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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Distributions Earned by Limited or General Partners [Line Items] |  |
General partner's IDRs | $ 5,337 | $ 3,895
Total general partner's distributions | 5,710 | 4,237
Common limited partners' distributions | 18,287 | 16,787
Total cash distributions | $ 23,997 | $ 21,024
Cash distributions per limited partner unit (in dollars per share) | $ 0.75 | $ 0.69
General Partner |  |
Distributions Earned by Limited or General Partners [Line Items] |  |
General partner's distributions | $ 373 | $ 342
General partner's IDRs | $ 5,337 | $ 3,895

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