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Change in Accounting Estimate for Self-Insured Claims | 6 Months Ended
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Jun. 29, 2019
Change in Accounting Estimate for Self-Insured Claims |
(11) | 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 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 attributable to Landstar System, Inc. and subsidiary and earnings per share attributable to Landstar System, Inc. and subsidiary set forth in the consolidated statements of income for the twenty-six-week and thirteen-week periods ended June 29, 2019 and June 30, 2018 (in thousands, except per share amounts):
|  | Twenty Six Weeks Ended |  |  | Thirteen Weeks Ended |
|  | June 29, 2019 |  |  | June 30, 2018 |  |  | June 29, 2019 |  |  | June 30, 2018 |
Operating income |  | $ | 2,900 |  |  | $ | 8,244 |  |  | $ | 1,493 |  |  | $ | 5,686 |
Net income attributable to Landstar System, Inc. and subsidiary |  |  | 2,198 |  |  |  | 6,224 |  |  |  | 1,131 |  |  |  | 4,293 |
Earnings per share attributable to Landstar System, Inc. and subsidiary |  | $ | 0.05 |  |  | $ | 0.15 |  |  | $ | 0.03 |  |  | $ | 0.10 |
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary |  | $ | 0.05 |  |  | $ | 0.15 |  |  | $ | 0.03 |  |  | $ | 0.10 |
The unfavorable development of prior years’ claims in the thirteen-week period ended June 30, 2018 was primarily attributable to three claims.

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- Definition The entire disclosure for reporting accounting changes, excludes error corrections information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -URI http://asc.fasb.org/topic&trid=2122394 + Details
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