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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Interest rate swaps [Member]
DerivativeContract
Jun. 30, 2013
Commodity contracts [Member]
Jun. 30, 2012
Commodity forward contract one [Member]
Jun. 30, 2013
Commodity forward contract two [Member]
Dec. 31, 2012
Commodity forward contract two [Member]
Jun. 30, 2013
Commodity Forward Contract Three [Member]
Jun. 30, 2013
Commodity forward contract Four [Member]
Jun. 30, 2013
Commodity forward contract Five [Member]
Jun. 30, 2013
Commodity Forward Contract Six [Member]
Jul. 01, 2012
Interest rate swap one [Member]
Oct. 01, 2012
Interest rate swap two [Member]
Jun. 30, 2013
Foreign Exchange Contract [Member]
DerivativeContract
Dec. 31, 2012
Foreign Exchange Contract [Member]
DerivativeContract
Jun. 30, 2013
Derivatives not designated as hedging instruments [Member]
Dec. 31, 2012
Derivatives not designated as hedging instruments [Member]
Jun. 30, 2013
Derivatives not designated as hedging instruments [Member]
Interest rate swaps [Member]
Dec. 31, 2012
Derivatives not designated as hedging instruments [Member]
Interest rate swaps [Member]
Jun. 30, 2013
Derivatives not designated as hedging instruments [Member]
Commodity contracts [Member]
Dec. 31, 2012
Derivatives not designated as hedging instruments [Member]
Commodity contracts [Member]
Derivative [Line Items]                                                
Maturity period of contracts, maximum (in months)             12 months                                  
Number of outstanding contracts           2                     0 0            
Derivative, notional amount               $ 1,898 $ 3,472 $ 3,472 $ 2,677 $ 2,636 $ 4,033 $ 2,169 $ 200,000 $ 100,000                
Total gains or losses recognized (826) (166) (1,118) 254                                        
Derivative, fixed rate (in hundredths)                             1.905% 2.22%                
Net derivatives liability                                     (1,409) (2,862) (501) (2,973) (908) 111
Fair value of derivative contracts excluding impact of credit risk (1,422)   (1,422)   (2,936)                                      
Outstanding commodity forward contracts [Abstract]                                                
Trade Date               May 18, 2012 Oct. 29, 2012 Oct. 29, 2012 Feb. 26, 2013 Mar. 01, 2013 Apr. 15, 2013 Jun. 21, 2013                    
Effective Date               Jul. 01, 2012 Jan. 01, 2013 Jan. 01, 2013 Mar. 01, 2013 Mar. 01, 2013 May 01, 2013 Oct. 01, 2013                    
Notional Amount               $ 1,898 $ 3,472 $ 3,472 $ 2,677 $ 2,636 $ 4,033 $ 2,169 $ 200,000 $ 100,000                
Termination Date               Dec. 31, 2012 Sep. 30, 2013 Sep. 30, 2013 Dec. 31, 2013 Dec. 31, 2013 Dec. 31, 2013 Jun. 30, 2014