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Summary of Significant Accounting Policies - Issuance, dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Aug. 07, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Net Income Per Limited Partner Unit            
General partner ownership interest (as a percent)           0.67%
Common Limited Partners            
Net Income Per Limited Partner Unit            
Quarterly cash distributions declared (in dollars per unit)   $ 0.5000 $ 0.4750 $ 0.4750 $ 0.4625  
Series A Preferred Limited Partners            
Net Income Per Limited Partner Unit            
Public offering of common units 2,760,000          
Quarterly cash distributions declared (in dollars per unit)   $ 0.609375 $ 0.663500