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Note 3 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2021

   

2020

   

2021

   

2020

 

Restricted share units:

 

Pretax compensation expense

  $ 12,214     $ 12,429     $ 22,993     $ 27,108  

Tax benefit

    3,078       3,182       5,795       6,940  

Restricted share unit expense, net of tax

  $ 9,136     $ 9,247     $ 17,198     $ 20,168  

Performance share units:

 

Pretax compensation expense

  $ 4,284     $ 3,573     $ 8,473     $ 6,957  

Tax benefit

    1,080       915       2,135       1,781  

Performance share unit expense, net of tax

  $ 3,204     $ 2,658     $ 6,338     $ 5,176