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Commitments and Contingencies - Take or Pay (Details) - U.S. Gas [Member] - Fractionation capacity [Member]
$ in Thousands
Jun. 30, 2019
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Remainder of the year $ 4,932
Purchase Obligation, Due in Second Year 9,063
Purchase Obligation, Due in Third Year 7,337
Purchase Obligation, Due in Fourth Year 6,905
Purchase Obligation, Due in Fifth Year 2,854
Purchase Obligation, Due after Fifth Year 0
Purchase Obligation $ 31,091