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Subsequent Events Distribution Declaration (Details) - $ / shares
3 Months Ended
Apr. 22, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]      
Cash distributions per limited partner unit   $ 0.610 $ 0.530
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Cash distributions per limited partner unit $ 0.610