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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Stock-Based Compensation [Abstract]  
Stock based compensation expense
                         
    Stock Based Compensation  
    2009     2010     2011  

Stock options

  $ 943     $ 1,414     $ 2,553  

Restricted stock units

    1,667       745       1,214  

Performance stock units

    2,809       4,686       366  
   

 

 

   

 

 

   

 

 

 

Total stock-based compensation

  $ 5,419     $ 6,845     $ 4,133  
   

 

 

   

 

 

   

 

 

 
The fair value of options granted
                         
    2009     2010     2011  

Risk-free interest rate

    2.2     2.8     2.7

Dividend yield

    2.7     2.2     1.8

Expected volatility of the Company's common stock

    0.568       0.604       0.615  

Expected life in years

    6.0       6.0       6.0  
Details of the stock option activity
                         
          Weighted     Aggregate  
          Average     Intrinsic  
    Number of     Exercise     Value  
    Shares     Price (per share)     (thousands)  

Outstanding at January 1, 2011

    1,779,184     $ 12.21          

Granted

    311,670       23.10          

Exercised

    (315,785     12.85          

Expired

    (3,000     7.70          

Cancelled

    (34,188     17.49          
   

 

 

                 

Outstanding at December 31, 2011

    1,737,881       13.95     $ 6,275  
   

 

 

                 

Exercisable at December 31, 2011

    949,966       12.81       3,610  
   

 

 

                 

Available for Grant at December 31, 2011

    3,546,110                  
   

 

 

                 

 

                         
    Year ended December 31  
    2009     2010     2011  

Weighted average grant-date fair value of options granted (per share)

  $ 2.08     $ 9.01     $ 11.57  
   

 

 

   

 

 

   

 

 

 

Aggregate intrinsic value of options exercised (thousands)

  $ 116     $ 5,279     $ 3,515  
   

 

 

   

 

 

   

 

 

 

Total fair value of shares vested (thousands)

  $ 414     $ 899     $ 1,655  
   

 

 

   

 

 

   

 

 

 
Segregated disclosure of options outstanding
                         
    Range of Exercise Prices  
    Less than or     Greater than $12.52 and     Greater than or  
    equal to $12.52     less than $19.33     equal to $19.33  

Options outstanding

    681,000       479,169       577,712  
       

Weighted average exercise price

  $ 4.82     $ 17.17     $ 22.05  
       

Remaining contractual life

    7.3       5.8       6.1  
       

Options exercisable

    391,000       291,424       267,542  
       

Weighted average exercise price

  $ 4.82     $ 16.18     $ 20.82  
Details of restricted stock unit activity
                 
          Weighted  
          Average  
    Number of     Grant-Date  
    Restricted     Fair Value  
    Units     (per share)  

Nonvested at January 1, 2011

    140,405     $ 16.05  

Granted

    100,400       23.68  

Vested

    (55,837     14.53  

Settled

    —            

Cancelled

    (3,846     8.47  

Accrued dividend equivalents

    5,683       14.22  
   

 

 

         

Nonvested at December 31, 2011

    186,805     $ 20.70  
   

 

 

         

 

                         
    Year ended December 31  
    2009     2010     2011  

Weighted average grant-date fair value of restricted shares granted (per share)

  $ 16.62     $ —       $ 23.68  
   

 

 

   

 

 

   

 

 

 

Total fair value of shares vested (thousands)

  $ 545     $ 5,117     $ 811  
   

 

 

   

 

 

   

 

 

 
Performance based units earned under Long-Term
         

Performance stock units outstanding at January 1, 2011

    60,082  
   

Performance stock units cancelled

    (325

Accrued dividend equivalents

    1,693  
   

 

 

 

Performance stock units outstanding at December 31, 2011

    61,450