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Equity Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
General partner's distributions | $ 325 | $ 282 | $ 940 | $ 816
General partner's IDRs | 3,057 | 1,032 | 7,503 | 2,396
Total general partner's distributions | 3,382 | 1,314 | 8,443 | 3,212
Total limited partners' distributions | 15,920 | 13,822 | 46,039 | 39,994
Total cash distributions | $ 19,302 | $ 15,136 | $ 54,482 | $ 43,206
Cash distributions per limited partner unit | $ 0.655 | $ 0.570 | $ 1.895 | $ 1.650
Limited Partner [Member] | Common Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 15,920 | $ 6,983 | $ 41,615 | $ 20,196
Limited Partner [Member] | Subordinated Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 0 | $ 6,839 | $ 4,424 | $ 19,798

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