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Condensed Consolidated Balance Sheets (Parenthetical) - shares
Mar. 31, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheets    
Class B preferred units, issued 31,000,887 29,296,441
Class B preferred units, outstanding 31,000,887 29,296,441
Units, issued 14,153,061 13,447,749
Units, outstanding 14,153,061 13,447,749