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Consolidated statements of partners' equity (Parenthetical) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Consolidated statements of partners' equity    
Purchase of common units by our long-term incentive plan and from affiliate (in units)   2,668
Issuance of common units due to vesting of restricted phantom units (in units) 15,750  
General partner interest (as a percent) 2.00% 2.00%
Payment for acquisition of hydrant system from TransMontaigne LLC $ 12.0