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Commitments and Contingencies (Details 3) - U.S. Gas [Member] - Fractionation capacity [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 9,783
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 $ 35,942