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Stock Plans (Tables)
12 Months Ended
Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Weighted average for key assumptions in determining the fair value of options granted
             
    2011   2010   2009

Expected volatility

  68.2% - 68.2%   67.1% - 68.1%   54.6% - 64.5%

Weighted-average expected volatility

  68.2%   67.1%   56.2%

Expected dividends

  —     —     —  

Expected term (in years)

  5.1 - 5.1   4.9 - 5.1   5.0 - 5.1

Risk-free rate

  2.1% - 2.1%   1.3% - 2.6%   1.9% - 2.7%
Stock option activity
                 
          Weighted  
          Average  
    Number of     Exercise  

Stock Options

  Shares     Price  

Outstanding at January 1, 2011

    2,661,299     $ 27.73  

Granted

    204,600       34.30  

Exercised

    (198,034     22.48  

Canceled

    (135,381     41.85  
   

 

 

         

Outstanding at December 31, 2011

    2,532,484       27.92  
   

 

 

         

Exercisable at December 31, 2011

    1,765,521       30.19  
   

 

 

         
                 
          Weighted  
          Average  
          Grant-Date  

Restricted Stock Awards

  Shares     Fair Value  

Nonvested shares at January 1, 2011

    471,894     $ 18.92  

Granted

    281,780       33.26  

Vested

    (100,149     19.81  

Canceled

    (19,878     28.96  
   

 

 

         

Nonvested shares at December 31, 2011

    633,647       25.15  
   

 

 

         
                 
          Weighted  
          Average  
          Grant-Date  

LTIP Restricted Stock Units

  Shares     Fair Value  

Nonvested shares at January 1, 2011

    281,500     $ 30.48  

Granted

    —         —    

Vested

    —         —    

Canceled

    —         —    
   

 

 

         

Nonvested shares at December 31, 2011

    281,500       30.48  
   

 

 

         
                 
          Weighted  
          Average  
    Number of     Exercise  

LTIP Stock Options

  Shares     Price  

Outstanding at January 1, 2011

    76,666     $ 38.00  

Granted

    —         —    

Exercised

    —         —    

Canceled

    (76,666     38.00  
   

 

 

         

Outstanding at December 31, 2011

    —         —    
   

 

 

         

Exercisable at December 31, 2011

    —         —