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Related Party Transactions (Details) (NGL Energy [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
NGL Energy [Member]
       
Related Party Transaction        
Revenues $ 19,459 $ 13,438 $ 35,324 $ 27,550
Purchases 0 12,677 0 30,564
Reimbursements from NGL Energy for transition services $ 48 $ 131 $ 96 $ 498