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Equity Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
General partner's distributions | $ 350 | $ 313 | $ 692 | $ 615
General partner's IDRs | 4,258 | 2,462 | 8,153 | 4,446
Total general partner's distributions | 4,608 | 2,775 | 8,845 | 5,061
Total limited partners' distributions | 17,175 | 15,310 | 33,962 | 30,119
Total cash distributions | $ 21,783 | $ 18,085 | $ 42,807 | $ 35,180
Cash distributions per limited partner unit | $ 0.705 | $ 0.630 | $ 1.395 | $ 1.240
Limited Partner [Member] | Common Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 17,175 | $ 15,310 | $ 33,962 | $ 25,695
Limited Partner [Member] | Subordinated Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 0 | $ 0 | $ 0 | $ 4,424

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