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Share-Based Compensation Plans Share-Based Compensation Plans - Nonvested Stock Option Activity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at beginning of year 103
Granted 0
Vested (63)
Nonvested at end of year 40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value  
Nonvested at beginning of year $ 13.67
Granted $ 0.00
Vested $ 13.65
Nonvested at end of year $ 13.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Forfeitures and Expirations in Period, Weighted Average Grant Date Fair Value $ 0.00
Common Stock
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 500,000
Recognization of share-based compensation expenses, weighted average period 1 year
Total fair value of shares vested $ 900,000