Debt (Schedule Of Debt And Capital Lease Obligations) (Details)	0 Months Ended			12 Months Ended						12 Months Ended				0 Months Ended
	May 02, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 Credit Line, Due 2013 [Member] USD ($)		Dec. 31, 2011 Term Loan, Denominated In U.S. Dollars [Member] USD ($)		Dec. 31, 2010 Term Loan, Denominated In U.S. Dollars [Member] USD ($)		Dec. 31, 2011 Term Loan, Denominated In Euros ("EUR") [Member] USD ($)		Dec. 31, 2010 Term Loan, Denominated In Euros ("EUR") [Member] USD ($)		May 02, 2011 Senior Subordinated Notes at 8%, Due 2013 [Member] USD ($)	Dec. 31, 2011 Senior Subordinated Notes at 8%, Due 2013 [Member]	Dec. 31, 2010 Senior Subordinated Notes at 8%, Due 2013 [Member] USD ($)		Dec. 31, 2011 Capitalized Leases And Other Long-Term Debt [Member] USD ($)	Dec. 31, 2010 Capitalized Leases And Other Long-Term Debt [Member] USD ($)	Dec. 31, 2011 Secured Mortgages [Member] USD ($)		Dec. 31, 2011 Secured Mortgages [Member] EUR (€)	Dec. 31, 2010 Secured Mortgages [Member] USD ($)
Debt Instrument [Line Items]
Short-term debt		$ 2,392,000	$ 7,440,000
Total long-term debt, including current maturities		401,433,000	280,470,000	72,000,000	[1]	260,000,000	[2]	75,000,000	[2]	50,596,000	[3]	65,250,000	[3]			125,000,000	[4]	12,333,000	7,898,000	6,504,000	[5]	5,019,000	7,322,000	[5]
Current maturities of long-term debt		75,300,000	29,788,000
Long-term debt, less current maturities		326,133,000	250,682,000
Applicable rate from interest rate of loan varying with prime, federal funds and/or LIBOR				1.50%		1.80%				2.60%
Average interest rate of loan with prime, federal funds and/or LIBOR				1.70%		2.00%				3.00%
Interest rate on Senior Subordinated Notes															8.00%
Debt maturity date										October 15, 2013					2013
Aggregate principal amount of outstanding Senior Subordinated Notes	125,000,000													125,000,000
Write off of unamortized debt issue cost	$ 800,000

[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 December 31, 2011, this rate was 1.5% and averaged 1.7% for the twelve-month period ended December 31, 2011.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At December 31, 2011, this rate was 1.8% and averaged 2.0% for the twelve-month period ending December 31, 2011.

[3] The interest rate for this loan varies with LIBOR. At December 31, 2011, the rate was 2.6% and averaged 3.0% for the twelve-month period ending December 31, 2011.

[4] On May 2, 2011, the Company redeemed all $125.0 million in aggregate principal amount outstanding of its Senior Subordinated Notes at 8%, plus accrued and unpaid interest. As a result, the Company expensed $0.8 million of unamortized debt issue cost.

[5] This amount consists of two fixed-rate commercial loans with an outstanding balance of €5,019 at December 31, 2011. The loans are secured by the Company's facility in Bad Neustadt, Germany.