Borrowing Arrangements (Details 3)			6 Months Ended				6 Months Ended											6 Months Ended					6 Months Ended
	Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2013 U.S. Credit Facility USD ($)	Dec. 31, 2012 U.S. Credit Facility USD ($)	Jun. 30, 2013 U.S. Credit Facility Minimum	Jun. 30, 2013 U.S. Credit Facility Maximum	Jun. 30, 2013 U.S. Credit Facility Overnight federal funds rate	Jun. 30, 2013 U.S. Credit Facility One-month LIBOR	Jun. 30, 2013 U.S. Credit Facility One, two, three, or six-Month LIBOR	Jun. 30, 2013 Letters of credit USD ($)	Jun. 30, 2013 Belgian credit facility EUR (€)	Dec. 31, 2012 Belgian credit facility EUR (€)	Jun. 30, 2013 United Kingdom credit facility GBP (£)	Dec. 31, 2012 United Kingdom credit facility GBP (£)	Jun. 30, 2013 Japanese Term Loan Due May 10, 2017 USD ($)	Jun. 30, 2013 Japanese Term Loan Due May 10, 2017 JPY (¥)	May 10, 2013 Japanese Term Loan Due May 10, 2017 JPY (¥)	Jun. 30, 2013 Japanese Term Loan Due May 10, 2017 Uncollateralized Overnight Call Rate	Jun. 30, 2013 Japanese working capital loan USD ($)	Jun. 30, 2013 Japanese working capital loan JPY (¥)	Dec. 31, 2012 Japanese working capital loan USD ($)	Dec. 31, 2012 Japanese working capital loan JPY (¥)	Jun. 30, 2013 Japanese working capital loan Short-term Prime Rate	Jun. 30, 2013 China Credit Facility USD ($)	Jun. 30, 2013 China Credit Facility CNY	Dec. 31, 2012 China Credit Facility USD ($)	Dec. 31, 2012 China Credit Facility CNY
Line of Credit Facilities
Borrowing capacity			$ 125,000,000							$ 30,000,000	€ 2,000,000		£ 600,000				¥ 1,000,000,000			¥ 1,500,000,000				$ 1,600,000	10,000,000
Aggregate increase in borrowing capacity that may be requested			50,000,000
Quarterly nonrefundable commitment fee payable (as a percent)			0.25%
Total availability under the revolving credit facility			77,100,000	78,600,000
Basis for variable interest rate							weighted average of the rates on overnight federal funds transactions	daily LIBOR	one, two, three or six month LIBOR									Uncollateralized Overnight Call Rate					Short-term Prime Rate
Percentage points added to base to calculate variable rate							3.00%	2.75%	1.25%
Rate of interest at balance sheet date (as a percent)					1.25%	1.45%												0.70%					1.475%	5.32%	5.32%
Amount outstanding			45,700,000	44,300,000							0	0			10,200,000	1,000,000,000			0	0	18,600,000	1,600,000,000		100,000	400,000	0	0
Guarantees issued											1,000,000	1,200,000	400,000	400,000
Long-term debt	$ 56,049,000	$ 44,408,000