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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Barry R. Pearl is an independent member of our general partner’s board of directors and was also a director of Targa Resources Partners, L.P. (“Targa”) through February 29, 2016. In the normal course of business, we purchase butane from subsidiaries of Targa. During Mr. Pearl’s tenure as a director of the general partner of Targa, we made purchases of butane from subsidiaries of Targa of $25.5 million and $4.7 million for the years ended December 31, 2015 and 2016, respectively. Stacy P. Methvin was elected as an independent member of our general partner’s board of directors on April 23, 2015 and is also a director of one of our customers. Since April 23, 2015, we received tariff revenue of $9.3 million, $16.2 million and $16.6 million for the periods ending December 31, 2015, 2016 and 2017, respectively, from this customer. We recorded a receivable of $1.4 million and $1.6 million from this customer at December 31, 2016 and 2017, 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 a discussion of transactions with our joint venture affiliates.