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, 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
Net sales and long-lived asset information by geographic area
Net Sales	$ 625,895	$ 624,326	$ 617,746	$ 601,316	$ 538,868	$ 589,729	$ 619,999	$ 582,338	$ 2,469,283	$ 2,330,934	$ 2,317,149
Plant, Property & Equipment	867,906				784,321				867,906	784,321	765,383
United States
Net sales and long-lived asset information by geographic area
Net Sales									642,164	619,814	633,522
Plant, Property & Equipment	182,434				175,578				182,434	175,578	175,367
Total Europe
Net sales and long-lived asset information by geographic area
Net Sales									1,426,173	1,329,398	1,287,309
Plant, Property & Equipment	547,795				488,977				547,795	488,977	440,266
France
Net sales and long-lived asset information by geographic area
Net Sales									744,856	695,727	712,470
Plant, Property & Equipment	266,804				228,082				266,804	228,082	216,966
Germany
Net sales and long-lived asset information by geographic area
Net Sales									416,802	386,553	326,782
Plant, Property & Equipment	163,948				154,588				163,948	154,588	125,186
Italy
Net sales and long-lived asset information by geographic area
Net Sales									131,523	126,890	125,511
Plant, Property & Equipment	57,080				51,732				57,080	51,732	43,631
Other Europe
Net sales and long-lived asset information by geographic area
Net Sales									132,992	120,228	122,546
Plant, Property & Equipment	59,963				54,575				59,963	54,575	54,483
Other Foreign Countries
Net sales and long-lived asset information by geographic area
Net Sales									400,946	381,722	396,318
Plant, Property & Equipment	$ 137,677				$ 119,766				$ 137,677	$ 119,766	$ 149,750