Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

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,
	2021			2020			2021			2020
	Shares	Amount		Shares	Amount		Shares	Amount		Shares	Amount
Purchases of treasury shares	—	$	—	—	$	(2)	(32)	$	(12,975)	(59)	$	(15,484)
Stock option exercises	103	17,045		72	8,395		313	46,433		989	100,732
Employee stock plan purchases	9	3,557		11	3,032		26	9,757		31	8,209
Restricted stock units vested, net of withheld shares upon award settlement	5	$	(1,451)	2	$	(316)	104	$	(17,461)	45	$	(7,208)