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Subsequent Events - Distribution Declaration (Details) - $ / shares
3 Months Ended 6 Months Ended
Aug. 13, 2019
May 14, 2019
Feb. 12, 2019
Nov. 09, 2018
Aug. 13, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Subsequent Event [Line Items]                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit   $ 0.820 $ 0.810 $ 0.790 $ 0.770        
Cash distributions per limited partner unit (in dollars per share)           $ 0.850 $ 0.770 $ 1.670 $ 1.520
Subsequent Event                  
Subsequent Event [Line Items]                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.850