Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details)	3 Months Ended
	Mar. 31, 2017 shares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued at beginning of year	93,586,418
Shares cancelled, shares	0
Shares issued at end of year	93,586,418
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury shares issued at beginning of year	6,488,298
Shares repurchased, shares	0
Shares issued out of treasury, shares	(385,595)
Shares cancelled, shares	0
Total treasury shares at end of year	6,102,703
Total shares outstanding at end of year	87,483,715