Stock Compensation Plans (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 Y
SSARs Outstanding
Number of Shares	1,081,087
SSARs Exercisable
Exercisable as of Period End	504,787
Weighted Average Exercise Price, in dollars per share	$ 36.57
$21.45 - $32.01 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower limit	$ 21.45
Range of Exercise Prices, upper limit	$ 32.01
SSARs Outstanding
Number of Shares	247,250
Weighted Average Remaining Contractual Life	3.2
Weighted Average Exercise Price, in dollars per share	$ 22.14
SSARs Exercisable
Exercisable as of Period End	173,500
Weighted Average Exercise Price, in dollars per share	$ 22.12
$33.65 - $44.55 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower limit	$ 33.65
Range of Exercise Prices, upper limit	$ 44.55
SSARs Outstanding
Number of Shares	286,150
Weighted Average Remaining Contractual Life	3.1
Weighted Average Exercise Price, in dollars per share	$ 35.30
SSARs Exercisable
Exercisable as of Period End	192,500
Weighted Average Exercise Price, in dollars per share	$ 35.92
$47.89 - $56.98 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, lower limit	$ 47.89
Range of Exercise Prices, upper limit	$ 56.98
SSARs Outstanding
Number of Shares	547,687
Weighted Average Remaining Contractual Life	5.3
Weighted Average Exercise Price, in dollars per share	$ 53.40
SSARs Exercisable
Exercisable as of Period End	138,787
Weighted Average Exercise Price, in dollars per share	$ 55.54