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Derivative Instruments Income Statement Location (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 417 $ 2,991 $ (720)
Interest Rate Contract [Member] | Interest expense | Derivatives not designated as hedging instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (24) (92) (106)
OTC commodity swaps | Cost of goods sold | Derivatives not designated as hedging instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 441 $ 3,083 $ (614)