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Equity Cash distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 27, 2015
Aug. 14, 2015
May. 14, 2015
Feb. 13, 2015
Nov. 14, 2014
Aug. 14, 2014
May. 14, 2014
Feb. 13, 2014
Sep. 30, 2015
Sep. 30, 2014
 [1]
Sep. 30, 2015
 [2]
Sep. 30, 2014
 [1]
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit, Paid   $ 0.550 $ 0.530 $ 0.510 $ 0.490 $ 0.475 $ 0.425 $ 0.415        
Total Quarterly Distribution per Limited Partner Unit, Annualized   $ 2.20 $ 2.12 $ 2.04 $ 1.96 $ 1.90 $ 1.70 $ 1.66        
Total Cash Distribution, including general partner IDRs (in thousands)   $ 14,368 $ 13,702 $ 13,056 $ 12,394 $ 11,910 $ 10,474 $ 10,228        
Total Quarterly Distribution Per Limited Partner Unit                 $ 0.570 $ 0.490 $ 1.650 $ 1.390
Subsequent Event [Member]                        
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit $ 0.570                      
Total Quarterly Distribution Per Limited Partner Unit, Annualized $ 2.28                      
Total Cash Distribution, including general partner IDRs (in thousands) $ 15,136                      
[1] Adjusted to include the historical results of the Logistics Assets Predecessor. See Notes 1 and 2 for further discussion.
[2] The information presented includes the results of operations of the Logistics Assets Predecessor. See Notes 1 and 2 for further discussion.