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, 2011 years
Stock-Based Compensation [Abstract]
Options outstanding at beginning of year	1,371
Options outstanding at beginning of year, Weighted average exercise price	$ 71.48
Granted, Shares	76
Granted, Weighted average exercise price	$ 57.34
Exercised, Shares	(82)
Exercised, Weighted average exercise price	$ 46.15
Forfeited and expired, Shares	(60)
Forfeited and expired, Weighted average exercise price	$ 75.16
Options outstanding at end of year	1,305
Options outstanding at the end of year, price per share	$ 72.08
Options outstanding at end of year, Weighted average remaining contractual term (years)	3.6
Options outstanding at end of year, Aggregate intrinsic value	$ 3,610
Vested and expected to vest at end of year, Shares	1,297
Vested and expected to vest, Weighted average exercise price	$ 72.16
Vested and expected to vest, Weighted average remaining contractual term (years)	3.5
Vested and expected to vest, Aggregate intrinsic value	3,565
Exercisable at end of year, Shares	1,106
Exercisable, Weighted average exercise price	$ 74.89
Exercisable, Weighted average remaining contractual term (years)	2.8
Exercisable, Aggregate intrinsic value	$ 1,968