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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Jan. 24, 2019 | Nov. 09, 2018 | Aug. 13, 2018 | May 15, 2018 | Feb. 12, 2018 | Nov. 14, 2017 | Aug. 11, 2017 | May 12, 2017 | Feb. 14, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit |  |  | $ 0.790 | $ 0.770 | $ 0.750 | $ 0.725 | $ 0.715 | $ 0.705 | $ 0.690 | $ 0.680 |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized |  |  | $ 3.16 | $ 3.08 | $ 3.00 | $ 2.90 | $ 2.86 | $ 2.82 | $ 2.76 | $ 2.72 |  |  |
Total Cash Distribution, including general partner interest and IDRs (in thousands) |  |  | $ 25,960 | $ 24,984 | $ 23,997 | $ 22,777 | $ 22,270 | $ 21,783 | $ 21,024 | $ 20,537 | $ 101,900 | $ 87,900 | $ 75,000
Less: General partner's IDRs |  |  |  |  |  |  |  |  |  |  | 24,224 | 17,389 | 11,160
Total cash distributions |  |  |  |  |  |  |  |  |  |  | $ 101,890 | $ 87,854 | $ 75,019
Cash distributions per limited partner unit (in usd per unit) |  |  |  |  |  |  |  |  |  |  | $ 3.120 | $ 2.835 | $ 2.575
General Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
General partner's distributions |  |  |  |  |  |  |  |  |  |  | $ 1,553 | $ 1,408 | $ 1,277
Less: General partner's IDRs |  |  |  |  |  |  |  |  |  |  | 24,224 | 17,389 | 11,160
Total general partner's distributions |  |  |  |  |  |  |  |  |  |  | 25,777 | 18,797 | 12,437
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  |  | 76,113 | 69,057 | 62,582
Limited Partner | Common Units |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  |  | 76,113 | 69,057 | 58,158
Limited Partner | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 4,424
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit | $ 0.810 |  |  |  |  |  |  |  |  |  |  |  |
Total Quarterly Distribution Per Limited Partner Unit, Annualized | $ 3.24 |  |  |  |  |  |  |  |  |  |  |  |
Total Cash Distribution, including general partner interest and IDRs (in thousands) | $ 26,949 | $ 26,900 |  |  |  |  |  |  |  |  |  |  |

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