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Subsequent Events - Distribution Declaration (Details) - $ / shares
3 Months Ended 6 Months Ended
Aug. 12, 2020
May 12, 2020
Feb. 12, 2020
Nov. 12, 2019
Aug. 13, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsequent Event [Line Items]                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit   $ 0.890 $ 0.885 $ 0.880 $ 0.850        
Cash distributions per limited partner unit (in dollars per share)           $ 0.900 $ 0.850 $ 1.790 $ 1.670
Subsequent Event                  
Subsequent Event [Line Items]                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.900