Prospectus excerpt:  The preferred units represent a separate class of our limited partnership interests. As of May 2, 2018, there were 71,257,445 preferred units outstanding. On September 30, 2015, in connection with the Merger, the selling unitholders listed in this prospectus received 59,345,672 preferred units. An additional 11,911,773 preferred units were subsequently issued as PIK Distributions (as defined below). On November 23, 2015, we effected a reverse unit split at the ratio of 1-for-10, which proportionally adjusted the conversion ratio of the preferred units, so that the 71,257,445 preferred units currently outstanding are convertible into 7,125,745 common units, with fractional units rounded to the nearest whole unit; provided, however, that in certain circumstances, the preferred units may be converted using the Special Conversion Amount (as defined in the Partnership Agreement Amendment) or the Adjusted Conversion Amount (as defined in the Partnership Agreement Amendment), in each case as described below under “Conversion”.