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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Nov. 14, 2017 | Oct. 25, 2017 | Aug. 11, 2017 | May 12, 2017 | Feb. 14, 2017 | Nov. 14, 2016 | Aug. 12, 2016 | May 31, 2016 | Feb. 29, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share) |  |  | $ 0.705 | $ 0.690 | $ 0.680 | $ 0.655 |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) |  |  | $ 2.82 | $ 2.76 | $ 2.72 | $ 2.62 |  |  |  |  |  |  |
Total Cash Distribution, including general partner interest and IDRs |  |  | $ 21,783 | $ 21,024 | $ 20,537 | $ 19,302 | $ 18,100 | $ 17,100 | $ 16,100 |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.715 | $ 0.655 | $ 2.110 | $ 1.895
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) | $ 2.86 |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share) |  | $ 0.715 |  |  |  |  |  |  |  |  |  |  |
Total Cash Distribution, including general partner interest and IDRs - Declared |  | $ 22,270 |  |  |  |  |  |  |  |  |  |  |

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