,417 64,669 
Finished goods92,824 60,711 
Spares and other30,894 28,892 
322,297 280,332 
Reduction to LIFO cost basis(96,311)(64,830)
Total inventories$225,986 $215,502 

Substantially all of the Company’s inventories at June 30, 2023 and December 31, 2022 are valued at the lower of cost or market using the last-in, first-out (“LIFO”) method. However, approximately 7% was valued at average cost using the first-in, first-out (“FIFO”) method at June 30, 2023.

The excess of replacement cost over the carrying value of total inventories subject to LIFO was $67.2 million and $58.2 million at June 30, 2023 and December 31, 2022, respectively.