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v3.10.0.1

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net revenues | $ 159,298 | $ 164,110 | $ 166,280 | $ 167,921 | $ 151,207 | $ 130,626 | $ 126,769 | $ 129,473 | $ 657,609 | $ 538,075 | $ 448,059
Operating income | 31,147 | 32,624 | 34,710 | 27,277 | 23,698 | 22,636 | 23,371 | 18,472 | 125,757 | 88,177 | 77,650
Net income | 21,280 | 23,326 | 25,582 | 19,995 | 18,914 | 16,923 | 18,977 | 14,595 | 90,182 | 69,409 | 62,804
Limited partners' interest in net income | $ 14,215 | $ 16,690 | $ 19,370 | $ 14,365 | $ 13,891 | $ 12,178 | $ 14,425 | $ 10,486 | $ 64,639 | $ 50,980 | $ 50,611
Common Units |  |  |  |  |  |  |  |  |  |  |
Net income per limited partner unit: |  |  |  |  |  |  |  |  |  |  |
Common (basic) (in usd per unit) | $ 0.58 | $ 0.68 | $ 0.79 | $ 0.59 | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | $ 2.65 | $ 2.09 | $ 2.08
Common units - (diluted) (in usd per unit) | $ 0.58 | $ 0.68 | $ 0.79 | $ 0.59 | $ 0.57 | $ 0.50 | $ 0.59 | $ 0.43 | $ 2.65 | $ 2.09 | $ 2.07

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