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Commitments and Contingencies - Take or Pay (Details) - SemGas [Member] - Fractionation capacity [Member]
$ in Thousands
Sep. 30, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Remainder of the year $ 2,720
Purchase Obligation, Due in Second Year 9,783
Purchase Obligation, Due in Third Year 9,063
Purchase Obligation, Due in Fourth Year 7,337
Purchase Obligation, Due in Fifth Year 6,905
Purchase Obligation, Due after Fifth Year 2,854
Purchase Obligation $ 38,662