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Financial Instruments and Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
pounds
Dec. 31, 2011
pounds
Dec. 31, 2010
Dec. 31, 2012
Interest Rate Swap [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Dec. 31, 2010
Interest Rate Swap [Member]
Dec. 31, 2012
Forward Contracts [Member]
Dec. 31, 2011
Forward Contracts [Member]
Dec. 31, 2012
Period From January 2013 To December 2013 [Member]
Dec. 31, 2012
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Oct. 04, 2010
Senior Notes [Member]
Secured Long-term Debt, Noncurrent                   $ 175,000 $ 175,000 $ 175,000
Long-term Debt, Fair Value                   188,895 179,156  
Notional amount of derivatives not designated as hedging instruments             12,643 [1] 25,894 [1]        
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net             492 225        
Notional Amount of Cash Flow Hedge Instruments             36,500 [1] 55,000 [1] 36,500      
Fixed Price Commodity Contracts (in pounds) 2,436 6,500                    
Notional Amount of Interest Rate Fair Value Hedge Derivatives       45,000                
Derivative, Variable Interest Rate       7.19%                
Derivative, Fixed Interest Rate       9.50%                
Increase Decrease In Derivative Interest Expenses       736 473 200            
Fair Value Adjustment Of Goodwill   4,945                    
Debt Instrument, Interest Rate, Stated Percentage       9.50%               9.50%
Cash Flow Hedge Gain Reclassified to Earnings 2,140                      
Foreign Currency Transaction Loss, before Tax     $ 240                  
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding.