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Borrowing Arrangements (Details 4)	1 Months Ended	12 Months Ended
Borrowing Arrangements (Details 4)	Apr. 30, 2011 Belgian Loan	Dec. 31, 2011 Belgian Loan EUR (€)	Mar. 31, 2013 Belgian Loan USD ($)	Mar. 31, 2013 Belgian Loan EUR (€)	Dec. 31, 2012 Belgian Loan USD ($)	Dec. 31, 2012 Belgian Loan EUR (€)	Dec. 31, 2011 Belgian Loan Maximum EUR (€)	Mar. 31, 2013 Japanese Term Loan USD ($)	Mar. 31, 2013 Japanese Term Loan JPY (¥)
Long-term Debt
Principal amount							€ 6,000,000	$ 7,700,000	¥ 722,000,000
Bond installment increments for drawing on the loan		120,000
Percentage of plant expansion investment that installment draw downs are based upon		25.00%
Maturity period	7 years
Interest rate (as a percent)			5.35%	5.35%
Amount outstanding			$ 153,000	€ 120,000	$ 158,000	€ 120,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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