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Subject to master netting agreements (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Derivative instruments [Line Items]      
Derivative asset, fair value, gross asset $ 330 $ 1,950 $ 6,179
Derivative liability fair value gross liability 12,186 7,483 12,445
Commodity derivatives [Member]
      
Derivative instruments [Line Items]      
Derivative asset, fair value, gross asset 330 1,950 6,179
Gross amount not offset (330) (1,950) (3,578)
Derivative asset, fair value, net 0 0 2,601
Total assets [Member]
      
Derivative instruments [Line Items]      
Derivative asset, fair value, gross asset 330 1,950 6,179
Gross amount not offset (330) (1,950) (3,578)
Derivative asset, fair value, net 0 0 2,601
Commodity derivatives - liabilities [Member]
      
Derivative instruments [Line Items]      
Derivative liability fair value gross liability 12,186 7,483 7,987
Gross amount not offset (330) (1,950) (3,578)
Derivative liability, fair value, net 11,856 5,533 4,409
Interest rate derivatives - liabilities [Member]
      
Derivative instruments [Line Items]      
Derivative liability fair value gross liability     4,458
Gross amount not offset     0
Derivative liability, fair value, net     4,458
Total liabilities [Member]
      
Derivative instruments [Line Items]      
Derivative liability fair value gross liability 12,186 7,483 12,445
Gross amount not offset (330) (1,950) (3,578)
Derivative liability, fair value, net $ 11,856 $ 5,533 $ 8,867