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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015.
(In thousands, except per share amounts) |  | 2017 |  |  | 2016 |  |  | 2015 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 91,578 |  |  | $ | 86,191 |  |  | $ | 75,968 |
Weighted-average number of shares outstanding |  |  | 22,946 |  |  |  | 22,793 |  |  |  | 22,730 |
Basic earnings per share |  | $ | 3.99 |  |  | $ | 3.78 |  |  | $ | 3.34 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 91,578 |  |  | $ | 86,191 |  |  | $ | 75,968 |
Weighted-average number of shares outstanding |  |  | 22,946 |  |  |  | 22,793 |  |  |  | 22,730 |
Add weighted-average net shares from assumed exercise of options (under treasury share method) (a) |  |  | 161 |  |  |  | 159 |  |  |  | 118 |
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  | 8 |  |  |  | 6 |  |  |  | 3 |
Add weighted-average net shares from assumed exercise of SARs (under treasury share method) |  |  | 142 |  |  |  | 68 |  |  |  | 1 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury share method) |  |  | 120 |  |  |  | 68 |  |  |  | 6 |
Weighted-average shares applicable to diluted earnings |  |  | 23,377 |  |  |  | 23,094 |  |  |  | 22,858 |
Diluted earnings per share |  | $ | 3.92 |  |  | $ | 3.73 |  |  | $ | 3.32 |
| (a) | Options to purchase 18,630, 43,715 and 124,531 shares of common stock were not included in the computations of diluted earnings per share for the years ended December 31, 2017, 2016 and 2015, respectively. The options’ exercise prices were greater than the average market price for the common stock and the effect of the options on earnings per share would have been antidilutive.

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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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