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Net Income Per Unit - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
General partner's ownership interest (as percent) 2.00% 2.00% 2.00% 2.00%