Note 3 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Restricted share units:
Pretax compensation expense	$	7,626	$	5,977	$	26,061	$	22,987
Tax benefit		1,983		2,146		6,776		7,793
Restricted share unit expense, net of tax	$	5,643	$	3,831	$	19,285	$	15,194
Performance share units:
Pretax compensation expense	$	3,557	$	1,867	$	11,123	$	7,966
Tax benefit		925		670		2,892		2,700
Performance share unit expense, net of tax	$	2,632	$	1,197	$	8,231	$	5,266