Borrowing Arrangements (Details 3)			3 Months Ended				3 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 U.S. Credit Facility USD ($)	Dec. 31, 2012 U.S. Credit Facility USD ($)	Mar. 31, 2013 U.S. Credit Facility Minimum	Mar. 31, 2013 U.S. Credit Facility Maximum	Mar. 31, 2013 U.S. Credit Facility Overnight federal funds rate	Mar. 31, 2013 U.S. Credit Facility One-month LIBOR	Mar. 31, 2013 U.S. Credit Facility One, two, three, or six-Month LIBOR	Mar. 31, 2013 Letters of credit USD ($)	Mar. 31, 2013 Belgian credit facility USD ($)	Mar. 31, 2013 Belgian credit facility EUR (€)	Dec. 31, 2012 Belgian credit facility EUR (€)	Mar. 31, 2013 United Kingdom credit facility GBP (£)	Dec. 31, 2012 United Kingdom credit facility GBP (£)	Mar. 31, 2013 Japanese working capital loan USD ($)	Mar. 31, 2013 Japanese working capital loan JPY (¥)	Dec. 31, 2012 Japanese working capital loan USD ($)	Dec. 31, 2012 Japanese working capital loan JPY (¥)	Mar. 31, 2013 Chinese Credit Facility USD ($)	Mar. 31, 2013 Chinese Credit Facility CNY	Mar. 31, 2013 Chinese Credit Facility JPY (¥)	Dec. 31, 2012 Chinese Credit Facility USD ($)
Line of Credit Facilities
Borrowing capacity			$ 125,000,000							$ 30,000,000		€ 2,000,000		£ 600,000			¥ 2,000,000,000			$ 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			74,900,000	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
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%
Short-term prime fixed rate on which interest rate is based (as a percent)																1.475%	1.475%
Amount outstanding			47,900,000	44,300,000							0					15,900,000	1,500,000,000	18,600,000	1,600,000,000	200,000		1,100,000	0
Guarantees issued												900,000	1,200,000	400,000	400,000
Long-term debt	$ 48,053,000	$ 44,408,000
Interest rate (as a percent)																				5.88%	5.88%	5.88%