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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 368,810 | $ 354,641 | $ 343,831 | $ 334,263 | $ 335,397 | $ 335,622 | $ 337,745 | $ 325,444 | $ 1,401,545 | $ 1,334,208 | $ 1,266,005
Income before income taxes | 133,053 | 130,890 | 124,904 | 119,638 | 115,082 | 120,588 | 133,810 | 131,000 | $ 508,485 | $ 500,480 | $ 489,662
Net income | $ 88,611 | $ 86,704 | $ 81,005 | $ 77,497 | $ 81,379 | $ 79,425 | $ 86,240 | $ 84,611 |  |  |
Basic earnings per common share | $ 0.55 | $ 0.54 | $ 0.50 | $ 0.48 | $ 0.49 | $ 0.48 | $ 0.52 | $ 0.51 | $ 2.07 | $ 2.00 | $ 1.89
Diluted earnings per common share | $ 0.55 | $ 0.53 | $ 0.49 | $ 0.47 | $ 0.48 | $ 0.47 | $ 0.51 | $ 0.50 | $ 2.03 | $ 1.96 | $ 1.85
Effective income tax rate | 33.40% | 33.80% | 35.20% | 35.20% | 29.30% | 34.10% | 35.60% | 35.40% | 34.30% | 33.70% | 34.90%
Extraordinary Item [Member] |  |  |  |  |  |  |  |  |  |  |
Extraordinary Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance fee associated with SEI-sponsored investment product | $ 12,286 |  |  |  |  |  |  |  |  |  |
Sub-advisory expense associated with SEI-sponsored investment product | 6,143 |  |  |  |  |  |  |  |  |  |
Profit from extraordinary item, net of tax | $ 4,091 |  |  |  |  |  |  |  |  |  |
Profit from extraordinary item, net of tax, per diluted share | $ 0.03 |  |  |  |  |  |  |  |  |  |

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