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Change in Accounting Estimate for Self-Insured Claims (Tables)
 6 Months Ended
Jun. 27, 2020
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 27, 2020 and June 29, 2019 (in thousands, except per share amounts):
 
 
  
Twenty Six Weeks Ended
 
  
Thirteen Weeks Ended
 
 
  
June 27,

2020
 
  
June 29,

2019
 
  
June 27,

2020
 
  
June 29,

2019
 
Operating income
  
$
 5,039
 
  
$
 2,900
 
  
$
 2,816
 
  
$
 1,493
 
Net income attributable to Landstar System, Inc. and subsidiary
  
$
 3,820
 
  
$
 2,198
 
  
$
 2,135
 
  
$
 1,131
 
Earnings per share attributable to Landstar System, Inc. and subsidiary
  
$
0.10
 
  
$
0.05
 
  
$
0.06
 
  
$
0.03
 
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary
  
$
0.10
 
  
$
0.05
 
  
$
0.06
 
  
$
0.03