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Net Income Per Unit - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Asset Acquisition, Equity Interest Transfered As Consideration, Shares       5,000,000  
General Partnership          
General partner's ownership interest (as percent)   0.00% 2.00% 2.00% 2.00%
Big Spring Gathering Asset          
Asset Acquisition, Equity Interest Transfered As Consideration, Shares 5,000,000.0