Note 3 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Restricted share units:
Pretax compensation expense	$	11,250	$	10,309	$	38,358	$	30,942
Tax benefit		2,880		2,660		9,820		7,983
Restricted share unit expense, net of tax	$	8,370	$	7,649	$	28,538	$	22,959
Performance share units:
Pretax compensation expense	$	3,344	$	3,541	$	10,300	$	11,212
Tax benefit		856		914		2,637		2,893
Performance share unit expense, net of tax	$	2,488	$	2,627	$	7,663	$	8,319