XML 122 R101.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies (Details 3) - SemGas [Member] - Fractionation capacity [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 10,552
Purchase Obligation, Due in Second Year 9,567
Purchase Obligation, Due in Third Year 8,864
Purchase Obligation, Due in Fourth Year 7,175
Purchase Obligation, Due in Fifth Year 6,753
Purchase Obligation, Due after Fifth Year 2,791
Purchase Obligation $ 45,702