Common Units - Public | Common Units - SemGroup | Subordinated Units | Class A units | ||||||||
December 14, 2011 initial public offering | 7,000,000 | 1,389,709 | 8,389,709 | — | |||||||
Balance at December 31, 2012 | 7,000,000 | 1,389,709 | 8,389,709 | — | |||||||
Private placement | 2,000,000 | — | — | — | |||||||
Units issued to SemGroup in SemCrude Pipeline transactions | — | 3,000,000 | — | 2,500,000 | |||||||
August common unit offering | 4,750,000 | — | — | — | |||||||
Vesting of share-based compensation awards, including equivalent distributions | 9,739 | — | — | — | |||||||
Balance at December 31, 2013 | 13,759,739 | 4,389,709 | 8,389,709 | 2,500,000 | |||||||