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SEGMENT INFORMATION (Geographic Split of Net Sales and Property, Plant and Equipment ) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 736,307 | $ 730,783 | $ 777,008 | $ 759,174 | $ 743,827 | $ 737,099 | $ 790,052 | $ 757,696 | $ 3,003,272 | $ 3,028,674 | $ 2,624,431
Total property, plant and equipment, net | $ 529,344 |  |  |  | $ 478,801 |  |  |  | $ 529,344 | $ 478,801 | $ 477,031
Percentage of LIFO Inventory | 36.00% |  |  |  | 37.00% |  |  |  | 36.00% | 37.00% | 32.00%
United States |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 1,615,483 | $ 1,554,688 | $ 1,388,816
Total property, plant and equipment, net | $ 250,923 |  |  |  | $ 214,943 |  |  |  | 250,923 | 214,943 | 194,491
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 |  |  |  |  |  |  |  |  | 1,387,789 | 1,473,986 | 1,235,615
Total property, plant and equipment, net | 278,566 |  |  |  | 264,110 |  |  |  | 278,566 | 264,110 | 282,931
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 | $ (145) |  |  |  | $ (252) |  |  |  | $ (145) | $ (252) | $ (391)
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%

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