Stock-Based Compensation (Summary Of Stock Options Under The 2007 Plan) (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
Granted, Shares	83	76	40
Exercised, Shares	(277)	(82)	(74)
Forfeited and expired, Shares	(116)	(60)	(76)
Options outstanding at end of year, shares	995	1,305	1,371
Vested and expected to vest at end of year, Shares	989
Exercisable at end of year, Shares	814	1,106	1,160
Weighted average exercise price
Options outstanding at beginning of year, Weighted average exercise price	$ 72.08
Granted, Weighted average exercise price	$ 66.14	$ 57.34	$ 46.80
Exercised, Weighted average exercise price	$ 60.76
Forfeited and expired, Weighted average exercise price	$ 70.93
Options outstanding at the end of year, price per share	$ 74.87	$ 72.08
Vested and expected to vest, Weighted average exercise price	$ 74.95
Exercisable, Weighted average exercise price	$ 77.78
Additional Disclosures
Options outstanding at end of year, Weighted average remaining contractual term (years)	3 years 10 months 24 days
Vested and expected to vest, Weighted average remaining contractual term (years)	3 years 10 months 24 days
Exercisable, Weighted average remaining contractual term (years)	3 years
Options outstanding at end of year, Aggregate intrinsic value	$ 15,643
Vested and expected to vest, Aggregate intrinsic value	15,453
Exercisable, Aggregate intrinsic value	$ 10,437