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Related Party Transactions 1 (Details) (Successor [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Successor [Member]
   
Related Party Transaction [Line Items]    
Operating revenues - ETE $ 10,180 $ 19,076
Cost of natural gas and other energy 4,688 13,170
Operating, maintenance and general 20,235 23,537
Interest expense 3,487 3,351
Losses from unconsolidated investments $ (1,065) $ (381)