Note 3 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Restricted share units:
Pretax compensation expense	$	10,892	$	9,844	$	20,634	$	18,435
Tax benefit		2,723		2,559		5,158		4,793
Restricted share unit expense, net of tax	$	8,169	$	7,285	$	15,476	$	13,642
Performance share units:
Pretax compensation expense	$	3,840	$	4,121	$	7,670	$	7,566
Tax benefit		960		1,071		1,917		1,967
Performance share unit expense, net of tax	$	2,880	$	3,050	$	5,753	$	5,599