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Stock Options (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (years) 1 year      
Qualified Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Shares, Total 330,730 377,480 360,130 345,480
Granted 61,000 35,000 19,000  
Wieghted average grant date fair value of options granted $ 14.76 $ 12.50 $ 11.40  
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 1,048      
Period cost is expected to be recognized (years) 5 years      
Exercise of stock options, shares 99,650 15,650 4,350  
Non Qualified Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Shares, Total 89,700 112,800 102,400 186,000
Granted 0 30,000 0  
Award vesting period (years) 1 year      
Wieghted average grant date fair value of options granted   $ 12.50    
Total unrecognized compensation cost related to non-vested share-based compensation arrangements 273      
Period cost is expected to be recognized (years) 5 years      
Exercise of stock options, shares 23,100 14,600 78,600  
Proceeds from stock options exercised 315 167 984  
Tax deductions from the exercise of stock options 284 178 796  
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage of award 25.00%      
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 98      
Period cost is expected to be recognized (years) 4 years      
Weighted average remaing contractual life (years) 2 years 7 months 24 days 3 years 5 months 23 days 3 years 3 months 29 days  
1994 Incentive Stock Option Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage of award 20.00%      
Options Outstanding, Shares, Total 39,580      
2005 Incentive Stock Option Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage of award 20.00%      
Granted 61,000,000 35,000,000 19,000,000  
2005 Incentive Stock Option Plan | Qualified Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock reserved for options to be issued 500,000      
2009 Equity Incentive Plan | Non Qualified Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage of award 20.00%      
Shares of common stock reserved for options to be issued 400,000