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Subsequent Events - Distribution Declaration (Details) - $ / shares
3 Months Ended 6 Months Ended
Aug. 13, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Line Items]          
Cash distributions per limited partner unit (in dollars per share)   $ 0.770 $ 0.705 $ 1.52 $ 1.3950
Subsequent Event          
Subsequent Event [Line Items]          
Cash distributions per limited partner unit (in dollars per share) $ 0.770