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Equity - Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2020 | Jan. 24, 2020 | Nov. 12, 2019 | Aug. 13, 2019 | May 14, 2019 | Feb. 12, 2019 | Nov. 09, 2018 | Aug. 13, 2018 | May 15, 2018 | Feb. 12, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit |  |  | $ 0.880 | $ 0.850 | $ 0.820 | $ 0.810 | $ 0.790 | $ 0.770 | $ 0.750 | $ 0.725 |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized |  |  | $ 3.52 | $ 3.40 | $ 3.28 | $ 3.24 | $ 3.16 | $ 3.08 | $ 3.00 | $ 2.90 |  |  |
Total Cash Distribution, including general partner interest and IDRs (in thousands) |  |  | $ 30,379 | $ 28,914 | $ 27,438 | $ 26,949 | $ 25,960 | $ 24,984 | $ 23,997 | $ 22,777 | $ 113,700 | $ 97,700 | $ 85,600
Less: General partner's IDRs |  |  |  |  |  |  |  |  |  |  | 31,781 | 24,224 | 17,389
Total cash distributions |  |  |  |  |  |  |  |  |  |  | $ 117,365 | $ 101,890 | $ 87,854
Cash distributions per limited partner unit (in usd per unit) |  |  |  |  |  |  |  |  |  |  | $ 3.440 | $ 3.120 | $ 2.835
General Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
General partner's distributions |  |  |  |  |  |  |  |  |  |  | $ 1,711 | $ 1,553 | $ 1,408
Less: General partner's IDRs |  |  |  |  |  |  |  |  |  |  | 31,781 | 24,224 | 17,389
Total general partner's distributions |  |  |  |  |  |  |  |  |  |  | 33,492 | 25,777 | 18,797
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  |  | $ 83,873 | $ 76,113 | $ 69,057
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit | $ 0.885 |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized | $ 3.54 |  |  |  |  |  |  |  |  |  |  |  |
Total Cash Distribution, including general partner interest and IDRs (in thousands) | $ 30,634 | $ 30,600 |  |  |  |  |  |  |  |  |  |  |

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