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Change in Accounting Estimate for Self-Insured Claims (Tables)
9 Months Ended
Sep. 28, 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 thirty-nine-week and thirteen-week periods ended September 28, 2019 and September 29, 2018 (in thousands, except per share amounts):
                                 
 
Thirty Nine Weeks Ended
   
Thirteen Weeks Ended
 
 
September 28,
2019
 
 
September 29,
2018
 
 
September 28,
2019
 
 
September 29,
2018
 
Operating income
  $
9,497
    $
11,596
    $
6,597
    $
3,352
 
Net income attributable to Landstar System, Inc. and subsidiary
   
7,199
     
8,755
     
5,001
     
2,531
 
Earnings per share attributable to Landstar System, Inc. and subsidiary
  $
0.18
    $
0.21
    $
0.13
    $
0.06
 
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary
  $
0.18
    $
0.21
    $
0.13
    $
0.06