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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
INVENTORIES    
Raw materials $ 155,206 $ 164,440
Work-in-process 157,943 124,351
Finished goods 380,789 344,573
Total $ 693,938 $ 633,364
Percentage of total inventories valued using the LIFO method (as a percent) 38.00% 38.00%
Excess of current cost over LIFO cost $ 139,427 $ 138,589