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Share-Based Compensation Stock option Exercise price ranges (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options outstanding, shares 51,000 124,034 125,034
Options outstanding, weighted average remaining contractual life (Years) 10 months 17 days    
Options outstanding, weighted average exercise price $ 24.24 $ 22.43 $ 22.43
Exercisable shares 51,000 124,034  
Exercisable, weighted average exercise price $ 24.24 $ 22.43  
Range of exercise price $24.00 through $24.99
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of exercise prices, lower range limit $ 24.00    
Range of exercise prices, upper range limit $ 24.99    
Options outstanding, shares 39,000    
Options outstanding, weighted average remaining contractual life (Years) 9 months 18 days    
Options outstanding, weighted average exercise price $ 24.00    
Exercisable shares 39,000    
Exercisable, weighted average exercise price $ 24.00    
Range of exercise price $25.00 through $25.99
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of exercise prices, lower range limit $ 25.00    
Range of exercise prices, upper range limit $ 25.99    
Options outstanding, shares 12,000    
Options outstanding, weighted average remaining contractual life (Years) 1 year 1 month 17 days    
Options outstanding, weighted average exercise price $ 25.00    
Exercisable shares 12,000    
Exercisable, weighted average exercise price $ 25.00