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Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | 18. Earnings Per Share Below is the computation of basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016.
(In thousands, except per share amounts) |  | 2018 |  |  | 2017 |  |  | 2016 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 112,762 |  |  | $ | 91,578 |  |  | $ | 86,191 |
Weighted-average number of shares outstanding |  |  | 23,022 |  |  |  | 22,946 |  |  |  | 22,793 |
Basic earnings per share |  | $ | 4.90 |  |  | $ | 3.99 |  |  | $ | 3.78 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 112,762 |  |  | $ | 91,578 |  |  | $ | 86,191 |
Weighted-average number of shares outstanding |  |  | 23,022 |  |  |  | 22,946 |  |  |  | 22,793 |
Add weighted-average net shares from assumed exercise of options (under treasury share method) (a) |  |  | 101 |  |  |  | 161 |  |  |  | 159 |
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  | 3 |  |  |  | 8 |  |  |  | 6 |
Add weighted-average net shares from assumed exercise of SARs (under treasury share method) |  |  | 110 |  |  |  | 142 |  |  |  | 68 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury share method) |  |  | 89 |  |  |  | 120 |  |  |  | 68 |
Weighted-average shares applicable to diluted earnings |  |  | 23,325 |  |  |  | 23,377 |  |  |  | 23,094 |
Diluted earnings per share |  | $ | 4.83 |  |  | $ | 3.92 |  |  | $ | 3.73 |
| (a) | Options/SARs to purchase 50,770, 18,630 and 43,715 shares of common stock were not included in the computations of diluted earnings per share for the years ended December 31, 2018, 2017 and 2016, respectively. The options’/SARs’ exercise prices were greater than the average market price for the common stock and the effect of the options/SARs on earnings per share would have been antidilutive.

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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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