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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |
Total revenues | $ 619,359 | $ 547,196 | $ 1,853,193 | $ 1,578,627
Income before income taxes | 152,038 | 147,351 | 438,289 | 385,327
Net income | $ 115,658 | $ 109,663 | $ 332,940 | $ 288,373
Net income per share: |  |  |  |
Basic (in dollars per share) | $ 0.41 | $ 0.39 | $ 1.18 | $ 1.04
Diluted (in dollars per share) | $ 0.41 | $ 0.39 | $ 1.17 | $ 1.02
Weighted average number of shares outstanding: |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma | 272,962 | 271,008 | 272,425 | 270,423
Pro Forma Weighted Average Shares Outstanding, Diluted | 275,075 | 275,282 | 274,529 | 275,614

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