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Commitments and Contingencies Commitments and Contingencies (Details 4) - Pipeline transportation capacity [Member] - U.S. Liquids [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 21,865
Purchase Obligation, Due in Second Year 19,751
Purchase Obligation, Due in Third Year 12,976
Purchase Obligation, Due in Fourth Year 13,231
Purchase Obligation, Due in Fifth Year 13,496
Purchase Obligation, Due after Fifth Year 6,816
Purchase Obligation $ 88,135