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Change in Accounting Estimate for Self-Insured Claims | 12 Months Ended
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Dec. 29, 2018
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 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 fiscal years ended December 29, 2018, December 30, 2017 and December 31, 2016 (in thousands, except per share amounts):
|  | Fiscal Years Ended |
|  | December 29, 2018 |  |  | December 30, 2017 |  |  | December 31, 2016 |
Operating income |  | $ | 13,960 |  |  | $ | 4,144 |  |  | $ | 1,079 |
Net income attributable to Landstar System, Inc. and subsidiary |  | $ | 10,582 |  |  | $ | 2,578 |  |  | $ | 667 |
Earnings per share attributable to Landstar System, Inc. and subsidiary |  | $ | 0.26 |  |  | $ | 0.06 |  |  | $ | 0.02 |
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary |  | $ | 0.26 |  |  | $ | 0.06 |  |  | $ | 0.02 |
The unfavorable development of prior year’s claims in the fiscal year ended December 29, 2018 was primarily attributable to five 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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