Stock Purchase And Award Plans (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Stock Purchase And Award Plans [Abstract]
Share, Outstanding at beginning of year	1,560
Shares, Granted	34
Shares, Exercised	(100)
Shares, Forfeited or Expired	(11)
Shares, Outstanding at end of year	1,483
Shares, Vested or expected to vest at end of year	1,483
Shares, Exercisable at end of year	1,465
Weighted Average Exercise Price, Outstanding at beginning of year	$ 38.13
Weighted Average Exercise Price, Granted	$ 50.78
Weighted Average Exercise Price, Exercised	$ 34.43
Weighted Average Exercise Price, Forfeited or Expired	$ 36.60
Weighted Average Exercise Price, Outstanding at end of year	$ 38.68
Weighted Average Exercise Price, Vested or expected to vest at end of year	$ 38.68
Weighted Average Exercise Price, Exercisable at end of year	$ 38.54
Aggregate Intrinsic Value, Outstanding at end of year	$ 270
Aggregate Intrinsic Value, Vested or expected to vest at end of year	270
Aggregate Intrinsic Value, Exercisable at end of year	$ 270
Weighted Average Contractual Term (Years), Outstanding at end of year	4.4
Weighted Average Contractual Term (Years), Vested or expected to vest at end of year	4.4
Weighted Average Contractual Term (Years), Exercisable at end of year	4.4