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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Total revenue | $ 481,208 | $ 429,878 | $ 419,972 | $ 449,800 | $ 480,205 | $ 435,412 | $ 416,629 | $ 447,576 | $ 1,780,858 | $ 1,779,822 | $ 1,088,377
Total cost of revenue | 219,208 | 192,620 | 191,544 | 210,719 | 231,069 | 204,366 | 192,205 | 204,676 | 814,091 | 832,316 | 483,574
Net revenue | 262,000 | 237,258 | 228,428 | 239,081 | 249,136 | 231,046 | 224,424 | 242,900 | 966,767 | 947,506 | 604,803
Total expenses and other income | 198,824 | 193,175 | 186,157 | 183,302 | 192,101 | 189,479 | 202,956 | 190,658 | 761,458 | 775,194 | 511,356
Net income | $ 48,075 | $ 33,325 | $ 30,171 | $ 41,635 | $ 67,734 | $ 28,274 | $ 15,239 | $ 32,645 | $ 153,206 | $ 143,892 | $ 60,127
Diluted income per share: |  |  |  |  |  |  |  |  |  |  |
Net income per diluted share (in dollars per share) | $ 1.09 | $ 0.76 | $ 0.67 | $ 0.90 | $ 1.43 | $ 0.59 | $ 0.32 | $ 0.67 | $ 3.41 | $ 3.00 | $ 1.72
Diluted weighted-average shares | 43,936 | 44,116 | 45,043 | 46,479 | 47,212 | 47,668 | 48,289 | 48,402 | 44,884 | 47,888 | 35,004

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