SEGMENT INFORMATION (Summary of Net Sales and Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Net sales and long-lived asset information by geographic area
Net sales	$ 749,329	$ 759,153	$ 699,305	$ 721,553	$ 671,333	$ 701,278	$ 742,661	$ 744,460	$ 2,929,340	$ 2,859,732	$ 2,764,761
Property, plant and equipment	1,198,748				1,087,678				$ 1,198,748	$ 1,087,678	$ 991,613	$ 997,489
Customer Concentration Risk | Net sales
Net sales and long-lived asset information by geographic area
Concentration risk									6.00%	6.00%	6.00%
United States
Net sales and long-lived asset information by geographic area
Net sales									$ 965,986	$ 836,768	$ 726,336
Property, plant and equipment	298,616				300,820				298,616	300,820	265,004
Europe
Net sales and long-lived asset information by geographic area
Net sales									1,604,056	1,638,469	1,627,478
Property, plant and equipment	734,172				619,268				734,172	619,268	577,144
France
Net sales and long-lived asset information by geographic area
Net sales									854,639	895,110	862,364
Property, plant and equipment	426,353				338,288				426,353	338,288	308,250
Germany
Net sales and long-lived asset information by geographic area
Net sales									448,405	452,409	474,369
Property, plant and equipment	194,553				163,782				194,553	163,782	154,505
Italy
Net sales and long-lived asset information by geographic area
Net sales									148,636	141,867	144,044
Property, plant and equipment	57,333				53,562				57,333	53,562	54,978
Other Europe
Net sales and long-lived asset information by geographic area
Net sales									152,376	149,083	146,701
Property, plant and equipment	55,933				63,636				55,933	63,636	59,411
Other Foreign Countries
Net sales and long-lived asset information by geographic area
Net sales									359,298	384,495	410,947
Property, plant and equipment	$ 165,960				$ 167,590				$ 165,960	$ 167,590	$ 149,465