Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Shares issued:
Shares issued at beginning of period, shares			95,523,230
Shares cancelled, shares			(1,936,812)
Shares issued at end of period, shares	93,586,418		93,586,418
Treasury shares:
Treasury shares issued at beginning of period, shares			4,563,595
Shares repurchased, shares	716,970	0	4,669,213	6,047,437
Shares issued out of treasury, shares			(683,862)
Shares cancelled, shares			(1,936,812)
Total treasury shares at end of period, shares	6,612,134		6,612,134
Total shares outstanding at end of year	86,974,284		86,974,284