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Derivative Instruments Income Statment Location (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (117) $ 1,808 $ 42 $ 1,429
Interest expense | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (1) 4 (24) (71)
Cost of goods sold | Commodity derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (116) $ 1,804 $ 66 $ 1,500