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SEGMENT INFORMATION (Geographic Split of Net Sales and Property, Plant and Equipment ) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment      
Net Sales (Note 2) $ 2,655,400 $ 3,003,272 $ 3,028,674
Total property, plant and equipment, net $ 522,092 $ 529,344 $ 478,801
Percentage of LIFO Inventory 35.00% 36.00% 37.00%
United States      
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment      
Net Sales (Note 2) $ 1,431,859 $ 1,615,483 $ 1,554,688
Total property, plant and equipment, net 247,931 250,923 214,943
Other foreign countries      
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment      
Net Sales (Note 2) 1,223,541 1,387,789 1,473,986
Total property, plant and equipment, net 274,214 278,566 264,110
Corporate / Eliminations      
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment      
Total property, plant and equipment, net $ (53) $ (145) $ (252)