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Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets $ 1,347 $ 223
Total liability (1,425) (3,730)
Commodity derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 1,347 223
Total liability (1,371) (3,730)
Interest rate derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability (54)  
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets      
Total liability      
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Commodity derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets      
Total liability      
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Interest rate derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability     
Significant Other Observable Inputs (Level 2) [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets      
Total liability      
Significant Other Observable Inputs (Level 2) [Member] | Commodity derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets      
Total liability      
Significant Other Observable Inputs (Level 2) [Member] | Interest rate derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability     
Significant Unobservable Inputs (Level 3) [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 1,347  
Total liability (1,425) (3,730)
Significant Unobservable Inputs (Level 3) [Member] | Commodity derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 1,347 223
Total liability (1,371) (3,730)
Significant Unobservable Inputs (Level 3) [Member] | Interest rate derivative contracts [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability $ (54)