Common Stock and Stock-Based Awards Plans (Summary Of Stock-Based Awards) (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / 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	893
Granted, shares or units | shares	525
Vested, shares or units | shares	(283)
Forfeited, shares or units | shares	(41)
Non-vested shares outstanding, shares or units, ending balance | shares	1,094
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 28.06
Granted, weighted-average grant date fair value | $ / shares	26.61
Vested, weighted-average grant date fair value | $ / shares	27.56
Forfeited, weighted-average grant date fair value | $ / shares	28.56
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 27.47
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	384
Granted, shares or units | shares	165
Forfeited, shares or units | shares	(181)
Non-vested shares outstanding, shares or units, ending balance | shares	368
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 28.89
Granted, weighted-average grant date fair value | $ / shares	28.02
Forfeited, weighted-average grant date fair value | $ / shares	30.04
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 27.93