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Note Q - Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2011
Schedule of Share-based Compensation, Shares Authorized under Stock Plans, Issued and Avaliability [Table Text Block]
Common Stock authorized
    9,144,000  
         
Stock-based awards, including restricted stock and stock options, granted net of expired or cancelled
    6,345,000  
         
Common Stock available for grant of stock-based awards as of June 30, 2011
    2,799,000  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2011
   
2010
   
2011
   
2010
 
                                 
Stock options
  $ 1,420     $ 816     $ 2,608     $ 1,346  
Restricted stock
    1,620       1,043       2,957       2,330  
                                 
Total
  $ 3,040     $ 1,859     $ 5,565     $ 3,676  
Schedule Of Cash Proceeds And Intrinsic Values For Stock Options Exercised [TableText Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2011
   
2010
   
2011
   
2010
 
                                 
Proceeds from stock options exercised
  $ 3,254     $ 1,581     $ 3,485     $ 1,913  
Intrinsic value of stock options exercised
  $ 7,510     $ 4,026     $ 7,799     $ 4,614  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used
   
Six months ended June 30,
   
2011
 
2010
         
Expected volatility
 
47.6% to 48.7%
 
47.5% to 52.4%
Risk-free interest rate
 
1.22% to 1.78%
 
1.62% to 2.16%
Expected life (in years)
 
2.8 to 4.4
 
2.8 to 4.4
Expected dividend yield
 
None
 
None
Weighted average fair value
 
$10.83
 
$8.48
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, 2011
    2,703,000     $ 14.08    
 
   
 
 
Granted
    563,000       26.10    
 
   
 
 
Exercised
    (313,000 )     11.13    
 
   
 
 
Cancelled/Forfeited
    (158,000 )     19.95          
 
 
                                 
Outstanding at June 30, 2011
     2,795,000     $ 16.50       5.0     $ 58,632  
                                 
Exercisable at June 30, 2011
     771,000     $ 12.95       4.5     $ 18,925  
Schedule of Nonvested Share Activity [Table Text Block]
   
2011
   
2010
 
   
Number of Shares
   
Weighted Average Fair Value at Grant Date
   
Number of Shares
   
Weighted Average Fair Value at Grant Date
 
                                 
Non-vested at January 1
    563,000     $ 17.20       671,000     $ 13.98  
Granted
    323,000       31.16       177,000       20.33  
Vested
    (179,000 )     14.93       (267,000 )     13.34  
Forfeited
                (5,000 )     15.13  
                                 
Non-vested at June 30
    707,000     $ 24.15       576,000     $ 18.96