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Subsequent Events (Details) - $ / shares
Feb. 12, 2019
Nov. 09, 2018
Aug. 13, 2018
May 15, 2018
Feb. 12, 2018
Nov. 14, 2017
Aug. 11, 2017
May 12, 2017
Feb. 14, 2017
Subsequent Event [Line Items]                  
Cash distributions per limited partner unit (in usd per unit)   $ 0.790 $ 0.770 $ 0.750 $ 0.725 $ 0.715 $ 0.705 $ 0.690 $ 0.680
Subsequent Event                  
Subsequent Event [Line Items]                  
Cash distributions per limited partner unit (in usd per unit) $ 0.810