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Derivatives (Tables)
3 Months Ended
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Commodity Swap
   Three Months Ended 
   March 31, 
   2013 2012 
        
Change in fair value of derivatives that do not qualify for hedge       
 accounting $ (631) $ 1,181 
Realized losses on derivatives    1,115   1,026 
        
Ineffective portion of derivatives qualifying for hedge accounting    (12)   (38) 
Net (gains) losses related to commodity swaps  $ 472 $ 2,169 
        
Loss on derivatives  $ 472 $ 2,169 
Fair Value of Derivative Assets and Liabilities relating to commodity swaps
The fair value of derivative assets and liabilities relating to commodity swaps are as follows (in thousands):   
        
   March 31, December 31,
   2013 2012
        
Fair value of derivative assets — current, designated  $ 551 $ 724
Fair value of derivative assets — current, non-designated    2,147   2,510
Fair value of derivative assets — long term, designated    9   -
Fair value of derivative liabilities — current, designated    (43)   (105)
Fair value of derivative liabilities — current, non-designated    (212)   (1,205)
Fair value of derivative liabilities — long term, designated    (12)   -
Net fair value of derivatives  $ 2,440 $ 1,924
Notional Amount and Fair Value of Derivative Instruments
   March 31, 2013
Transaction Type Volume Fair Value
       
   (In thousands)
       
Cash Flow Hedges:*     
 Liquids swaps (short contracts)   (7,076) $ 505
 Total swaps designated as cash flow hedges    $ 505
       
Mark to Market Derivatives:*     
 Swing swaps (short contracts)   (1,014)   -
 Physical offsets to swing swap transactions (long contracts)   1,014   -
       
 Basis swaps (long contracts)   450   -
 Physical offsets to basis swap transactions (short contracts)   (450)   1,585
 Basis swaps (short contracts)   (450)   8
 Physical offsets to basis swap transactions (long contracts)   450   (1,745)
       
       
 Processing margin hedges — liquids (short contracts)   (4,483)   1,059
 Processing margin hedges — gas (long contracts)   523   272
       
 Liquids swaps - non-designated (short contracts)   (3,407)   792
       
 Storage swap transactions — gas (short contracts)   (100)   (35)
 Storage swap transactions — liquids inventory (short contracts)   (840)   (1)
       
 Total mark to market derivatives    $ 1,935
Impact of Cash Flow Hedges
   Three Months Ended 
   March 31, 
Increase (Decrease) in Midstream Revenue 2013 2012 
Liquids realized gain (loss) included in Midstream revenue $ 280 $ (12) 
Realized gains included in income from discontinued       
        
Realized gain (loss) included in Midstream revenue $ 280 $ (12) 
Derivatives Other than Cash Flow Hedges
  Maturity Periods
  Less than one year One to two years More than two years Total fair value
March 31, 2013 $ 1,935 $ -  $ -  $ 1,935