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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Combinations [Abstract] |  |  |  |
Total revenues | $ 773,593 | $ 690,002 | $ 2,329,567 | $ 2,019,218
Income before income taxes | 197,444 | 162,392 | 627,088 | 504,731
Net income | $ 147,065 | $ 137,245 | $ 489,355 | $ 392,135
Net income per share: |  |  |  |
Basic | $ 0.52 | $ 0.48 | $ 1.73 | $ 1.38
Diluted | $ 0.52 | $ 0.48 | $ 1.73 | $ 1.38
Weighted average number of shares outstanding: |  |  |  |
Basic | 276,215 | 275,515 | 275,840 | 273,803
Diluted | 277,553 | 276,933 | 277,146 | 275,338

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