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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
General partner's distributions | $ 356 | $ 325 | $ 1,048 | $ 940
General partner's IDRs | 4,496 | 3,057 | 12,649 | 7,503
Total general partner's distributions | 4,852 | 3,382 | 13,697 | 8,443
Total limited partners' distributions | 17,418 | 15,920 | 51,380 | 46,039
Total cash distributions | $ 22,270 | $ 19,302 | $ 65,077 | $ 54,482
Cash distributions per limited partner unit (in dollars per share) | $ 0.715 | $ 0.655 | $ 2.110 | $ 1.895
Limited Partner [Member] | Common Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 17,418 | $ 15,920 | $ 51,380 | $ 41,615
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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