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SEGMENT INFORMATION (Geographic Split of Net Sales and Property, Plant and Equipment ) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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