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Related Party Transactions - Transactions with NGL Energy (Details) (NGL Energy [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
NGL Energy [Member]
       
Related Party Transaction        
Revenues $ 108,456 $ 183,617 $ 280,894 $ 362,331
Related Party Transaction, Purchases from Related Party 113,154 145,469 270,845 285,392
Reimbursements from NGL Energy for transition services $ 42 $ 48 $ 84 $ 96