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Financial Instruments and Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Pound
Sep. 30, 2011
Dec. 31, 2011
Pound
Sep. 30, 2012
Interest Rate Swap [Member]
Sep. 30, 2011
Interest Rate Swap [Member]
Sep. 30, 2012
Interest Rate Swap [Member]
Sep. 30, 2011
Interest Rate Swap [Member]
Sep. 30, 2012
Period From October2012 Through December2012 [Member]
Sep. 30, 2012
Period From January 2013 Through December 2013 [Member]
Sep. 30, 2012
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Oct. 04, 2010
Senior Notes [Member]
Secured Long-Term Debt, Noncurrent                           $ 175,000
Long-Term Debt, Fair Value                       191,625 179,156  
Notional Amount Of Foreign Currency Derivatives 17,532   17,532                      
Gain (Loss) On Derivative Instruments Held For Trading Purposes, Net 655 2,026 97 628                    
Notional Amount Of Cash Flow Hedge Instruments 50,250 [1]   50,250 [1]   55,000 [1]         13,750 36,500      
Fixed Price Commodity Contracts (in pounds)     1,625   6,500                  
Fixed Price Commodity Contracts1 (in pounds)     1,000                      
Notional Amount Of Interest Rate Fair Value Hedge Derivatives 45,000   45,000                      
Debt Instrument, Interest Rate, Stated Percentage                       9.50%   9.50%
Derivative, Variable Interest Rate 7.20%   7.20%                      
Derivative, Fixed Interest Rate 9.50%   9.50%                      
Increase Decrease In Derivative Interest Expenses           $ 241 $ 184 $ 634 $ 564          
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding.