SEGMENT INFORMATION (Geographic Split of Net Sales and Property, Plant and Equipment ) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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%