Segment Reporting Details 3 (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
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 778,031	$ 698,799	$ 653,656	$ 594,567	$ 709,699	$ 650,598	$ 608,286	$ 539,674	$ 2,725,053	$ 2,508,257	$ 2,395,447
Total Segments Property, Plant and Equipment, Net	668,271				563,707				668,271	563,707
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Net Sales									888,241	815,153	768,815
Total Segments Property, Plant and Equipment, Net	220,401				168,494				220,401	168,494
OTHER AMERICAS
Revenues from External Customers and Long-Lived Assets
Net Sales									162,672	153,607	157,962
Total Segments Property, Plant and Equipment, Net	3,406				3,833				3,406	3,833
TOTAL AMERICAS
Revenues from External Customers and Long-Lived Assets
Net Sales									1,050,913	968,760	926,777
Total Segments Property, Plant and Equipment, Net	223,807				172,327				223,807	172,327
GERMANY
Revenues from External Customers and Long-Lived Assets
Net Sales									192,126	182,644	176,491
Total Segments Property, Plant and Equipment, Net	49,376				28,393				49,376	28,393
FRANCE
Revenues from External Customers and Long-Lived Assets
Net Sales									130,427	118,681	110,477
Total Segments Property, Plant and Equipment, Net	6,386				5,009				6,386	5,009
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Net Sales									64,361	61,513	71,679
Total Segments Property, Plant and Equipment, Net	19,617				12,631				19,617	12,631
SWITZERLAND
Revenues from External Customers and Long-Lived Assets
Net Sales									63,090	62,115	64,622
Total Segments Property, Plant and Equipment, Net	259,007				246,312				259,007	246,312
OTHER EUROPE
Revenues from External Customers and Long-Lived Assets
Net Sales									399,923	374,008	349,178
Total Segments Property, Plant and Equipment, Net	8,050				6,511				8,050	6,511
TOTAL EUROPE
Revenues from External Customers and Long-Lived Assets
Net Sales									849,927	798,961	772,447
Total Segments Property, Plant and Equipment, Net	342,436				298,856				342,436	298,856
CHINA
Revenues from External Customers and Long-Lived Assets
Net Sales									439,373	374,996	362,950
Total Segments Property, Plant and Equipment, Net	92,269				83,713				92,269	83,713
REST OF WORLD
Revenues from External Customers and Long-Lived Assets
Net Sales									384,840	365,540	333,273
Total Segments Property, Plant and Equipment, Net	9,759				8,811				9,759	8,811
TOTAL ASIA REST OF WORLD
Revenues from External Customers and Long-Lived Assets
Net Sales									824,213	740,536	$ 696,223
Total Segments Property, Plant and Equipment, Net	$ 102,028				$ 92,524				$ 102,028	$ 92,524