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Derivative Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Notional Amount of Interest Rate Derivatives $ 45,000,000   $ 45,000,000  
Derivative Liability, Fair Value, Gross Asset 279,000   279,000  
Derivative Liability, Fair Value, Gross Liability 0   0  
Derivative Instruments, Gain (Loss) Recognized in Income, Net (399,000) 71,000 (544,000) 304,000
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Liability, Fair Value, Gross Asset 159,000   159,000  
Derivative Liability, Fair Value, Gross Liability 0   0  
Other Current Assets [Member] | Not Designated as Hedging Instrument [Member] | Commodity derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Liability, Fair Value, Gross Asset 120,000   120,000  
Derivative Liability, Fair Value, Gross Liability 0   0  
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (88,000) 0 (63,000) 0
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Commodity derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (311,000) $ 71,000 $ (481,000) $ 304,000