Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Summary of details activity in our common stock

The following table details activity in our common stock (in thousands):

	Three Months Ended June 30,							Six Months Ended June 30,
	2019				2018			2019					2018
	Shares	Amount			Shares	Amount		Shares		Amount			Shares	Amount
Purchases of treasury shares	—	$	—		—	$	—	(72	)	$	(14,289	)	—	$	—
Stock option exercises	203	15,604			372	25,019		297		22,132			722	44,317
Employee stock plan purchases	13	2,260			11	1,962		28		4,609			23	3,760
Restricted stock units vested, net of withheld shares upon award settlement	27	$	(2,008	)	—	$	—	37		$	(3,381	)	—	$	—