Note 3 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Restricted share units:
Pretax compensation expense	$	12,429	$	10,892	$	27,108	$	20,634
Tax benefit		3,182		2,723		6,940		5,158
Restricted share unit expense, net of tax	$	9,247	$	8,169	$	20,168	$	15,476
Performance share units:
Pretax compensation expense	$	3,573	$	3,840	$	6,957	$	7,670
Tax benefit		915		960		1,781		1,917
Performance share unit expense, net of tax	$	2,658	$	2,880	$	5,176	$	5,753