Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2015
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 is also a director of the general partner of Targa Resources Partners, L.P. ("Targa"). In the normal course of business, we purchase butane from subsidiaries of Targa. For the three months ended September 30, 2014 and 2015, we made purchases of butane from subsidiaries of Targa of $0.1 million and $1.5 million, respectively. For the nine months ended September 30, 2014 and 2015, we made purchases of butane from subsidiaries of Targa of $13.9 million and $14.3 million, respectively. These purchases were based on the then-current index prices. We had recognized payables to Targa of $0.9 million and $1.0 million at December 31, 2014 and September 30, 2015, 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. We received tariff revenue of $4.1 million and $6.7 million for the three months ended September 30, 2015 and for the period of April 23, 2015 through September 30, 2015, respectively, and have recorded a $1.3 million receivable from this customer at September 30, 2015. 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 affiliate joint venture transactions we account for under the equity method.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.