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Earnings Per Share | 9 Months Ended
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Sep. 30, 2017
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 September 30, | Nine months ended September 30,
(in thousands, except market price and earnings per share) | 2017 | 2016 | 2017 | 2016
Net income attributable to the Company | $15,269 |  | $13,069 |  | $27,225 |  | $36,937 |
Weighted average number of shares: |  |  |  |  |  |  |  |
Weighted average number of shares used in |  |  |  |  |  |  |  |
calculating basic net income per share | 32,187 |  | 32,104 |  | 32,160 |  | 32,079 |
Effect of dilutive stock-based compensation plans: |  |  |  |  |  |  |  |
Stock options | 27 |  | 37 |  | 33 |  | 39 |
Weighted average number of shares used in |  |  |  |  |  |  |  |
calculating diluted net income per share | 32,214 |  | 32,141 |  | 32,193 |  | 32,118 |
Average market price of common stock used |  |  |  |  |  |  |  |
for calculation of dilutive shares | $53.49 |  | $42.03 |  | $49.49 |  | $38.97 |
Net income per share: |  |  |  |  |  |  |  |
Basic | $0.47 |  | $0.41 |  | $0.85 |  | $1.15 |
Diluted | $0.47 |  | $0.41 |  | $0.85 |  | $1.15 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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