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, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 202,600	$ 206,700	$ 198,600	$ 206,800	$ 199,800	$ 192,200	$ 193,700	$ 180,100	$ 194,000	$ 186,700	$ 182,100	$ 174,900	$ 814,696	$ 765,769	$ 737,621
Property, plant and equipment, at cost, net	439,516				481,952				507,440				439,516	481,952	507,440
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													324,143	312,590	305,630
Property, plant and equipment, at cost, net	134,078				141,037				148,578				134,078	141,037	148,578
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													245,562	223,443	212,544
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													61,493	61,410	57,745
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	34,102				40,473				34,556				34,102	40,473	34,556
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													40,422	36,804	37,709
Property, plant and equipment, at cost, net	29,650				34,149				38,329				29,650	34,149	38,329
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													34,977	25,171	14,558
Property, plant and equipment, at cost, net	126,072				133,851				135,239				126,072	133,851	135,239
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales													108,099	106,351	109,435
Property, plant and equipment, at cost, net	62,208				71,387				86,126				62,208	71,387	86,126
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	27,196				28,425				31,021				27,196	28,425	31,021
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, at cost, net	$ 26,210				$ 32,630				$ 33,591				$ 26,210	$ 32,630	$ 33,591