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Commitments and Contingencies Commitments and Contingencies - Take or Pay (Details) - Fractionation capacity [Member]
$ in Thousands
Jun. 30, 2016
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Remainder of the year $ 5,951
Purchase Obligation, Due in Second Year 11,938
Purchase Obligation, Due in Third Year 10,060
Purchase Obligation, Due in Fourth Year 9,121
Purchase Obligation, Due in Fifth Year 8,451
Purchase Obligation, Due after Fifth Year 15,940
Purchase Obligation $ 61,461