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Stock Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2012
Stock Incentive Plans [Abstract]  
Stock Options Valuation Assumptions
The fair values of these grants were estimated at the respective grant dates using a Black-Scholes option-pricing model with the following assumptions:
 
   
2012
 
2011
 
2010
Dividend rate
 
3.05%
 
1.99%
 
1.90%
Risk-free interest rate
 
1.22%
 
2.73%
 
2.45%
Expected lives of options
 
6.25 years
 
6.25 years
 
6.25 years
Price volatility
 
38.80%
 
38.45%
 
39.48%

Summary of Outstanding Options
A summary of outstanding options at December 31, 2012, 2011 and 2010, and changes during the years ended on those dates, is as follows:

   
Options
  
Weighted Average Grant Price Per Option
  
Fair Value Per Option
 
           
Outstanding December 31, 2009
  338,482   18.79    
             
Granted
  69,222   16.50  $5.70 
Cancelled
  (7,381)  25.26     
Exercised
  (59,215)  10.10     
Outstanding December 31, 2010
  341,108   19.69     
              
Granted
  81,343   16.58  $5.62 
Cancelled
  (10,557)  21.87     
Exercised
  (5,000)  7.34     
Outstanding December 31, 2011
  406,894  $19.16     
              
Granted
  151,522   10.82  $3.02 
Cancelled
  (8,728)  25.26     
Exercised
  (55,000)  7.34     
Outstanding December 31, 2012
  494,688  $17.82     

Performance Stock Awards Valuation assumptions
Due to the market condition of achieving a target stock price in order to vest, the Company determined the grant date fair value of the performance shares, as well as the expected term of the awards, using a Monte Carlo simulation.  The following assumptions were used in deriving the grant date fair value and expected term:

   
Management Shares
  
Employee Shares
 
Assumptions:
      
Dividend rate
  1.5%  1.5%
Risk free rate
  4.44%  4.38%
Annual price volatility
  34%  34%
          
Derived values:
        
Fair value per share
 $13.20  $12.20 
Expected term (years)
  5.81   5.38 

Share Grant Activity
A summary of outstanding share grants at December 31, 2012, 2011, and 2010, and changes during the years ended on those dates, is as follows:
 
   
Shares
 
     
Outstanding December 31, 2009
  55,946 
      
Granted
  41,415 
Cancelled
  (3,261)
Vested and issued
  - 
Outstanding December 31, 2010
  94,100 
      
Granted
  78,707 
Cancelled
  (6,733)
Vested and issued
  (18,931)
Outstanding December 31, 2011
  147,143 
      
Granted
  119,354 
Cancelled
  (8,098)
Vested and issued
  (45,045)
Outstanding December 31, 2012
  213,354