Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details)

v2.4.0.6
Stock-Based Compensation (Schedule Of Weighted Average Assumptions) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Y
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term, years 4.51 4.98 [1]
Expected stock price volatility 32.44% 30.87% [1]
Risk-free interest rate 0.87% 1.82% [1]
Expected dividend yield 1.80% 1.31% [1]
Weighted average grant date fair value $ 11.44 $ 15.89 [1]
Stock options granted 323,615 314,701
Simplified Method [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted   53,720
Vesting period fifth anniversary of the grant date  
[1] For the three months ended March 31, 2011, the Company granted two stock option grants totaling 53,720 shares that vest 100% on the fifth anniversary of the grant date. Because the Company did not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected term for these grants, the Company utilized the simplified method in developing an estimate of the expected term of these options.