Reportable Segments and Geographic Data (Schedule of Financial Data by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 251,600	$ 251,900	$ 255,400	$ 223,600	$ 226,700	$ 222,100	$ 215,600	$ 199,300	$ 213,000	$ 191,300	$ 203,200	$ 172,300	$ 982,479	$ 863,717	$ 779,839
Property, plant and equipment, net	462,055				454,302				422,564				462,055	454,302	422,564
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													519,349	459,525	396,238
Property, plant and equipment, net	272,584				252,639				245,626				272,584	252,639	245,626
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													157,339	147,601	145,479
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													85,386	57,195	42,862
Property, plant and equipment, net	50,245				58,196				42,272				50,245	58,196	42,272
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													62,093	60,535	60,287
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													50,923	48,920	48,043
Property, plant and equipment, net	48,686				61,840				65,987				48,686	61,840	65,987
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													48,534	31,902	27,526
Property, plant and equipment, net	40,343				22,981				7,781				40,343	22,981	7,781
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													58,855	58,039	59,404
Property, plant and equipment, net	17,605				19,602				19,267				17,605	19,602	19,267
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	12,396				14,558				15,585				12,396	14,558	15,585
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	12,042				14,256				14,591				12,042	14,256	14,591
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 8,154				$ 10,230				$ 11,455				$ 8,154	$ 10,230	$ 11,455