CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jun. 30, 2017	Dec. 31, 2016
General partners' units outstanding (in shares)	461,136	461,136
Common Units
Limited partners' units outstanding (in shares)	19,537,699	14,185,599
Class A Units
Limited partners' units outstanding (in shares)	92,500	138,750
Subordinated Units
Limited partners' units outstanding (in shares)	6,278,127	8,370,836