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Derivative Instruments and Hedging Activities, Impact on condensed Consolidated Statements of Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest expense [Member] | Interest rate swaps [Member] | Derivatives designated as hedging instruments [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in Accumulated Other Comprehensive Loss     $ 0 [1] $ 365 [1]
Amount of loss reclassified from Accumulated Other Comprehensive Loss into net income     0 [1] 0 [1]
Amount of gain (loss) recognized in net income on hedges (ineffective portion)     0 [1] 0 [1]
Interest expense [Member] | Interest rate swaps [Member] | Derivatives not designated as hedging instruments [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in Accumulated Other Comprehensive Loss 0 [2] 0 [2] 0 [2] 0 [2]
Amount of loss reclassified from Accumulated Other Comprehensive Loss into net income (376) [2] (809) [2] (2,381) [2] (1,079) [2]
Amount of gain (loss) recognized in net income on hedges (ineffective portion) 501 [2] 462 [2] 2,973 [2] 489 [2]
Cost of goods Sold [Member] | Commodity contracts [Member] | Derivatives not designated as hedging instruments [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in Accumulated Other Comprehensive Loss 0 0 0 0
Amount of loss reclassified from Accumulated Other Comprehensive Loss into net income 0 0 0 0
Amount of gain (loss) recognized in net income on hedges (ineffective portion) $ 578 $ 68 $ (540) $ 322
[1] Periods prior to May 30, 2012, the date the hedging relationships were terminated
[2] Periods after May 30, 2012, the date the hedging relationships were terminated