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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Two Thousand Twenty One Acquisition |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |
Total revenues | $ 3,128,530 | $ 2,751,167 |
Income before income taxes | 779,533 | 653,270 |
Net income | $ 599,964 | $ 502,942 |
Net income per share: |  |  |
Basic | $ 2.13 | $ 1.78 |
Diluted | $ 2.12 | $ 1.77 |
Weighted average number of shares outstanding: |  |  |
Basic | 276,024 | 274,334 |
Diluted | 277,414 | 275,867 |
Two Thousand Twenty Acquisition |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |
Total revenues |  | $ 2,714,314 | $ 2,579,075
Income before income taxes |  | 650,618 | 576,355
Net income |  | $ 500,900 | $ 436,722
Net income per share: |  |  |
Basic |  | $ 1.77 | $ 1.55
Diluted |  | $ 1.76 | $ 1.54
Weighted average number of shares outstanding: |  |  |
Basic |  | 274,334 | 272,471
Diluted |  | 275,867 | 274,616
Two Thousand Nineteen Acquisition |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |
Total revenues |  |  | $ 2,447,401
Income before income taxes |  |  | 545,182
Net income |  |  | $ 412,974
Net income per share: |  |  |
Basic |  |  | $ 1.47
Diluted |  |  | $ 1.46
Weighted average number of shares outstanding: |  |  |
Basic |  |  | 272,471
Diluted |  |  | 274,616

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