XML 26 R31.htm IDEA: XBRL DOCUMENT v2.4.0.8
Financial Instruments and Fair Value Measurements (Schedule of Notional Amounts and Fair Value of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
lb
Dec. 31, 2012
lb
Forward Contracts [Member]
    
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Derivatives Designated As Hedging Instruments Cash Flow Hedges Notional Amount $ 57,125 [1] $ 36,500 [1]
Derivatives not designated as hedging instruments:    
Notional amount of derivatives not designated as hedging instruments 13,293 [1] 12,643 [1]
Commodity Contract [Member]
    
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Fixed price commodity contracts (in pounds) 1,937,000 [1] 2,436,000 [1]
Interest Rate Swap [Member]
    
Derivatives designated as hedging instruments, Fair Value Hedge:    
Derivatives Designated As Hedging Instruments Fair Value Hedges Notional Amount 45,000 [1] 45,000 [1]
Other Assets [Member] | Forward Contracts [Member]
    
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Cash Flow Hedges Derivative Instruments at Fair Value, Net   1,800
Other Assets [Member] | Commodity Contract [Member]
    
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Cash Flow Hedges Derivative Instruments at Fair Value, Net   340
Other Assets [Member] | Interest Rate Swap [Member]
    
Derivatives designated as hedging instruments, Fair Value Hedge:    
Interest Rate Fair Value Hedge Derivative at Fair Value, Net 1,193 2,212
Other Liabilities [Member] | Forward Contracts [Member]
    
Derivatives not designated as hedging instruments:    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net 14 191
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Cash Flow Hedges Derivative Instruments at Fair Value, Net 122  
Other Liabilities [Member] | Commodity Contract [Member]
    
Derivatives designated as hedging instruments, Cash Flow Hedges:    
Cash Flow Hedges Derivative Instruments at Fair Value, Net $ 107  
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commodity contract notional amounts are in pounds.