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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

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