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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 2,120,867 |
Income before income taxes |  | 545,182 | 496,076 |
Net income |  | $ 412,974 | $ 369,277 |
Net income per share: |  |  |  |
Basic |  | $ 1.47 | $ 1.33 |
Diluted |  | $ 1.46 | $ 1.31 |
Weighted average number of shares outstanding: |  |  |  |
Basic |  | 272,471 | 270,971 |
Diluted |  | 274,616 | 275,521 |
Two Thousand Eighteen Acquisition |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Total revenues |  |  | $ 2,259,812 | $ 2,193,169
Income before income taxes |  |  | 504,664 | 503,927
Net income |  |  | $ 375,670 | $ 447,796
Net income per share: |  |  |  |
Basic |  |  | $ 1.35 | $ 1.60
Diluted |  |  | $ 1.33 | $ 1.57
Weighted average number of shares outstanding: |  |  |  |
Basic |  |  | 270,971 | 272,580
Diluted |  |  | 275,521 | 277,586

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