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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability $ 1,380 $ 3,507
Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 244   
Total liability (1,380) (3,507)
Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 244   
Total liability (1,302) (3,507)
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability (78)  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability     
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability     
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 244   
Total liability (1,380) (3,507)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total assets 244   
Total liability (1,302) (3,507)
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Total liability $ (78)