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Subsequent Events - Distribution Declaration (Details) - $ / shares
3 Months Ended
May 15, 2018
Mar. 31, 2018
Mar. 31, 2017
Subsequent Event [Line Items]      
Cash distributions per limited partner unit (in dollars per share)   $ 0.75 $ 0.69
Subsequent Event      
Subsequent Event [Line Items]      
Cash distributions per limited partner unit (in dollars per share) $ 0.75