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Note 14 - Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
14.
     Quarterly Financial Information (Unaudited)
 
As further discussed in Note
10,
Commitments and Contingencies, our
fourth
quarter
2018
operating income, net earnings and earnings per share included the impact of pretax charges for contingent liabilities. As further discussed in Note
7,
Income Taxes, our
fourth
quarter
2017,
net earnings and earnings per share included the effect of a
$309.2
million provisional amount recorded as a component of income tax expense from continuing operations resulting from the remeasurement of our deferred tax balance due to the enactment of the Tax Cuts and Jobs Act. Operating results by quarter for the years ended
December 31, 2018
and
2017
are as follows (in thousands, except per share data):
 
   
Quarter
  
   
First
    
Second
    
Third
    
Fourth
  
2018:
                                
Operating revenues
   $
1,948,245
     $
2,139,027
     $
2,209,760
     $
2,317,842
  
Operating income
   $
168,781
     $
214,812
     $
174,688
     $
122,740
  
Net earnings
   $
118,142
     $
151,652
     $
131,110
     $
88,681
  
Basic earnings per share
   $
1.08
     $
1.39
     $
1.20
     $
0.81
  
Diluted earnings per share
   $
1.07
     $
1.37
     $
1.19
     $
0.81
  
                                 
2017:
                                
Operating revenues
   $
1,629,158
     $
1,726,915
     $
1,843,334
     $
1,990,160
  
Operating income
   $
149,389
     $
163,615
     $
164,972
     $
145,814
  
Net earnings
   $
102,702
     $
97,869
     $
100,385
     $
385,308
  
Basic earnings per share
   $
0.93
     $
0.89
     $
0.92
     $
3.51
  
Diluted earnings per share
   $
0.92
     $
0.88
     $
0.91
     $
3.48