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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Business Combinations [Abstract] |  |
Total revenues | $ 815,305 | $ 706,714
Income before income taxes | 239,217 | 206,723
Net income | $ 199,752 | $ 153,491
Net income per share: |  |
Basic | $ 0.71 | $ 0.54
Diluted | $ 0.70 | $ 0.54
Weighted average number of shares outstanding: |  |
Basic | 275,594 | 272,776
Diluted | 276,955 | 274,861

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