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Partners' Capital (Schedule of Common Units) (Details) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Partners' Capital [Abstract]    
Number of common units at December 31, 2015 (in shares) 87,365,706 87,365,706
Common units issued in connection with acquisitions (in shares)   5,710,922
Common units issued in connection with the PIPE Transaction (in shares) 2,263,158 2,263,158
Number of common units at September 30, 2016 (in shares)   95,339,786