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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | Below are the computations of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018:
(In thousands, except per share amounts) |  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2019 |  |  | 2018 As Adjusted |  |  | 2019 |  |  | 2018 As Adjusted |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company (1) |  | $ | 25,889 |  |  | $ | 21,754 |  |  | $ | 81,091 |  |  | $ | 87,160 |
Weighted-average number of common shares outstanding |  |  | 23,025 |  |  |  | 22,986 |  |  |  | 23,070 |  |  |  | 23,036 |
Basic earnings per share (1) |  | $ | 1.12 |  |  | $ | 0.95 |  |  | $ | 3.52 |  |  | $ | 3.78 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company (1) |  | $ | 25,889 |  |  | $ | 21,754 |  |  | $ | 81,091 |  |  | $ | 87,160 |
Weighted-average number of shares outstanding |  |  | 23,025 |  |  |  | 22,986 |  |  |  | 23,070 |  |  |  | 23,036 |
Add weighted-average net shares from assumed exercise of options (under treasury stock method) (2) |  |  | 102 |  |  |  | 103 |  |  |  | 95 |  |  |  | 103 |
Add weighted-average net shares related to unvested stock awards (under treasury stock method) |  |  | 1 |  |  |  | 3 |  |  |  | 2 |  |  |  | 2 |
Add weighted-average net shares from assumed exercise of SARs (under treasury stock method) (2) |  |  | 135 |  |  |  | 113 |  |  |  | 120 |  |  |  | 111 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury stock method) |  |  | 37 |  |  |  | 83 |  |  |  | 33 |  |  |  | 72 |
Weighted-average shares applicable to diluted earnings |  |  | 23,300 |  |  |  | 23,288 |  |  |  | 23,320 |  |  |  | 23,324 |
Diluted earnings per share (1) |  | $ | 1.11 |  |  | $ | 0.93 |  |  | $ | 3.48 |  |  | $ | 3.74 |
| (1) | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO. |
(2) Options/SARs to acquire 142,833 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2019. Options/SARs to acquire 65,919 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2018. Inclusion of the instruments would have had antidilutive effects 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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