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Stock Compensation Stock Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 3,703,283    
Stock dividend equivalents, net of taxes $ 2,709 $ 2,580 $ 2,480
Granted, Weighted Average Exercise Price (in dollars per share) $ 0.00 $ 15.58 $ 14.18
Option exercises in period, intrinsic value 129 2,051 673
Tax benefit of options exercised 52 821 269
Exercised, Weighted Average Exercise Price (in dollars per share) $ 8.66 $ 10.85 $ 9.87
Exercise of stock options 140 1,029 1,265
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 1,755 1,715 1,218
Total compensation cost not yet recognized $ 2,103    
Total compensation cost not yet recognized, period for recognition 1 year 5 months 1 day    
Non-Qualfied Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Issued in Period 0 503,843 115,763
Granted, Weighted Average Exercise Price (in dollars per share)     $ 14.18
Non-Qualfied Options [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Weighted Average Exercise Price (in dollars per share)   $ 14.41  
Non-Qualfied Options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Weighted Average Exercise Price (in dollars per share)   $ 15.65