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Equity Cash distributions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Aug. 14, 2014
May 14, 2014
Feb. 13, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Oct. 24, 2014
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]                
Total Quarterly Distribution Per Limited Partner Unit, Paid $ 0.475 $ 0.425 $ 0.415          
Total Quarterly Distribution per Limited Partner Unit, Annualized $ 1.90 $ 1.70 $ 1.66          
Total Cash Distribution, including general partner IDRs $ 11,910 $ 10,474 $ 10,228          
Total Quarterly Distribution Per Limited Partner Unit               $ 0.490
Total Quarterly Distribution Per Limited Partner Unit, Annualized               $ 1.96
Total Cash Distribution, including general partner IDRs (in thousands)       $ 12,394 $ 9,933 $ 34,778 $ 29,048 $ 12,400