Debt (Schedule of Debt and Capital Lease Obligations) (Details) In Thousands, unless otherwise specified	0 Months Ended			6 Months Ended				6 Months Ended				6 Months Ended
	May 02, 2011 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Credit Line, Due 2013 [Member] USD ($)		Dec. 31, 2010 Credit Line, Due 2013 [Member] USD ($)		Jun. 30, 2011 Term Loan, Denominated in U.S. Dollars, Due 2013 [Member] USD ($)		Dec. 31, 2010 Term Loan, Denominated in U.S. Dollars, Due 2013 [Member] USD ($)		Jun. 30, 2011 Term Loan, Denominated in Euros ("EUR"), Due 2013 [Member] USD ($)		Dec. 31, 2010 Term Loan, Denominated in Euros ("EUR"), Due 2013 [Member] USD ($)		Jun. 30, 2011 Senior Subordinated Notes at 8%, Due 2013 [Member]	Dec. 31, 2010 Senior Subordinated Notes at 8%, Due 2013 [Member] USD ($)		Jun. 30, 2011 Secured Mortgages [Member] USD ($)		Jun. 30, 2011 Secured Mortgages [Member] EUR (€)		Dec. 31, 2010 Secured Mortgages [Member] USD ($)		Jun. 30, 2011 Capitalized Leases and Other Long-Term Debt [Member] USD ($)	Dec. 31, 2010 Capitalized Leases and Other Long-Term Debt [Member] USD ($)
Short-term debt		$ 2,951	$ 7,440
Total long-term debt, including current maturities	125,000	183,367	280,470	35,000	[1]		[1]	68,077	[2]	75,000	[2]	64,233	[3]	65,250	[3]		125,000	[4]	7,610	[5]	5,248	[5]	7,322	[5]	8,447	7,898
Current maturities of long-term debt		35,059	29,788
Total long-term debt, less current maturities		148,308	250,682
Interest rate of loan varies with LIBOR and/or prime and/or federal funds				1.80%				2.20%				3.20%
Average interest rate of loan with LIBOR and/or prime and/or federal funds				2.10%				2.30%				3.00%
Interest rate on Senior Subordinated Notes	8.00%															8.00%
Debt maturity date				2013				2013				2013				2013
Write off of unamortized debt issue cost	$ 834

[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 LIBOR for the applicable currency. At June 30, 2011, the applicable rate was 1.8% and averaged 2.1% for the six-month period ended June 30, 2011.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At June 30, 2011, the applicable rate was 2.2% and averaged 2.3% for the six-month period ended June 30, 2011.

[3] The interest rate for this loan varies with LIBOR. At June 30, 2011, this rate was 3.2% and averaged 3.0% for the six-month period ended June 30, 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 wrote off $834 of unamortized debt issue cost.

[5] This amount consists of two fixed-rate commercial loans with an outstanding balance of €5,248 at June 30, 2011. The loans are secured by the Company's facility in Bad Neustadt, Germany.