Segment Reporting Details 3 (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
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 709,699	$ 650,598	$ 608,286	$ 539,674	$ 673,535	$ 604,154	$ 582,057	$ 535,701	$ 2,508,257	$ 2,395,447	$ 2,485,983
Total Segments Property, Plant and Equipment, Net	563,707				517,229				563,707	517,229
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Net Sales									815,153	768,815	708,293
Total Segments Property, Plant and Equipment, Net	168,494				132,255				168,494	132,255
OTHER AMERICAS
Revenues from External Customers and Long-Lived Assets
Net Sales									153,607	157,962	166,150
Total Segments Property, Plant and Equipment, Net	3,833				4,120				3,833	4,120
TOTAL AMERICAS
Revenues from External Customers and Long-Lived Assets
Net Sales									968,760	926,777	874,443
Total Segments Property, Plant and Equipment, Net	172,327				136,375				172,327	136,375
GERMANY
Revenues from External Customers and Long-Lived Assets
Net Sales									182,644	176,491	204,747
Total Segments Property, Plant and Equipment, Net	28,393				29,100				28,393	29,100
FRANCE
Revenues from External Customers and Long-Lived Assets
Net Sales									118,681	110,477	127,363
Total Segments Property, Plant and Equipment, Net	5,009				5,174				5,009	5,174
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Net Sales									61,513	71,679	77,271
Total Segments Property, Plant and Equipment, Net	12,631				15,854				12,631	15,854
SWITZERLAND
Revenues from External Customers and Long-Lived Assets
Net Sales									62,115	64,622	71,347
Total Segments Property, Plant and Equipment, Net	246,312				233,763				246,312	233,763
OTHER EUROPE
Revenues from External Customers and Long-Lived Assets
Net Sales									374,008	349,178	398,645
Total Segments Property, Plant and Equipment, Net	6,511				6,158				6,511	6,158
TOTAL EUROPE
Revenues from External Customers and Long-Lived Assets
Net Sales									798,961	772,447	879,373
Total Segments Property, Plant and Equipment, Net	298,856				290,049				298,856	290,049
CHINA
Revenues from External Customers and Long-Lived Assets
Net Sales									374,996	362,950	404,293
Total Segments Property, Plant and Equipment, Net	83,713				82,528				83,713	82,528
REST OF WORLD
Revenues from External Customers and Long-Lived Assets
Net Sales									365,540	333,273	327,874
Total Segments Property, Plant and Equipment, Net	8,811				8,277				8,811	8,277
TOTAL ASIA REST OF WORLD
Revenues from External Customers and Long-Lived Assets
Net Sales									740,536	696,223	$ 732,167
Total Segments Property, Plant and Equipment, Net	$ 92,524				$ 90,805				$ 92,524	$ 90,805