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Acquisitions - Schedule of Pro Forma Information (Details) - Discovery Benefits and Noventis - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Total revenues | $ 441,807 | $ 397,408 | $ 842,789 | $ 779,234
Net income attributable to shareholders | $ 15,225 | $ 33,790 | $ 34,035 | $ 76,277
Net income attributable to shareholders per share: |  |  |  |
Basic (in dollars per share) | $ 0.35 | $ 0.78 | $ 0.79 | $ 1.77
Diluted (in dollars per share) | $ 0.35 | $ 0.77 | $ 0.78 | $ 1.75

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