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Financial Instruments and Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Interest Rate Swap [Member]
Mar. 31, 2012
Interest Rate Swap [Member]
Mar. 31, 2013
Forward Contracts [Member]
Mar. 31, 2012
Forward Contracts [Member]
Dec. 31, 2012
Forward Contracts [Member]
Mar. 31, 2013
Period From April 2013 Through December 2013 [Member]
Mar. 31, 2013
Commodity Contract [Member]
Pound
Dec. 31, 2012
Commodity Contract [Member]
Pound
Mar. 31, 2013
Senior Notes [Member]
Dec. 31, 2012
Senior Notes [Member]
Secured Long-Term Debt, Noncurrent                   $ 175,000 $ 175,000
Long-Term Debt, Fair Value                   188,563 188,895
Notional Amount Of Other Derivatives Not Designated As Hedging Instruments       12,585 [1]   12,643 [1]          
Gain (Loss) On Derivative Instruments Held For Trading Purposes, Net       363 877            
Notional Amount Of Cash Flow Hedge Instruments       27,375 [1]   36,500 [1] 27,375        
Fixed Price Commodity Contracts (in pounds)               2,339,000 [1] 2,436,000 [1]    
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   231 225                
Debt Instrument, Interest Rate, Stated Percentage   9.50%                  
Cash Flow Hedge Gain Reclassified To Earnings $ 2,399                    
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commodity notional amounts are in pounds.