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Commitments and Contingencies - Take or Pay (Details) - U.S. Gas [Member] - Fractionation capacity [Member]
$ in Thousands
Sep. 30, 2019
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Remainder of the year $ 2,517
Purchase Obligation, Due in Second Year 9,277
Purchase Obligation, Due in Third Year 7,489
Purchase Obligation, Due in Fourth Year 7,048
Purchase Obligation, Due in Fifth Year 2,913
Purchase Obligation $ 29,244