Note 3 - Share-based Compensation

9 Months Ended

Sep. 30, 2018

Notes to Financial Statements

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

3 . Share-b ased Compensation

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

	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

As of

September 30, 2018,

we had

$63.2

million and

$17.1

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

3.6

years for restricted share units and

2.5

years for performance share units. During the

nine

months ended

September 30, 2018,

we issued

295,186

shares for vested restricted share units,

118,438

shares for vested performance share units. Of these totals,

291,045

shares for vested restricted share units and

118,438

for performance share units were issued during the

third

quarter,

2018.