Note 3 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Restricted share units:
Pretax compensation expense	$	8,939	$	8,053	$	16,907	$	15,704
Tax benefit		3,397		3,068		6,425		5,983
Restricted share unit expense, net of tax	$	5,542	$	4,985	$	10,482	$	9,721
Performance share units:
Pretax compensation expense	$	3,004	$	2,515	$	6,008	$	4,993
Tax benefit		1,142		958		2,283		1,902
Performance share unit expense, net of tax	$	1,862	$	1,557	$	3,725	$	3,091