Stock Compensation (Summary Of Option Activity During The Period) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Equity [Abstract]
Shares under option at beginning of period | shares	9,061
Shares under option, Granted | shares	1
Shares under option, Exercised | shares	(987)
Shares under option, Forfeited or expired | shares	(27)
Shares under option at end of period | shares	8,048
Shares under option, Exercisable | shares	6,769
Weighted-average exercise price of Shares under option at beginning of period (in dollars per share) | $ / shares	$ 34.33
Weighted-average exercise price of Shares under option, Granted (in dollars per share) | $ / shares	41.57
Weighted-average exercise price of Shares under option, Exercised (in dollars per share) | $ / shares	27.43
Weighted-average exercise price of Shares under option, Forfeited or expired (in dollars per share) | $ / shares	28.82
Weighted-average exercise price of Shares under option at end of period (in dollars per share) | $ / shares	35.20
Weighted-average exercise price of Shares under option, Exercisable (in dollars per share) | $ / shares	$ 34.88