Stock-Based Compensation Plans (Summary Of Grants Under Long Term Incentive Plan) (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Compensation cost charged to income in 2011		$ 192,000	$ 349,000	$ 567,000	$ 1,300,000
Expected dividend yield	0.50%			0.60%	0.50%
Expected volatility	62.30%
Risk-free rate	1.10%			1.20%	2.70%
Expected option life (in years)	4.4			6.1	6.2
Long-Term Incentive Program [Member]
Target value	13,436,000
Maximum value	23,513,000
Compensation cost charged to income in 2011	724,000
Performance-Vested Cash [Member]
Target value	6,718,000
Maximum value	13,436,000
Compensation cost charged to income in 2011	362,000
Performance-vested Stock Units [Member]
Target # of shares / units granted	101,000
Target value	3,359,000
Maximum # of shares / units granted	202,000
Maximum value	6,718,000
Weighted average stock price at grant	33.28
Weighted average fair value at grant	33.28
Compensation cost charged to income in 2011	181,000
Time Vested Stock Options [Member]
Target # of shares / units granted	211,000
Target value	3,359,000
Maximum # of shares / units granted	211,000
Maximum value	3,359,000
Weighted average stock price at grant	33.28
Weighted average fair value at grant	15.93
Compensation cost charged to income in 2011	181,000