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Commitments and Contingencies Commitments and Contingencies (Details 4) - Pipeline transportation capacity [Member] - Crude Supply and Logistics [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 21,631
Purchase Obligation, Due in Second Year 21,877
Purchase Obligation, Due in Third Year 20,585
Purchase Obligation, Due in Fourth Year 12,976
Purchase Obligation, Due in Fifth Year 13,231
Purchase Obligation, Due after Fifth Year 20,312
Purchase Obligation $ 110,612