Common Stock and Stock-Based Awards Plans (Summary Of Stock-Based Awards) (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, shares or units, beginning balance | shares	1,026
Granted, shares or units | shares	486
Vested, shares or units | shares	(351)
Forfeited, shares or units | shares	(74)
Non-vested shares outstanding, shares or units, ending balance | shares	1,087
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 27.35
Granted, weighted-average grant date fair value | $ / shares	28.62
Vested, weighted-average grant date fair value | $ / shares	26.71
Forfeited, weighted-average grant date fair value | $ / shares	28.50
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 28.05
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, shares or units, beginning balance | shares	368
Granted, shares or units | shares	234	[1]
Forfeited, shares or units | shares	(60)
Non-vested shares outstanding, shares or units, ending balance | shares	542
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 27.93
Granted, weighted-average grant date fair value | $ / shares	28.60	[1]
Forfeited, weighted-average grant date fair value | $ / shares	29.38
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 28.06

[1] Represents target number of units that can vest based on the achievement of the performance goals.