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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Total revenues | $ 677,161 | $ 648,063 | $ 2,010,160 | $ 1,900,105
Income before income taxes | 159,607 | 160,623 | 505,799 | 449,916
Net income | $ 134,891 | $ 122,189 | $ 392,964 | $ 341,772
Net income per share: |  |  |  |
Basic | $ 0.48 | $ 0.43 | $ 1.39 | $ 1.21
Diluted | $ 0.47 | $ 0.43 | $ 1.38 | $ 1.21
Weighted average number of shares outstanding: |  |  |  |
Basic | 275,515 | 272,962 | 273,803 | 272,425
Diluted | 276,933 | 275,075 | 275,338 | 274,529

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