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INVENTORY (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INVENTORY      
Raw materials $ 111,888 $ 116,716  
Work-in-process 60,341 63,744  
Finished goods 209,029 213,288  
Inventories, net $ 381,258 $ 393,748  
Percentage of total inventories valued using the LIFO method (as a percent) 35.00% 36.00% 37.00%
Excess of current cost over LIFO cost $ 75,581 $ 75,292