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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets:    
Fair value of commodity derivatives $ 3,372 $ 2,518
Liabilities:    
Fair value of commodity derivatives 0 208
Recurring | Significant Other Observable Inputs (Level 2)
   
Assets:    
Fair value of commodity derivatives 3,372 2,518
Total assets 3,372 2,518
Liabilities:    
Fair value of commodity derivatives 0 208
Total liabilities $ 0 $ 208