Stock-Based Compensation (Schedule Of Stock Option Plans Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares
Options outstanding at beginning of year, shares	1,305	1,371	1,481
Options granted	83	76	40
Options exercised	(277)	(82)	(74)
Options forfeited and expired	(116)	(60)	(76)
Options outstanding at end of year, shares	995	1,305	1,371
Options exercisable at end of year	814	1,106	1,160
Options granted during the year, price per share	$ 66.14	$ 57.34	$ 46.80
Options exercised during the year, price per share	$ 60.76
Options outstanding at the end of year, price per share	$ 74.87	$ 72.08
Options exercisable at end of year, price per share	$ 77.78
Minimum [Member]
Shares
Options exercised during the year, price per share	$ 28.37	$ 28.37	$ 16.66
Options forfeited and expired during the year, price per share	$ 46.80	$ 28.37	$ 22.63
Options outstanding at the end of year, price per share	$ 28.37	$ 28.37	$ 28.37
Options exercisable at end of year, price per share	$ 28.37	$ 28.37	$ 28.37
Maximum [Member]
Shares
Options exercised during the year, price per share	$ 93.65	$ 63.14	$ 57.88
Options forfeited and expired during the year, price per share	$ 93.65	$ 93.65	$ 93.65
Options outstanding at the end of year, price per share	$ 93.65	$ 93.65	$ 93.65
Options exercisable at end of year, price per share	$ 93.65	$ 93.65	$ 93.65