Taxes on Income (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Company's provision for taxes on income varied from the statutory federal income tax rate [Abstract]
United States income tax statutory rate (in hundredths)	35.00%	35.00%	35.00%
State and local taxes, net of federal benefit (in hundredths)	2.80%	2.20%	2.90%
Other - net (in hundredths)	(0.20%)	(0.10%)	0.20%
Effective income tax rate (in hundredths)	37.60%	37.10%	38.10%