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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Sustainable Growth Advisers, LP |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total Revenues | $ 152,210 | $ 131,307 | $ 431,400 | $ 317,879
Net Income (Loss) Attributable to Common Stockholders | $ 26,201 | $ 16,493 | $ 69,284 | $ 22,897
Basic EPS (in dollars per share) | $ 3.65 | $ 2.29 | $ 9.63 | $ 3.30
Diluted EPS (in dollars per share) | $ 3.35 | $ 2.19 | $ 8.93 | $ 3.19
RidgeWorth |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total Revenues |  | $ 118,010 |  | $ 361,070
Net Income (Loss) Attributable to Common Stockholders |  | $ 13,696 |  | $ 29,975
Basic EPS (in dollars per share) |  | $ 1.74 |  | $ 3.42
Diluted EPS (in dollars per share) |  | $ 1.70 |  | $ 3.31

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