Reportable Segments and Geographic Data (Schedule of Financial Data 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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 226,700	$ 222,100	$ 215,600	$ 199,300	$ 213,000	$ 191,300	$ 203,200	$ 172,300	$ 177,500	$ 178,800	$ 172,300	$ 181,300	$ 863,717	$ 779,839	$ 709,868
Property, plant and equipment, net	454,302				422,564				357,470				454,302	422,564	357,470
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													459,525	396,238	323,399
Property, plant and equipment, net	252,639				245,626				172,372				252,639	245,626	172,372
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													147,601	145,479	159,804
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													60,535	60,287	58,846
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													48,920	48,043	48,490
Property, plant and equipment, net	61,840				65,987				80,786				61,840	65,987	80,786
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													57,195	42,862	26,081
Property, plant and equipment, net	58,196				42,272				28,539				58,196	42,272	28,539
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													31,902	27,526	30,581
Property, plant and equipment, net	22,981				7,781				5,264				22,981	7,781	5,264
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													58,039	59,404	62,667
Property, plant and equipment, net	19,602				19,267				19,524				19,602	19,267	19,524
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	14,558				15,585				19,095				14,558	15,585	19,095
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	14,256				14,591				19,029				14,256	14,591	19,029
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 10,230				$ 11,455				$ 12,861				$ 10,230	$ 11,455	$ 12,861