XML 42 R97.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 80,000,000 80,000,000  
Shares available for future grants 1,743,494    
Net proceeds from exercise of stock options $ 1.8 $ 0.4 $ 2.0
Exercised, shares 198,900 48,400 204,245
First Amended And Restated Two Thousand And Four Long Term Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 2,700,000    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, shares 198,900 48,400 204,245
Income tax benefits realized from the exercise of stock options 2.2 0.7 1.9
Restricted Stock Units R S U [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received for the payment of taxes upon issuance of restricted stock units 63,066 22,339 23,330
Shares received for the payment of taxes upon issuance of restricted stock units, value 2.6 0.9 0.9
Compensation expenses 4.8 4.9 3.8
Compensation expenses net of tax 3.0 3.1 2.4
Unrecognized compensation cost 10.3    
Unrecognized compensation cost, weighted average period (in years) 2 years 4 months    
Outstanding aggregate intrinsic value 30.6    
Vested aggregate intrinsic value $ 12.1    
Restricted Stock Units R S U [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted Stock Units R S U [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 15 years