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Condensed Consolidated Balance Sheets (Parenthetical) (Limited partner)
Sep. 30, 2014
Dec. 31, 2013
Common units
    
Limited partner units issued (in shares) 30,711,733 23,561,780
Limited partner units outstanding (in shares) 30,711,733 23,561,780
Subordinated units
    
Limited partner units issued (in shares) 14,048,588 14,048,588
Limited partner units outstanding (in shares) 14,048,588 14,048,588