Debt (Schedule Of Debt And Capital Lease Obligations) (Details) In Thousands, unless otherwise specified			3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 31, 2012 Credit Line, Due 2013 [Member] USD ($)		Dec. 31, 2011 Credit Line, Due 2013 [Member] USD ($)		Mar. 31, 2012 Term Loan, Denominated In U.S. Dollars, Due 2013 [Member] USD ($)		Dec. 31, 2011 Term Loan, Denominated In U.S. Dollars, Due 2013 [Member] USD ($)		Mar. 31, 2012 Term Loan, Denominated In Euros ("EUR"), Due 2013 [Member] USD ($)		Dec. 31, 2011 Term Loan, Denominated In Euros ("EUR"), Due 2013 [Member] USD ($)		Mar. 31, 2012 Secured Mortgages [Member] USD ($)		Mar. 31, 2012 Secured Mortgages [Member] EUR (€)	Dec. 31, 2011 Secured Mortgages [Member] USD ($)		Mar. 31, 2012 Capitalized Leases And Other Long-Term Debt [Member] USD ($)	Dec. 31, 2011 Capitalized Leases And Other Long-Term Debt [Member] USD ($)
Debt Instrument [Line Items]
Short-term debt	$ 3,491	$ 2,392
Total long-term debt, including current maturities	400,958	401,433	86,000	[1]	72,000	[1]	250,385	[2]	260,000	[2]	48,081	[3]	50,596	[3]	6,696	[4]	5,019	6,504	[4]	9,796	12,333
Current maturities of long-term debt	86,317	75,300
Long-term debt, less current maturities	$ 314,641	$ 326,133
Applicable rate from interest rate of loan varying with prime, federal funds and/or LIBOR			1.70%				1.80%				1.90%
Average interest rate of loan with prime, federal funds and/or LIBOR			1.50%				1.80%				2.30%

[1] The loans under this facility may be denominated in USD or several foreign currencies. The interest rates under the facility are based on prime, federal funds and/or the London Interbank offer rate ("LIBOR") for the applicable currency. At March 31, 2012, the applicable rate was 1.7% and averaged 1.5% for the three-month period ended March 31, 2012.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At March 31, 2012, the applicable rate was 1.8% and averaged 1.8% for the three-month period ended March 31, 2012.

[3] The interest rate for this loan varies with LIBOR. At March 31, 2012, this rate was 1.9% and averaged 2.3% for the three-month period ended March 31, 2012.

[4] This amount consists of two fixed-rate commercial loans with an outstanding balance of €5,019 at March 31, 2012. The loans are secured by the Company's facility in Bad Neustadt, Germany.