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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2019
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 $3.8 million and $7.3 million for the three months ended March 31, 2018 and 2019, respectively. We recorded receivables of $1.9 million and $2.6 million from this customer at December 31, 2018 and March 31, 2019, 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.