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Investments - Equity Method and Joint Ventures Investments - Equity Method and Joint Ventures (Details)
Sep. 30, 2016
Rendezvous Gas Services, L.L.C.  
Equity Method Investment, Ownership Percentage 78.00%
Three Rivers Gathering, L.L.C.  
Equity Method Investment, Ownership Percentage 50.00%
Uintah Basin Field Services, L.L.C.  
Equity Method Investment, Ownership Percentage 38.00%