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Earnings Per Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | 8. 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 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

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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