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Inventories
12 Months Ended
Dec. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
 December 31,
 20242023
Raw materials
$99,320 $159,240 
Work in progress
71,175 54,936 
Finished goods
73,994 61,891 
Spares and other
31,948 30,931 
 276,437 306,998 
Reduction to LIFO cost basis
(64,051)(95,167)
Total inventories
$212,386 $211,831 

Substantially all of the Company’s inventories at December 31, 2024 and December 31, 2023 are valued at the lower of cost or market using the LIFO method. However, approximately 7% was valued at average cost using the first-in, first-out (“FIFO”) method at December 31, 2024.

The excess of replacement cost over the carrying value of total inventories subject to LIFO was $57.5 million and $65.3 million at December 31, 2024 and December 31, 2023, respectively.