Note 3 - Share-based Compensation

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

3.	Share-based Compensation

The following table summarizes the components of our share-based compensation program expense (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Restricted share units:
Pretax compensation expense	$	8,873	$	8,939	$	17,010	$	16,907
Tax benefit		3,314		3,397		5,596		6,425
Restricted share unit expense, net of tax	$	5,559	$	5,542	$	11,414	$	10,482
Performance share units:
Pretax compensation expense	$	3,067	$	3,004	$	6,100	$	6,008
Tax benefit		1,146		1,142		2,007		2,283
Performance share unit expense, net of tax	$	1,921	$	1,862	$	4,093	$	3,725

As of

June 30, 2017,

we had

$59.0

million and

$13.3

million of total unrecognized compensation expense related to restricted share units and performance share units, respectively, that is to be recognized over the remaining weighted-average period of approximately

3.8

years for restricted share units and

2.4

years for performance share units. During the

six

months ended

June 30, 2017,

we issued

14,623

shares for vested restricted share units. Of this total,

5,514

shares for vested restricted share units were issued during the

second

quarter

2017.