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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021, 2020 and 2019:
(In thousands, except per share amounts) |  | 2021 |  |  | 2020 |  |  | 2019 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 137,804 |  |  | $ | 126,770 |  |  | $ | 103,129 |
Weighted-average number of shares outstanding |  |  | 22,922 |  |  |  | 22,949 |  |  |  | 23,054 |
Basic earnings per share |  | $ | 6.01 |  |  | $ | 5.52 |  |  | $ | 4.47 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 137,804 |  |  | $ | 126,770 |  |  | $ | 103,129 |
Weighted-average number of shares outstanding |  |  | 22,922 |  |  |  | 22,949 |  |  |  | 23,054 |
Add weighted-average net shares from assumed exercise of options (under treasury share method) (1) |  |  | 138 |  |  |  | 112 |  |  |  | 97 |
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  | 1 |  |  |  | 1 |  |  |  | 2 |
Add weighted-average net shares from assumed exercise of SARs (under treasury share method) |  |  | 166 |  |  |  | 145 |  |  |  | 125 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury share method) |  |  | 60 |  |  |  | 49 |  |  |  | 38 |
Weighted-average shares applicable to diluted earnings |  |  | 23,287 |  |  |  | 23,256 |  |  |  | 23,316 |
Diluted earnings per share |  | $ | 5.92 |  |  | $ | 5.45 |  |  | $ | 4.42 |
| (1) | Options/SARs to purchase 103,182, 127,434 and 107,125 shares of common stock were excluded from the computations of diluted earnings per share for the years ended December 31, 2021, 2020 and 2019, respectively. The options’/SARs’ exercise prices were greater than the average market price for the common stock and inclusion of the instruments would have had an antidilutive effect on the computations of the 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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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