Reportable Segments and Geographic Data (Schedule of Financial Data by Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 191,600	$ 179,900	$ 193,500	$ 180,300	$ 189,600	$ 183,100	$ 198,000	$ 186,700	$ 194,300	$ 194,600	$ 191,900	$ 180,100	$ 745,345	$ 757,414	$ 760,941
Property, plant and equipment, net	395,113				418,830				420,154				395,113	418,830	420,154
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													324,750	338,729	324,764
Property, plant and equipment, net	168,848				162,380				137,405				168,848	162,380	137,405
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													184,022	190,035	203,478
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													59,332	62,076	58,755
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													52,822	43,265	39,929
Property, plant and equipment, net	93,182				103,109				114,037				93,182	103,109	114,037
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													27,431	24,938	26,117
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													26,654	21,557	21,487
Property, plant and equipment, net	25,091				15,893				12,296				25,091	15,893	12,296
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	23,473				35,542				38,266				23,473	35,542	38,266
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	22,222				25,246				26,269				22,222	25,246	26,269
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	18,236				22,434				27,396				18,236	22,434	27,396
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													70,334	76,814	86,411
Property, plant and equipment, net	$ 44,061				$ 54,226				$ 64,485				$ 44,061	$ 54,226	$ 64,485