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Subsequent Events - Distribution Declaration (Details) - $ / shares
3 Months Ended 9 Months Ended
Oct. 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]          
Cash distributions per limited partner unit (in dollars per share)   $ 0.790 $ 0.715 $ 2.310 $ 2.110
Subsequent Event          
Subsequent Event [Line Items]          
Cash distributions per limited partner unit (in dollars per share) $ 0.790