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Subsequent Events (Details) - $ / shares
 1 Months Ended 3 Months Ended 7 Months Ended
Jan. 23, 2015
Jan. 22, 2014
Apr. 23, 2015
Apr. 22, 2014
Aug. 14, 2015
Aug. 10, 2015
Jul. 23, 2015
Common Unitholders              
Dividend declared $ 0.2325 $ 0.2325 $ 0.2345 $ 0.2325     $ 0.2365
Dividend paid         $ 0.2365    
Preferred unit-holders              
Dividend declared $ 0.21375 $ 0.21375 $ 0.21575 $ 0.21375     $ 0.21775
Dividend paid           $ 0.21775