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Share-Based Compensation and Equity (Textuals) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common Stock, Dividends, Per Share, Declared $ 1.12 $ 1.08 $ 1.04
Common Stock, Dividends, Per Share, Cash Paid $ 1.12 $ 1.08 $ 1.04
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 7,873,644    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,045,311    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 936 $ 510 $ 422
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.90 $ 9.46 $ 7.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 2,967 3,059 3,045
Proceeds from Stock Options Exercised 4,043 3,332 1,514
Net expense tax detriment from share-based compensation (1,362) 1,705 1,160
Stock Options [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Aware, Expiration Period 10 years    
Net expense tax detriment from share-based compensation $ (1,362) $ 1,705 $ 1,160
Stock Options [Member] | Minimum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Stock Options [Member] | Maximum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Restricted Stock Units [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Conversion to Common Stock (shares) 1    
Restricted Stock Units [Member] | Minimum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock Units [Member] | Maximum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 7 years    
Performance Shares [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 3 years    
Conversion to Common Stock (shares) 1    
Director Deferred Shares [Member] | Minimum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 months    
Director Deferred Shares [Member] | Maximum [Member]
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 12 months