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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share | The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share attributable to SMP (in thousands, except per share data):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Net Earnings Attributable to SMP - |  |  |  |  |  |  |  |  |
Earnings from continuing operations |  | $ | 63,144 |  |  | $ | 73,042 |  |  | $ | 99,353 |
Loss from discontinued operations |  |  | (28,996 | ) |  |  | (17,691 | ) |  |  | (8,467 | )
Net earnings attributable to SMP |  | $ | 34,148 |  |  | $ | 55,351 |  |  | $ | 90,886 |
Basic Net Earnings Per Common Share Attributable to SMP - |  |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations per common share |  | $ | 2.91 |  |  | $ | 3.37 |  |  | $ | 4.49 |
Loss from discontinued operations per common share |  |  | (1.34 | ) |  |  | (0.82 | ) |  |  | (0.39 | )
Net earnings per common share attributable to SMP |  | $ | 1.57 |  |  | $ | 2.55 |  |  | $ | 4.10 |
Weighted average common shares outstanding |  |  | 21,716 |  |  |  | 21,684 |  |  |  | 22,147 |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Diluted Net Earnings Per Common Share Attributable to SMP - |  |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations per common share |  | $ | 2.85 |  |  | $ | 3.30 |  |  | $ | 4.39 |
Loss from discontinued operations per common share |  |  | (1.31 | ) |  |  | (0.80 | ) |  |  | (0.37 | )
Net earnings per common share attributable to SMP |  | $ | 1.54 |  |  | $ | 2.50 |  |  | $ | 4.02 |
Weighted average common shares outstanding |  |  | 21,716 |  |  |  | 21,684 |  |  |  | 22,147 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of restricted stock and performance-based stock |  |  | 445 |  |  |  | 456 |  |  |  | 469 |
Weighted average common shares outstanding – Diluted |  |  | 22,161 |  |  |  | 22,140 |  |  |  | 22,616 |
Anti-dilutive Securities Excluded from Computation of Earnings per Share | The shares listed below were not included in the computation of diluted net earnings per common share attributable to SMP because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands):
|  | 2023 |  |  | 2022 |  |  | 2021 |
Restricted and performance shares |  |  | 280 |  |  |  | 292 |  |  |  | 269 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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