Borrowing Arrangements (Credit Facilities And Other Debt) (Details)	12 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended									3 Months Ended		3 Months Ended			12 Months Ended				3 Months Ended		1 Months Ended	12 Months Ended						12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Mar. 31, 2010 Japanese Credit Facility [Member]	Dec. 31, 2011 Revolving Credit Facility [Member] USD ($)	May 08, 2009 Revolving Credit Facility [Member] USD ($)	Nov. 30, 2009 Belgian Loan [Member] EUR (€)	Dec. 31, 2011 Belgian Loan [Member] USD ($) years	Dec. 31, 2011 Belgian Loan [Member] EUR (€) years	Dec. 31, 2010 Belgian Loan [Member] EUR (€)	Dec. 31, 2011 Belgian Credit Facility [Member] USD ($)	Dec. 31, 2011 Belgian Credit Facility [Member] EUR (€)	Dec. 31, 2010 Belgian Credit Facility [Member] USD ($)	Dec. 31, 2010 Belgian Credit Facility [Member] EUR (€)	Dec. 31, 2011 United Kingdom Credit Facility [Member] GBP (£)	Dec. 31, 2010 United Kingdom Credit Facility [Member] GBP (£)	Mar. 31, 2010 Japanese Credit Facility [Member] JPY (¥)	Dec. 31, 2011 Japanese Credit Facility [Member] USD ($)	Mar. 31, 2010 Japanese Working Capital Loan [Member] JPY (¥)	Dec. 31, 2011 Japanese Working Capital Loan [Member] USD ($)	Dec. 31, 2011 Japanese Working Capital Loan [Member] JPY (¥)	Dec. 31, 2011 Amended Credit Agreement [Member] USD ($)	Dec. 31, 2010 Amended Credit Agreement [Member] USD ($)	Dec. 31, 2011 Amended Credit Agreement [Member] One month LIBOR rate base [Member]	Dec. 31, 2011 Amended Credit Agreement [Member] One, Two, Three, Six Month LIBOR Rate Base [Member]	Mar. 31, 2011 Renewed And Extended [Member] Japanese Working Capital Loan [Member] JPY (¥)	Dec. 31, 2011 Overnight Federal Funds Rate Base [Member] Amended Credit Agreement [Member]	Apr. 30, 2010 Japanese Term Loan [Member] JPY (¥)	Dec. 31, 2011 Japanese Term Loan [Member] JPY (¥)	Dec. 31, 2011 Japanese Term Loan [Member] USD ($)	Mar. 31, 2010 Japanese Term Loan [Member] USD ($)	Mar. 31, 2010 Japanese Term Loan [Member] JPY (¥)	Dec. 31, 2011 Japanese Term Loan [Member] Japanese Credit Facility [Member] USD ($)	Dec. 31, 2011 Japanese Term Loan [Member] Japanese Credit Facility [Member] JPY (¥)	Dec. 31, 2011 Amended Credit Agreement [Member] USD ($)
Line of Credit Facility [Line Items]
Maximum permitted borrowings							€ 6,000,000					€ 1,500,000			£ 600,000		¥ 2,000,000,000		¥ 1,500,000,000							¥ 2,000,000,000
Maturity date of debt instrument					May 8, 2014												March 31, 2013		March 31, 2011							April 4, 2012
Total borrowings under revolving credit facility					125,000,000	95,000,000
Increase in borrowing capacity under the credit agreement					125,000,000
Sublimit available for the issuance of letters of credit					30,000,000
Extended maturity date of the debt instrument					November 17, 2016
Maximum borrowing increase available																																			50,000,000
Variable rate																								2.75%	1.25%		3.00%
Quarterly nonrefundable commitment fee payable																						0.25%
Total availability under the revolving credit facility																						122,800,000
Debt issuance cost																																			200,000
Lines of credit, amount outstanding								200,000	120,000	0	0		0							22,900,000	1,800,000,000	0	0
Drawings from borrowings for expansion							120,000
Percentage of plant expansion expenditures that installment draw downs are based upon							25.00%
Maturity period, years								7	7
Cash collateral shown as restricted cash												750,000
Guarantees issued by bank												1,400,000		1,400,000	400,000	400,000
Principal amount provided by term loan																															7,700,000	722,000,000
Interest rate of notes				1.975%				5.35%	5.35%
Monthly installments on principal amount provided by term loan																												20,000,000
Final payment of loan																													22,000,000
Current debt																													260,000,000	3,300,000
Long-term debt	1,103,000	3,721,000																															800,000	62,000,000
Interest rate on Working Capital Loan																				1.475%	1.475%
Rate of interest on credit facility																											3.25%
Borrowings under facilities								200,000										27,000,000
Other borrowings at fair value	200,000
Liability to make principal payments on debt outstanding in 2012	26,300,000
Liability to make principal payments on debt outstanding in 2013	800,000
Liability to make principal payments on debt outstanding in 2014	28,000
Liability to make principal payments on debt outstanding in 2015	29,000
Liability to make principal payments on debt outstanding in 2016	29,000
Liability to make principal payments on debt outstanding in 2017	28,000
Liability to make principal payments on debt outstanding in 2018	200,000
Interest expense	0	29,000	286,000
Net of interest costs capitalized	$ 1,000,000	$ 400,000	$ 400,000