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Partners' Capital - Additional Information (Details) - shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Class B Convertible Preferred Units    
Business Acquisition    
Number of Class B convertible preferred units converted to common units 0 1,240,404
CMTC    
Business Acquisition    
Common Units converted to General Partner Units 0 315,908
Interest of CGP in the partnership 2.00% 2.00%