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Earnings Per Share | 12 Months Ended
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Dec. 31, 2019
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:
(in thousands, except market price and earnings per share) |  | 2019 |  | 2018 |  | 2017
Net income attributable to the Company |  | $132,398 |  | $82,891 |  | $33,111
Weighted average number of shares: |  |  |  |  |  |
Weighted average number of shares used in calculating basic net income per share |  | 32,296 |  | 32,252 |  | 32,169
Effect of dilutive stock-based compensation plans: |  |  |  |  |  |
Stock options |  | 12 |  | 15 |  | 30
Long-term incentive plan |  | 14 |  | 28 |  | 45
Weighted average number of shares used in calculating diluted net income per share |  | 32,322 |  | 32,295 |  | 32,244
Average market price of common stock used for calculation of dilutive shares |  | $78.13 |  | $66.95 |  | $52.19
Net income per share: |  |  |  |  |  |
Basic |  | $4.10 |  | $2.57 |  | $1.03
Diluted |  | $4.10 |  | $2.57 |  | $1.03
Shares outstanding, net of treasury shares, were 32.3 million as of December 31, 2019 and 2018, and were 32.2 million as of December 31, 2017.

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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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