Stock Compensation (Summary Of Option Activity During The Period) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Equity [Abstract]
Shares under option at beginning of period | shares	11,923
Shares under option, Granted | shares	0
Shares under option, Exercised | shares	(880)
Shares under option, Forfeited or expired | shares	(17)
Shares under option at end of period | shares	11,026
Shares under option, Exercisable | shares	7,532
Weighted-average exercise price of Shares under option at beginning of period (in dollars per share) | $ / shares	$ 33.03
Weighted-average exercise price of Shares under option, Granted (in dollars per share) | $ / shares	0.00
Weighted-average exercise price of Shares under option, Exercised (in dollars per share) | $ / shares	30.61
Weighted-average exercise price of Shares under option, Forfeited or expired (in dollars per share) | $ / shares	28.33
Weighted-average exercise price of Shares under option at end of period (in dollars per share) | $ / shares	33.23
Weighted-average exercise price of Shares under option, Exercisable (in dollars per share) | $ / shares	$ 30.93