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Derivative Instruments Income Statment Location (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (161) $ (229) $ 159 $ (379)
Interest expense | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (4) (54) (23) (75)
Cost of goods sold | Commodity derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (157) $ (175) $ 182 $ (304)