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Stock-Based Employee Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award      
Number of stock-based compensation plans 3    
Maximum number of award to be granted per individual 500,000    
Maximum aggregate number of shares available under the employee stock purchase plan 800,000    
Purchase price for each share of common stock as percentage of the average of the market price 90.00%    
Shares of common stock issued under the ESPP plan 35,927 28,802 30,054
Weighted-average price of shares of common stock issued under the ESPP plan $ 25.58 $ 29.46 $ 27.87
Chief Executive Officer
     
Share-based Compensation Arrangement by Share-based Payment Award      
Quarterly issuance of common stock to Chief Executive Officer 10,086 10,086 10,086
Lower Limit
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period for options and restricted stock 4 years    
Upper Limit
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period for options and restricted stock 5 years    
Maximum expiry period for options 10 years    
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Number of target performance shares issued 329,088    
Actual payout as percentage of target for performance shares issued in period 94.00%    
2008 Equity Plan
     
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum number of shares authorized for issuance under stock-based compensation plans 11,000,000