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Change in Accounting Estimate for Self-Insured Claims (Tables)
 6 Months Ended
Jun. 29, 2019
Effect of Increase in Cost of Insurance and Claims
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