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Equity Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
General partner's distributions | $ 313 | $ 272 | $ 615 | $ 534
General partner's IDRs | 2,462 | 758 | 4,446 | 1,364
Total general partner's distributions | 2,775 | 1,030 | 5,061 | 1,898
Total limited partners' distributions | 15,310 | 13,338 | 30,119 | 26,172
Total cash distributions | $ 18,085 | $ 14,368 | $ 35,180 | $ 28,070
Cash distributions per limited partner unit | $ 0.630 | $ 0.550 | $ 1.240 | $ 1.080
Limited Partner [Member] | Common Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 15,310 | $ 6,738 | $ 25,695 | $ 13,213
Limited Partner [Member] | Subordinated Units [Member] |  |  |  |
Distributions Earned by Limited or General Partners [Line Items] |  |  |  |
Total limited partners' distributions | $ 0 | $ 6,600 | $ 4,424 | $ 12,959

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