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Share-Based Compensation Plans (Schedule Of Activity In Management Stock Purchase Program) (Details) (Management Stock Purchase Program [Member], USD $)
12 Months Ended
Dec. 31, 2011
Management Stock Purchase Program [Member]
 
Number of shares outstanding, beginning balance 219,323
Number of shares, purchased 63,113
Number of shares, vested (58,254)
Number of shares, forfeited (6,230)
Number of shares outstanding, ending balance 217,952
Weighted average grant date fair value outstanding, beginning balance $ 40.83
Weighted average grant date fair value, granted $ 27.42
Weighted average grant date fair value, vested $ 66.30
Weighted average grant date fair value, forfeited $ 32.29
Weighted average grant date fair value outstanding, ending balance $ 30.38