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Change in Accounting Estimate for Self-Insured Claims | 12 Months Ended
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Dec. 31, 2022
Change in Accounting Estimate for Self-Insured Claims | (14) Change in Accounting Estimate for Self-Insured Claims Landstar provides for the estimated costs of self-insured claims primarily on an actuarial basis. The amount recorded for the estimated liability for claims incurred is based upon the facts and circumstances known on the applicable balance sheet date. The ultimate resolution of these claims may be for an amount greater or less than the amount estimated by management. The Company continually revises its existing claim estimates as new or revised information becomes available on the status of each claim. Historically, the Company has experienced both favorable and unfavorable development of prior years’ claims estimates. The following table summarizes the adverse effect of the increase in the cost of insurance claims resulting from unfavorable development of prior year self-insured claims estimates on operating income, net income and earnings per share set forth in the consolidated statements of income for the fiscal years ended December 31, 2022, December 25, 2021 and December 26, 2020 (in thousands, except per share amounts):
|  | Fiscal Years Ended |
|  | December 31, 2022 |  |  | December 25, 2021 |  |  | December 26, 2020 |
Operating income |  | $ | 11,331 |  |  | $ | 9,708 |  |  | $ | 9,196 |
Net income |  | $ | 8,570 |  |  | $ | 7,359 |  |  | $ | 6,989 |
Diluted earnings per share |  | $ | 0.23 |  |  | $ | 0.19 |  |  | $ | 0.18 |
The unfavorable development of prior years’ claims in the fiscal year ended December 31, 2022 was primarily attributable to several specific claims. The unfavorable development of prior years’ claims in the fiscal year ended December 25, 2021 was primarily attributable to five claims. The unfavorable development of prior years’ claims in the fiscal year ended December 26, 2020 was attributable to several specific claims as well as actuarially determined adjustments to prior year commercial trucking loss estimates.

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- Definition The entire disclosure for reporting change in accounting estimate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794 + Details
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