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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 747,185 | $ 669,491 | $ 626,858 | $ 580,897 | $ 563,828 | $ 567,646 | $ 592,418 | $ 550,772 | $ 2,624,431 | $ 2,274,614 | $ 2,535,791
Total property, plant and equipment, net | $ 477,031 |  |  |  | $ 372,377 |  |  |  | $ 477,031 | $ 372,377 | 411,323
Percentage of LIFO Inventory | 32.00% |  |  |  | 40.00% |  |  |  | 32.00% | 40.00% |
United States |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 1,388,816 | $ 1,308,635 | 1,387,882
Total property, plant and equipment, net | $ 194,491 |  |  |  | $ 176,041 |  |  |  | 194,491 | 176,041 | 173,974
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 |  |  |  |  |  |  |  |  | 1,235,615 | 965,979 | 1,147,909
Total property, plant and equipment, net | 282,931 |  |  |  | 196,679 |  |  |  | 282,931 | 196,679 | 237,718
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 | $ (391) |  |  |  | $ (343) |  |  |  | $ (391) | $ (343) | $ (369)
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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