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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Recognizable events No recognizable events occurred subsequent to June 30, 2018. Non-recognizable events Cash Distribution. In July 2018, our general partner’s board of directors declared a quarterly distribution of $0.9575 per unit for the period of April 1, 2018 through June 30, 2018. This quarterly cash distribution will be paid on August 14, 2018 to unitholders of record on August 7, 2018. The total cash distributions expected to be paid under this declaration are approximately $218.5 million.