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Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Summary of details activity in our common stock
The following table details activity in our common stock:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
SharesAmountSharesAmountSharesAmountSharesAmount
Purchases of treasury shares— $(2)— $— (59)$(15,484)(72)$(14,289)
Stock option exercises 72 8,395 395 40,163 989 100,732 691 62,295 
Employee stock plan purchases11 3,032 15 2,718 31 8,209 43 7,327 
Restricted stock units vested, net of withheld shares upon award settlement$(316)$(191)45 $(7,208)38 $(3,572)