Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation Options (Details)

v2.4.0.6
Stock Based Compensation Options (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Options, Vesting Percentage, After Year One 50.00%      
Stock Options, Expiration in Years 10      
Options outstanding, beginning 145,950 314,250 317,000  
Weighted average exercise price, beginning $ 27.69 $ 26.74 $ 25.39 $ 25.31
Stock Options, granted 0 0 0  
Stock Options, granted, weighted average exercise price $ 0.00 $ 0.00 $ 0.00  
Options exercised (51,081) (164,300) (2,750)  
Stock Options, exercised, weighted average exercise price $ 25.29 $ 24.11 $ 16.34  
Stock Options, expired/forfeited (5,763) (4,000) 0  
Stock Options, expired/forfeited, weighted average exercise price $ 24.85 $ 28.23 $ 0.00  
Options outstanding, ending 89,106 145,950 314,250  
Weighted average exercise price, ending $ 27.69 $ 26.74 $ 25.39 $ 25.31
Stock Options, exercisable 89,106 145,950 314,250  
Stock Options, weighted average exercise price $ 27.69 $ 26.74 $ 25.39  
Aggregate intrinsic value of outstanding exercisable shares $ 0      
Aggregate intrinsic value of options exercised $ 0.3 $ 1.0    
Employee Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price, minimum $ 25.61      
Exercise price, maximum $ 33.09      
Weighted average remaining contractual term, options outstanding (years) 1.5      
Weighted average exercise price, beginning $ 27.69      
Weighted average exercise price, ending $ 27.69