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Share-Based Compensation Plans (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Number of Options Outstanding 47,000 71,597 145,209 213,103
Weighted Average Remaining Contractual Life (in years) 4 years 10 months 10 days      
Number of Options Exercisable 47,000      
Weighted Average Exercise Price Per Share Outstanding $ 23.19      
Weighted Average Exercise Price Per Share Exercisable $ 23.19      
Range One [Member]
       
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Range of Exercise Prices Per Share, Lower Limit $ 10.31      
Number of Options Outstanding 7,000      
Weighted Average Remaining Contractual Life (in years) 4 months 10 days      
Number of Options Exercisable 7,000      
Weighted Average Exercise Price Per Share Outstanding $ 10.31      
Weighted Average Exercise Price Per Share Exercisable $ 10.31      
Range Two [Member]
       
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Range of Exercise Prices Per Share $ 14.00      
Number of Options Outstanding 2,000      
Weighted Average Remaining Contractual Life (in years) 1 year 4 months 10 days      
Number of Options Exercisable 2,000      
Weighted Average Exercise Price Per Share Outstanding $ 14.00      
Weighted Average Exercise Price Per Share Exercisable $ 14.00      
Range Three [Member]
       
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Range of Exercise Prices Per Share, Lower Limit $ 22.07      
Range of Exercise Prices Per Share, Upper Limit $ 24.15      
Number of Options Outstanding 28,000      
Weighted Average Remaining Contractual Life (in years) 6 years 6 months 18 days      
Number of Options Exercisable 28,000      
Weighted Average Exercise Price Per Share Outstanding $ 23.85      
Weighted Average Exercise Price Per Share Exercisable $ 23.85      
Range Four [Member]
       
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Range of Exercise Prices Per Share $ 28.31      
Number of Options Outstanding 4,000      
Weighted Average Remaining Contractual Life (in years) 3 years 4 months 10 days      
Number of Options Exercisable 4,000      
Weighted Average Exercise Price Per Share Outstanding $ 28.31      
Weighted Average Exercise Price Per Share Exercisable $ 28.31      
Range Five [Member]
       
Share-Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Abstract]        
Range of Exercise Prices Per Share $ 34.77      
Number of Options Outstanding 6,000      
Weighted Average Remaining Contractual Life (in years) 4 years 4 months 28 days      
Number of Options Exercisable 6,000      
Weighted Average Exercise Price Per Share Outstanding $ 34.77      
Weighted Average Exercise Price Per Share Exercisable $ 34.77