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Earnings Per Share | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share |
9. | EARNINGS PER SHARE
Below are the computations of basic and diluted earnings per share for the three and nine months ended September 30, 2017 and 2016:
(In thousands, except per share amounts) |  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 21,899 |  |  | $ | 21,362 |  |  | $ | 81,694 |  |  | $ | 77,774 |
Weighted-average number of common shares outstanding |  |  | 22,971 |  |  |  | 22,819 |  |  |  | 22,941 |  |  |  | 22,771 |
Basic earnings per share |  | $ | 0.95 |  |  | $ | 0.94 |  |  | $ | 3.56 |  |  | $ | 3.42 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 21,899 |  |  | $ | 21,362 |  |  | $ | 81,694 |  |  | $ | 77,774 |
Weighted-average number of shares outstanding |  |  | 22,971 |  |  |  | 22,819 |  |  |  | 22,941 |  |  |  | 22,771 |
Add weighted-average net shares issuable from assumed exercise of options (under treasury stock method) (1) |  |  | 147 |  |  |  | 162 |  |  |  | 167 |  |  |  | 151 |
Add weighted-average net shares related to unvested stock awards (under treasury stock method) |  |  | 8 |  |  |  | 7 |  |  |  | 8 |  |  |  | 6 |
Add weighted-average net shares from assumed exercise of SARs (under treasury stock method) (1) |  |  | 140 |  |  |  | 93 |  |  |  | 142 |  |  |  | 45 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury stock method) |  |  | 108 |  |  |  | 67 |  |  |  | 103 |  |  |  | 44 |
Weighted-average shares applicable to diluted earnings |  |  | 23,374 |  |  |  | 23,148 |  |  |  | 23,361 |  |  |  | 23,017 |
Diluted earnings per share |  | $ | 0.94 |  |  | $ | 0.92 |  |  | $ | 3.50 |  |  | $ | 3.38 |
| (1) | Options/SARs to acquire 24,840 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2017. Options/SARs to acquire 58,287 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2016. Inclusion of the instruments would have had antidilutive effects on the computations of earnings per share. |

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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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