Three months ended
June 30,

Six months ended
June 30,

(in thousands, except market price and earnings per share)

2018

2017

2018

2017

Net income attributable to the Company

$30,365

$1,117

$40,610

$11,956

Weighted average number of shares:

Weighted average number of shares used in

calculating basic net income per share

32,257

32,166

32,239

32,147

Effect of dilutive stock-based compensation plans:

Stock options

16

34

16

35

Weighted average number of shares used in

calculating diluted net income per share

32,273

32,200

32,255

32,182

Average market price of common stock used

for calculation of dilutive shares

$61.86

$48.44

$62.83

$47.47

Net income per share:

Basic

$0.94

$0.03

$1.26

$0.37

Diluted

$0.94

$0.03

$1.26

$0.37