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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 194,300	$ 194,600	$ 191,900	$ 180,100	$ 197,400	$ 200,300	$ 189,700	$ 200,000	$ 196,300	$ 186,600	$ 185,600	$ 174,500	$ 760,941	$ 787,287	$ 742,887
Property, plant and equipment, at cost, net	420,154				438,953				480,711				420,154	438,953	480,711
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													324,764	306,371	296,265
Property, plant and equipment, at cost, net	137,405				133,651				140,601				137,405	133,651	140,601
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													203,478	245,562	223,443
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													58,755	61,493	61,410
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	38,266				34,102				40,473				38,266	34,102	40,473
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													36,182	40,422	36,804
Property, plant and equipment, at cost, net	27,396				29,650				34,149				27,396	29,650	34,149
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													39,929	34,977	25,171
Property, plant and equipment, at cost, net	114,037				126,072				133,851				114,037	126,072	133,851
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	26,269				27,196				28,425				26,269	27,196	28,425
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	23,397				26,210				32,630				23,397	26,210	32,630
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													97,833	98,462	99,794
Property, plant and equipment, at cost, net	$ 53,384				$ 62,072				$ 70,582				$ 53,384	$ 62,072	$ 70,582