Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule Computing Earnings Per Share

The amounts used in computing earnings per share and the weighted average number of shares of potentially dilutive securities are as follows:

	Three months ended March 31,
(in thousands, except market price and earnings per share)	2018	2017
Net income attributable to the Company	$10,245	$10,839
Weighted average number of shares:
Weighted average number of shares used in
calculating basic net income per share	32,220	32,128
Effect of dilutive stock-based compensation plans:
Stock options	16	36
Weighted average number of shares used in
calculating diluted net income per share	32,236	32,164
Average market price of common stock used
for calculation of dilutive shares	$63.86	$46.69
Net income per share:
Basic	$0.32	$0.34
Diluted	$0.32	$0.34