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Related Party Transactions (Details) (NGL Energy [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
NGL Energy [Member]
   
Related Party Transaction    
Revenues $ 15,865 $ 14,112
Purchases 0 17,887
Reimbursements from NGL Energy for transition services $ 90 $ 367