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Stockholders' Equity - Stock Options - Fair Value Assumptions (Details) - Stock Options
6 Months Ended
Jun. 30, 2022
Fair value assumptions  
Risk free rate of return, minimum (as a percent) 1.69%
Risk free rate of return, maximum (as a percent) 3.03%
Expected share price volatility, minimum (as a percent) 39.79%
Expected share price volatility, maximum (as a percent) 41.81%
Expected life in years 5 years 10 months 20 days
Dividend yield (as a percent) 0.00%