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Stock-Based Compensation
6 Months Ended
Jun. 30, 2011
Stock-Based Compensation [Abstract]  
Stock-Based Compensation
14. Stock-Based Compensation
 
The following table presents the components of Stock-Based Compensation Expense for the three and six months ended June 30, 2011 and 2010:
 
   
Three Months Ended
  
Six Months Ended
 
   
June 30
  
June 30
 
   
2011
  
2010
  
2011
  
2010
 
Stock options and stock appreciation rights
 $570  $626  $1,077  $886 
Restricted share awards
  257   224   504   420 
Performance share awards
  388   222   694   263 
Share-based liabilities
  (24)  (64)  215   110 
Total Stock-Based Compensation Expense
 $1,191  $1,008  $2,490  $1,679 
 
During the first six months of 2011 we granted 27,665 restricted shares. The weighted average grant date fair value of each share awarded was $40.35. Restricted share awards generally have a three year vesting period from the effective date of the grant. The total fair value of shares vested during the six months ended June 30, 2011 and 2010 was $623 and $67, respectively.