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Shareholders' Equity
9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Shareholders' Equity Shareholders’ Equity
The following table details activity in our common stock (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
SharesAmountSharesAmountSharesAmountSharesAmount
Purchases of treasury shares— $— — $— — $— (32)$(12,975)
Stock option exercises 39 4,990 103 17,045 140 21,213 313 46,433 
Employee stock plan purchases16 4,458 3,557 36 12,614 26 9,757 
Restricted stock units vested, net of withheld shares upon award settlement(585)(1,451)132 (20,915)104 (17,461)
As of September 30, 2022, we have authorization from our board of directors to repurchase up to 2.4 million additional shares of our common stock.