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Subsequent Events Distribution Declaration (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 25, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Subsequent Event [Line Items]          
Cash distributions per limited partner unit   $ 0.630 $ 0.550 $ 1.240 $ 1.080
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Cash distributions per limited partner unit $ 0.630