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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended
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May 14, 2019 | Feb. 12, 2019 | Nov. 09, 2018 | Oct. 23, 2018 | Aug. 13, 2018 | May 15, 2018 | Feb. 12, 2018 | Feb. 28, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share) |  | $ 0.810 |  | $ 0.790 | $ 0.770 | $ 0.750 |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) |  | $ 3.24 |  | $ 3.16 | $ 3.08 | $ 3.00 |  |  |  |
Total Cash Distribution, including general partner interest and IDRs |  | $ 26,949 | $ 25,960 |  | $ 24,984 | $ 23,997 | $ 22,800 | $ 26,900 |  |
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.820 | $ 0.750
Subsequent Event |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share) | $ 0.820 |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) | $ 3.28 |  |  |  |  |  |  |  |  |
Total Cash Distribution, including general partner interest and IDRs | $ 27,438 |  |  |  |  |  |  |  |  |

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