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Stock-Based Compensation (Stock Appreciation Rights) (Details) (SARs, USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 21,292 22,849
Number of Shares Subject to SARs Outstanding & Exercisable 21,292  
Weighted-Average Remaining Contractual Life 4 years 2 months 1 day  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 25.96 $ 25.85
Forfeited (in shares) 1,557  
Forfeited (in dollars per share) $ 25.99  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 4 years 2 months 1 day  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Intrinsic Value $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Number 21,292  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Exercise Price $ 25.96  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Remaining Contractual Terms 4 years 2 months 1 day  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Intrinsic Value $ 0  
Exercise Price $23.26
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (usd per share) $ 23.26  
Number of Shares Subject to SARs Outstanding & Exercisable 2,000  
Weighted-Average Remaining Contractual Life 4 years 1 month 1 day  
Exercise Price $23.77
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (usd per share) $ 23.77  
Number of Shares Subject to SARs Outstanding & Exercisable 10,582  
Weighted-Average Remaining Contractual Life 4 years 7 months 1 day  
Exercise Price $29.25
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (usd per share) $ 29.25  
Number of Shares Subject to SARs Outstanding & Exercisable 8,710  
Weighted-Average Remaining Contractual Life 3 years 7 months 1 day