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Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 185,203 | $ 173,379 | $ 142,354 | $ 159,912 | $ 178,257 | $ 148,700 | $ 131,505 | $ 133,629 | $ 660,848 | $ 592,091 | $ 513,997
Cost of revenue | 85,011 | 79,404 | 58,207 | 68,652 | 79,200 | 63,518 | 57,379 | 56,456 | 291,274 | 256,553 | 224,742
Net revenue | 100,192 | 93,975 | 84,147 | 91,260 | 99,057 | 85,182 | 74,126 | 77,173 | 369,574 | 335,538 | 289,255
Total expenses and other income | 64,377 | 64,524 | 60,387 | 60,094 | 58,116 | 55,294 | 49,243 | 50,648 | 249,382 | 213,301 | 182,168
Income from continuing operations | 25,518 | 23,127 | 15,654 | 20,180 | 27,612 | 19,578 | 16,297 | 17,375 | 84,479 | 80,862 | 70,137
Income (loss) from discontinued operations, net of tax | (740) | 14 | 9 | 84 | (3) | (689) | 52 | 137 | (633) | (503) | 7,645
Net income | $ 24,778 | $ 23,141 | $ 15,663 | $ 20,264 | $ 27,609 | $ 18,889 | $ 16,349 | $ 17,512 | $ 83,846 | $ 80,359 | $ 77,782
Diluted income per share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax (diluted) (in dollars per share) | $ 0.87 | $ 0.79 | $ 0.53 | $ 0.68 | $ 0.93 | $ 0.67 | $ 0.56 | $ 0.57 | $ 2.86 | $ 2.72 | $ 2.23
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share) | $ (0.03) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.03) | $ 0.00 | $ 0.01 | $ (0.02) | $ (0.02) | $ 0.24
Net income per diluted share (in dollars per share) | $ 0.84 | $ 0.79 | $ 0.53 | $ 0.68 | $ 0.93 | $ 0.64 | $ 0.56 | $ 0.58 | $ 2.84 | $ 2.70 | $ 2.47
Diluted weighted average shares | 29,393 | 29,353 | 29,603 | 29,955 | 29,666 | 29,430 | 29,404 | 30,353 | 29,574 | 29,713 | 31,498

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