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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of recognized stock-based compensation expense
The following table summarizes share-based compensation expense recognized:

   
Years ended December 31,
 
   
2011
  
2010
  
2009
 
           
Stock options
 $(83) $619  $827 
Restricted stock units
  6,693   1,849   869 
Phantom stock units
  222   175   74 
Total
 $6,832  $2,643  $1,770 
Schedule of unrecognized compensation cost, nonvested awards
The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at December 31, 2011 (amortization periods in years):

        
   
Unrecognized Compensation
Cost
    
     
   
Weighted Average Remaining Amortization Periods
 
        
Stock options
 $92   1.1 
Restricted stock units
  4,313   1.5 
Phantom stock units
  -   0.0 
Total
 $4,405     
Schedule of share based compensation, stock options, activity
The following table summarizes the Company’s stock option activity (number of options in thousands):

   
Years ended December 31,
 
   
2011
  
2010
  
2009
 
      
Weighted Average Exercise Price
     
Weighted Average Exercise Price
     
Weighted Average Exercise Price
 
   
Number
of
Options
  
Number
of
Options
  
Number
of
Options
 
 
 
Outstanding:
                  
Beginning of year
  1,254  $15.04   2,728  $19.84   3,904  $18.55 
Granted
  -   -   -   -   -   - 
Exercised
  (651)  14.87   -   -   -   - 
Cancelled or forfeited
  (219)  14.92   (1,733)  20.35   (1,176)  15.55 
Adjustment due to VPG spin-off*
  -   -   259   -   -   - 
End of year*
  384  $15.40   1,254  $15.04   2,728  $19.84 
                          
Vested and expected to vest*
  384       1,254       2,728     
                          
Exercisable:
                        
End of year*
  323       1,001       2,400     


* The weighted average exercise price of the stock options included in the line item “Adjustment due to VPG spin-off” is equal to the weighted average exercise price of such stock options prior to the spin-off, as reduced by the spin-off adjustment.  The weighted average exercise price of stock options outstanding, vested and expected to vest, and exercisable as of December 31, 2010 also reflects the decrease in the exercise price as a result of the spin-off adjustment.
Stock options outstanding and exercisable summarized by ranges of exercise prices
The following table summarizes information concerning stock options outstanding and exercisable at December 31, 2011 (number of options in thousands, contractual life in years):

       
Options Outstanding
 
Options Exercisable
           
Weighted Average Remaining
Contractual Life
           
             
Weighted Average Exercise Price
     
Weighted Average Exercise Price
                   
   
Number of Options
     
Number of Options
 
Exercise Price
         
                         
$7.89
 
 22
 
 0.67
 
 $7.89
 
 22
 
 $7.89
$11.54 - $14.33
 
 53
 
 3.18
 
 13.31
 
 43
 
 13.42
$16.29
 
 309
 
 1.67
 
 16.29
 
 258
 
 16.29
Total
 
 384
 
 1.82
 
 $15.40
 
 323
 
 $15.34
Unvested stock options
The following table summarizes information concerning unvested stock options (number of options in thousands):

   
Years ended December 31,
 
   
2011
  
2010
  
2009
 
      
Weighted Average Grant-date Fair Value
     
Weighted Average Grant-date Fair Value
     
Weighted Average Grant-date Fair Value
 
   
Number
of
Options
  
Number
of
Options
  
Number
of
Options
 
 
 
Unvested:
                  
Beginning of year
  253  $9.33   328  $9.93   447  $9.64 
Granted
  -   -   -   -   -   - 
Vested
  (192)  9.13   (81)  9.24   (93)  8.96 
Forfeited
  -   -   (19)  7.95   (26)  8.47 
Adjustment due to VPG spin-off*
  -   -   25   -   -   - 
End of year*
  61  $9.96   253  $9.33   328  $9.93 

* The weighted average grant date fair value of the stock options included in the line item “Adjustment due to VPG spin-off” is equal to the weighted average grant date fair value of such stock options prior to the spin-off, as reduced by the spin-off adjustment.  The weighted average grant date fair value of stock options outstanding as of December 31, 2010 also reflects the decrease in the grant date fair value as a result of the spin-off adjustment.
Restricted Stock Units Activity
RSU activity for the years ended December 31, 2011, 2010, and 2009 is presented below (number of RSUs in thousands):

   
Years ended December 31,
 
   
2011
  
2010
  
2009
 
      
Weighted Average Grant-date Fair Value
     
Weighted Average Grant-date Fair Value
     
Weighted Average Grant-date Fair Value
 
   
Number
of
RSUs
  
Number
of
RSUs
  
Number
of
RSUs
 
 
 
Outstanding:
                  
Beginning of year
  634  $9.61   155  $9.14   197  $9.88 
Granted
  423   16.57   509   10.87   36   5.20 
Vested
  (154)  11.25   (76)  9.68   (78)  9.20 
Cancelled or forfeited
  (12)  13.26   (14)  8.83   -   - 
Adjustment due to VPG spin-off*
  -   -   60   -   -   - 
End of year*
  891  $12.58   634  $9.61   155  $9.14 

* The weighted average grant date fair value per unit included in the line item “Adjustment due to VPG spin-off” is equal to the weighted average grant date fair value per unit of such RSUs prior to the spin-off, as reduced by the spin-off adjustment.  The weighted average grant date fair value per unit of RSUs outstanding as of December 31, 2010 also reflects the decrease in the grant date fair value as a result of the spin-off adjustment.
Summary of recognized stock-based compensation expense
RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):

     
 Vesting Date
 
 Number of RSUs
     
January 1, 2013
 
324
     
January 1, 2014
 
233
Phantom stock units activity under the 2007 Program as of December 31, 2011
The following table summarizes the Company’s phantom stock units activity for the years ended December 31, 2011, 2010, and 2009 (number of phantom stock units in thousands):

   
Years ended December 31,
 
   
2011
  
2010
  
2009
 
   
Number
of
Phantom
Stock Units
  
Grant-
date
Fair Value per Unit
  
Number
of
Phantom
Stock Units
  
Grant-
date
Fair Value per Unit
  
Number
of
Phantom
Stock Units
  
Number
of
Phantom
Stock Units
 
 
 
 
Outstanding:
                  
Beginning of year
  116      120      100    
Granted
  15  $14.78   20  $8.76   20  $3.70 
Redeemed for common stock
  (44)      (39)      -     
Adjustment due to VPG spin-off
  -       15       -     
End of year
  87       116       120     
                          
Available for future grants
  95       110       145