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Net Income per Unit - Additional Information (Details) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Non-vested units awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive units 545,002 679,168
Class B Convertible Preferred Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive units 12,983,333 12,983,333
First Target Distribution    
First target distribution level per unit $ 0.2425 $ 0.2425