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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 24, 2017 | Nov. 14, 2016 | Aug. 12, 2016 | May 13, 2016 | Feb. 12, 2016 | Nov. 13, 2015 | Aug. 14, 2015 | May 14, 2015 | Feb. 13, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly cash distribution (dollars per unit) |  | $ 0.655 | $ 0.630 | $ 0.610 | $ 0.590 | $ 0.570 | $ 0.550 | $ 0.530 | $ 0.510 |  |  |
Cash distributions per limited partner unit |  |  |  |  |  |  |  |  |  | $ 2.575 | $ 2.240 | $ 1.900
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit |  | $ 2.62 | $ 2.52 | $ 2.44 | $ 2.36 | $ 2.28 | $ 2.20 | $ 2.12 | $ 2.04 |  |  |
Cash Distributions Paid |  | $ 19,302 | $ 18,085 | $ 17,095 | $ 16,124 | $ 15,136 | $ 14,368 | $ 13,702 | $ 13,056 |  |  |
General partner's distributions |  |  |  |  |  |  |  |  |  | $ 1,277 | $ 1,109 | $ 938
General partner's IDRs |  |  |  |  |  |  |  |  |  | 11,160 | 3,904 | 945
Total general partner's distributions |  |  |  |  |  |  |  |  |  | 12,437 | 5,013 | 1,883
Limited partners' distribution |  |  |  |  |  |  |  |  |  | 62,582 | 54,317 | 45,951
Total cash distributions |  |  |  |  |  |  |  |  |  | 75,019 | 59,330 | 47,834
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash distributions per limited partner unit | $ 0.680 |  |  |  |  |  |  |  |  |  |  |
Distribution Made To Limited Partner Distributions Declared Annualized Per Unit | $ 2.72 |  |  |  |  |  |  |  |  |  |  |
Cash Distributions Declared | $ 20,537 |  |  |  |  |  |  |  |  |  |  |
Limited Partner [Member] | Common |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | 58,158 | 27,439 | 23,152
Limited Partner [Member] | Subordinated |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | $ 4,424 | $ 26,878 | $ 22,799

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