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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2016 | Nov. 13, 2015 | Aug. 14, 2015 | May. 14, 2015 | Feb. 13, 2015 | Nov. 14, 2014 | Aug. 14, 2014 | May. 14, 2014 | Feb. 13, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly cash distribution (dollars per unit) |  | $ 0.570 | $ 0.550 | $ 0.530 | $ 0.510 | $ 0.490 | $ 0.475 | $ 0.425 | $ 0.415 |  |  |
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit |  | $ 2.28 | $ 2.20 | $ 2.12 | $ 2.04 | $ 1.96 | $ 1.90 | $ 1.70 | $ 1.66 |  |  |
Cash Distributions Paid |  | $ 15,136 | $ 14,368 | $ 13,702 | $ 13,056 | $ 12,394 | $ 11,910 | $ 10,474 | $ 10,228 |  |  |
General partner's distributions |  |  |  |  |  |  |  |  |  | $ 1,109 | $ 938 | $ 785
General partner's IDRs |  |  |  |  |  |  |  |  |  | 3,904 | 945 | 0
Total general partner's distributions |  |  |  |  |  |  |  |  |  | 5,013 | 1,883 | 785
Limited partners' distribution |  |  |  |  |  |  |  |  |  | 54,317 | 45,951 | 38,491
Total cash distributions |  |  |  |  |  |  |  |  |  | $ 59,330 | $ 47,834 | $ 39,276
Cash distributions per limited partner unit |  |  |  |  |  |  |  |  |  | $ 2.240 | $ 1.900 | $ 1.600
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash Distributions Declared | $ 16,124 |  |  |  |  |  |  |  |  |  |  |
Cash distributions per limited partner unit | $ 0.590 |  |  |  |  |  |  |  |  |  |  |
Distribution Made To Limited Partner Distributions Declared Annualized Per Unit | $ 2.36 |  |  |  |  |  |  |  |  |  |  |
Limited Partner [Member] | Common |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | $ 27,439 | $ 23,152 | $ 19,292
Limited Partner [Member] | Subordinated |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  |  |  |  |  | $ 26,878 | $ 22,799 | $ 19,199

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