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Stock Plans (Disclosure Of Share-Based Compensation Arrangements By Share-based Payment Award) (Details) - Stock-Based Compensation Plan [Member] - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 7,950 4,120
Weighted-average grant date fair value $ 32.60 $ 27.00
Director Stock Incentive Plan - 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 3,200 2,000
Weighted-average grant date fair value $ 32.25 $ 27.00
Vesting period 1 year 1 year
Omnibus Plan [Member] | February 3, 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 3,300  
Weighted-average grant date fair value $ 32.25  
Vesting period 4 years  
Omnibus Plan [Member] | February 3, 2015 [Member] | Share-based Compensation Award, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, percentage per year 25.00%  
Omnibus Plan [Member] | February 17, 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 50  
Weighted-average grant date fair value $ 32.50  
Vesting period 1 year  
Omnibus Plan [Member] | May 19, 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 1,400  
Weighted-average grant date fair value $ 34.25  
Vesting period 4 years  
Omnibus Plan [Member] | May 19, 2015 [Member] | Share-based Compensation Award, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, percentage per year 25.00%  
Omnibus Plan [Member] | 2014 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted   2,120
Weighted-average grant date fair value   $ 27.00
Vesting period   4 years
Omnibus Plan [Member] | 2014 [Member] | Share-based Compensation Award, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, percentage per year   25.00%