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Stock Incentive Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | $ 180,739 | $ 160,743 | $ 142,660
Property and equipment (capitalized internal-use software) | 4,492 | 0 | 0
Total share-based compensation expense | 185,231 | 160,743 | 142,660
Restricted stock units |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | 99,648 | 76,094 | 59,652
Stock options |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | 26,323 | 28,816 | 31,231
Executive Chairman Long-Term Performance Award | Chief Executive Officer |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | 53,214 | 53,214 | 38,189
Employee Stock Purchase Plan |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | 1,554 | 2,619 | 1,946
Secondary sales of common stock |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Share-based compensation recorded within Compensation and benefits | $ 0 | $ 0 | $ 11,642

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