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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 563,828 | $ 567,646 | $ 592,418 | $ 550,722 | $ 567,985 | $ 645,166 | $ 664,740 | $ 657,900 | $ 2,274,614 | $ 2,535,791 | $ 2,813,324
Total property, plant and equipment, net | $ 372,377 |  |  |  | $ 411,323 |  |  |  | $ 372,377 | $ 411,323 | $ 438,746
Percentage of LIFO Inventory | 40.00% |  |  |  | 40.00% |  |  |  | 40.00% | 40.00% | 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 |  |  |  |  |  |  |  |  | $ 1,308,635 | $ 1,387,882 | $ 1,417,750
Total property, plant and equipment, net | $ 176,041 |  |  |  | $ 173,974 |  |  |  | 176,041 | 173,974 | 171,746
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 |  |  |  |  |  |  |  |  | 965,979 | 1,147,909 | 1,395,574
Total property, plant and equipment, net | 196,679 |  |  |  | 237,718 |  |  |  | 196,679 | 237,718 | 267,423
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 | $ (343) |  |  |  | $ (369) |  |  |  | $ (343) | $ (369) | $ (423)
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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