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Note I - Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Common Stock authorized     9,144,000  
         
Stock based awards, including restricted stock and stock options granted, net of expired or cancelled     6,449,000  
         
Common Stock available for grant of stock based awards as of December 31, 2011     2,695,000  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Years Ended December 31,

 
   

2011

   

2010

   

2009

 
Stock options   $ 5,787     $ 3,724     $ 1,560  
Restricted stock     5,617       4,547       4,380  
                         
Total   $ 11,404     $ 8,271     $ 5,940  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used
   

2011

   

2010

   

2009

 
Volatility   43% to 49%     47% to 52%     49% to 52%  
Risk free interest rate   0.61% to 1.78%     0.84% to 2.16%     1.39% to 2.09%  
Expected life in years   2 to 4     3 to 4     3 to 4  
Dividend yield   0     0     0  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Number of Shares

   

Weighted Average Exercise Price

 

Weighted Average Remaining Contractual Term

 

Aggregate Intrinsic Value

Outstanding at January 1, 2009     1,737,000     $ 7.19        
Granted     1,320,000       10.42        
Exercised     (594,000 )     6.44        
Cancelled/Forfeited     (40,000 )     7.73        
                       
Outstanding at December 31, 2009     2,423,000       9.12        
Granted     971,000       22.49        
Exercised     (647,000 )     8.00        
Cancelled/Forfeited     (44,000 )     16.03        
                       
Outstanding at December 31, 2010     2,703,000       14.08        
Granted     618,000       29.93        
Exercised     (439,000 )     11.39        
Cancelled/Forfeited     (179,000 )     19.42        
                       
Outstanding at December 31, 2011     2,703,000     $ 17.79  

4.6 years

  $         45,397
                       
Exercisable at December 31, 2011     863,000     $ 15.36  

4.0 years

  $         16,613
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
   

Options Outstanding

 

Options Exercisable

 

Range of Exercise Price

 

Number Outstanding

 

Weighted Average Remaining Contractual Life (in Years)

 

Weighted Average Exercise Price

 

Number Exercisable

 

Weighted Average Exercise Price

 
$  5.25 to $11.85   1,050,000   3.8   $ 8.27   436,000   $ 8.11  
$11.86 to $18.45   442,000   4.6     15.54   152,000     15.32  
$18.46 to $25.05   529,000   4.9     23.27   184,000     23.24  
$25.06 to $31.65   500,000   6.0     27.43   17,000     26.95  
$31.66 to $38.25   182,000   4.6     35.81   75,000     35.62  
      2,703,000   4.6   $ 17.79   863,000   $ 15.36  
Schedule of Nonvested Share Activity [Table Text Block]
   

Number of Shares

   

Weighted Average Fair Value at Grant Date

 
                 
Outstanding at January 1, 2009     806,000     $ 13.13  
Granted     201,000       15.61  
Vested     (329,000 )     11.49  
Forfeited     (7,000 )     16.26  
                 
Outstanding at December 31, 2009     671,000       13.98  
Granted     254,000       23.39  
Vested     (348,000 )     13.01  
Forfeited     (15,000 )     18.99  
                 
Outstanding at December 31, 2010     562,000       17.20  
Granted     383,000       31.65  
Vested     (239,000 )     15.56  
Forfeited     (35,000 )     28.44  
                 
Outstanding at December 31, 2011     671,000     $ 25.44