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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | Below is the computation of basic and diluted earnings per share for the years ended December 31, 2022, 2021 and 2020:
(In thousands, except per share amounts) |  | 2022 |  |  | 2021 |  |  | 2020 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 147,153 |  |  | $ | 137,804 |  |  | $ | 126,770 |
Weighted-average number of shares outstanding |  |  | 22,781 |  |  |  | 22,922 |  |  |  | 22,949 |
Basic earnings per share |  | $ | 6.46 |  |  | $ | 6.01 |  |  | $ | 5.52 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 147,153 |  |  | $ | 137,804 |  |  | $ | 126,770 |
Weighted-average number of shares outstanding |  |  | 22,781 |  |  |  | 22,922 |  |  |  | 22,949 |
Add weighted-average net shares from assumed exercise of options (under treasury share method) (1) |  |  | 104 |  |  |  | 138 |  |  |  | 112 |
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
Add weighted-average net shares from assumed exercise of SARs (under treasury share method) |  |  | 111 |  |  |  | 166 |  |  |  | 145 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury share method) |  |  | 67 |  |  |  | 60 |  |  |  | 49 |
Weighted-average shares applicable to diluted earnings |  |  | 23,064 |  |  |  | 23,287 |  |  |  | 23,256 |
Diluted earnings per share |  | $ | 6.38 |  |  | $ | 5.92 |  |  | $ | 5.45 |
(1) Options/SARs to purchase 343,715, 103,182 and 127,434 shares of the Company’s common stock were excluded from the computations of diluted earnings per share for the years ended December 31, 2022, 2021 and 2020, respectively. The options’/SARs’ exercise prices were greater than the average market price for the Company’s common stock and inclusion of the instruments would have had an antidilutive effect on the computations of earnings per share.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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