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Employee Benefits and Share-Based Compensation - Assumptions Used to Value Stock Options Granted (Details) - Stock Options
6 Months Ended
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected life 4 years 10 months 24 days
Expected volatility 30.10%
Risk-free interest rate 0.60%
Estimated forfeiture rate 7.90%
Dividend yield 0.00%