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Note Q - Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
Common stock authorized     9,144,000  
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled     (8,377,000 )
         
Common stock available for grant of stock-based awards as of March 31, 2012     767,000  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Three Months Ended March 31,  
    2012     2011  
Restricted stock   $ 2,451     $ 1,337  
Stock options     1,556       1,188  
Total   $ 4,007     $ 2,525  
    Three Months Ended March 31,  
    2012     2011  
Proceeds from stock options exercised   $ 3,548     $ 232  
Intrinsic value of stock options exercised   $ 5,270     $ 289  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

 

2012

2011

Volatility 47.1% to 47.4% 47.6% to 48.7%
Risk free interest rate 0.52% to 0.87% 1.43% to 1.63%
Expected life in years 4.1 to 4.6 3.4 to 4.4
Dividend yield 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, 2012     2,702,000     $ 17.79                  
Granted     59,000       43.04                  
Exercised     (201,000 )     17.26                  
Cancelled/Forfeited     —       —                  
                                 
Outstanding at March 31, 2012     2,560,000     $ 18.41       5.0 years     $ 56,468  
                                 
Exercisable at March 31, 2012     886,000     $ 16.92       5.1 years     $ 20,804  
Schedule of Nonvested Share Activity [Table Text Block]
    2012     2011  
    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     671,000     $ 25.44       563,000     $ 17.20  
Granted     1,050,000       41.12       107,000       29.32  
Vested     (103,000 )     12.08       (71,000 )     13.26  
Forfeited     —       —       —       —  
                                 
Non-vested at March 31     1,618,000     $ 36.04       599,000     $ 19.81