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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 191,424 | $ 169,532 | $ 167,623 | $ 176,023 | $ 202,774 | $ 175,000 | $ 165,326 | $ 169,777 | $ 704,602 | $ 712,877 | $ 660,848
Cost of revenue | 88,499 | 74,090 | 73,577 | 77,252 | 91,141 | 76,137 | 71,405 | 73,321 | 313,418 | 312,004 | 291,274
Net revenue | 102,925 | 95,442 | 94,046 | 98,771 | 111,633 | 98,863 | 93,921 | 96,456 | 391,184 | 400,873 | 369,574
Total expenses and other income | 75,298 | 79,208 | 74,615 | 74,382 | 74,940 | 70,983 | 70,522 | 67,448 | 303,503 | 283,893 | 249,382
Income from continuing operations |  |  |  |  | 26,941 | 19,528 | 16,015 | 22,954 | 60,710 | 85,438 | 84,479
Income (loss) from discontinued operations, net of tax |  |  |  |  | 0 | 0 | 0 | (272) | 0 | (272) | (633)
Net income | $ 19,410 | $ 11,173 | $ 13,339 | $ 16,788 | $ 26,941 | $ 19,528 | $ 16,015 | $ 22,682 | $ 60,710 | $ 85,166 | $ 83,846
Diluted income per share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax (diluted) (in dollars per share) |  |  |  |  | $ 0.94 | $ 0.68 | $ 0.55 | $ 0.78 | $ 2.14 | $ 2.94 | $ 2.86
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share) |  |  |  |  | 0.00 | 0.00 | 0.00 | (0.01) | 0.00 | (0.01) | (0.02)
Net income per diluted share (in dollars per share) | $ 0.69 | $ 0.40 | $ 0.47 | $ 0.59 | $ 0.94 | $ 0.68 | $ 0.55 | $ 0.77 | $ 2.14 | $ 2.93 | $ 2.84
Diluted weighted average shares | 28,097 | 28,224 | 28,411 | 28,620 | 28,804 | 28,805 | 29,341 | 29,342 | 28,326 | 29,070 | 29,574

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