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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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] $ 434 [1] $ 0 [2] $ 365
Amount of loss reclassified from Accumulated Other Comprehensive Loss into net income 0 [1] 0 [1] 0 0
Amount of gain (loss) recognized in net income on hedges (ineffective portion) 0 [1] 0 [1] 0 0
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]
Amount of loss reclassified from Accumulated Other Comprehensive Loss into net income (1,003) [2] (270) [2] (2,005) [2] (270) [2]
Amount of gain (loss) recognized in net income on hedges (ineffective portion) 1,266 [2] 27 [2] 2,472 [2] 27 [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) $ (826) $ (166) $ (1,118) $ 254
[1] Periods prior to May 30, 2012
[2] Period subsequent to June 30, 2013