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Derivative Instruments (Details Textual) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2014
Gas hedges
Sep. 30, 2013
Gas hedges
Sep. 30, 2014
Gas hedges
Sep. 30, 2013
Gas hedges
Sep. 30, 2014
Natural Gas Liquids
Sep. 30, 2013
Natural Gas Liquids
Sep. 30, 2014
Natural Gas Liquids
Sep. 30, 2013
Natural Gas Liquids
Sep. 30, 2014
Crude Oil
Sep. 30, 2013
Crude Oil
Sep. 30, 2014
Crude Oil
Sep. 30, 2013
Crude Oil
Derivatives, Fair Value [Line Items]                                    
Gain or loss recognized in oil and gas contracts             $ 337,000 $ 767,000 $ (4,802,000) $ 422,000 $ 28,000 $ 5,000 $ 28,000 $ 5,000 $ (125,000) $ (538,000) $ (1,231,000) $ (684,000)
Accumulated other comprehensive income (loss) 879,000 (3,654,000) (1,096,000) 1,340,000 1,418,000 521,000                        
Realization of gain, net of taxes $ 800,000