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Partners' Capital - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 30, 2020
Aug. 05, 2020
Jun. 23, 2020
Apr. 29, 2020
Jan. 29, 2020
Oct. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 18, 2020
Partners' Capital                      
Partners' Capital Account, Units, Sold in Private Placement     6,153,846                
Shares Issued, Price Per Share in Private Placement                     $ 32.50
Proceeds from Issuance of Private Placement     $ 200,000                
Net Proceeds From Issuance Of Private Placement     $ 190,800                
Equity issuance costs                     $ 9,200
Distribution to General Partner                 100.00%    
Distribution Per Unit (in dollars per unit)   $ 0.7650   $ 0.6800 $ 0.6750 $ 0.6700 $ 0.7750 $ 0.6700 $ 2.2200 $ 1.9750  
Total Cash Distribution   $ 30,400   $ 22,900 $ 22,700 $ 22,400          
Total Payment to General Partner for Incentive Distribution Rights   $ 7,500   $ 3,500 $ 3,300 $ 3,100          
Minimum | General Partner Interest                      
Partners' Capital                      
Quarterly distribution of operating surplus (as a percent)                 15.00%    
Maximum | General Partner Interest                      
Partners' Capital                      
Quarterly distribution of operating surplus (as a percent)                 50.00%    
Subsequent Event                      
Partners' Capital                      
Distribution Per Unit (in dollars per unit) $ 0.7750                    
Total Cash Distribution $ 30,800                    
Total Payment to General Partner for Incentive Distribution Rights $ 7,900