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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Stacy P. Methvin is an independent member of our general partner’s board of directors and is also a director of one of our customers. We received tariff and other ancillary revenue from this customer of $4.1 million and $6.0 million for the three months ended September 30, 2017 and 2018, respectively, and $12.5 million and $14.4 million for the nine months ended September 30, 2017 and 2018, respectively. We recorded receivables of $1.6 million and $3.0 million from this customer at December 31, 2017 and September 30, 2018, respectively. The tariff revenue we recognized from this customer was in the normal course of business, with rates determined in accordance with published tariffs. See Note 4 – Investments in Non-Controlled Entities for details of transactions with our joint ventures.