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Quarterly Data (Tables)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial data
The following unaudited information shows selected items by quarter for the years 2020 and 2019:
 
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
 (In thousands, except per share amounts)
2020
    
Operating revenues$1,197,373 $1,362,928 $1,587,289 $1,385,160 
Operating expenses1,140,303 1,224,674 1,383,578 1,239,270 
Operating income57,070 138,254 203,711 145,890 
Income from continuing operations25,539 99,842 153,015 112,131 
Income (loss) from discontinued operations, net of tax
(409)(139)63 163 
Net income 25,130 99,703 153,078 112,294 
Earnings per share - basic:   
Income from continuing operations.13 .50 .76 .56 
Discontinued operations, net of tax    
Earnings per share - basic.13 .50 .76 .56 
Earnings per share - diluted:   
Income from continuing operations.13 .50 .76 .56 
Discontinued operations, net of tax    
Earnings per share - diluted.13 .50 .76 .56 
Weighted average common shares outstanding:   
Basic200,440 200,522 200,522 200,522 
Diluted200,456 200,539 200,619 200,923 
2019
    
Operating revenues$1,091,191 $1,303,573 $1,563,799 $1,378,213 
Operating expenses1,026,973 1,206,262 1,374,329 1,247,992 
Operating income64,218 97,311 189,470 130,221 
Income from continuing operations41,089 63,145 136,128 94,804 
Income (loss) from discontinued operations, net of tax
(163)(1,320)1,509 261 
Net income40,926 61,825 137,637 95,065 
Earnings per share - basic:    
Income from continuing operations.21 .32 .68 .47 
Discontinued operations, net of tax— (.01).01 — 
Earnings per share - basic.21 .31 .69 .47 
Earnings per share - diluted:    
Income from continuing operations.21 .32 .68 .47 
Discontinued operations, net of tax— (.01).01 — 
Earnings per share - diluted.21 .31 .69 .47 
Weighted average common shares outstanding:    
Basic196,401 198,270 199,343 200,383 
Diluted196,414 198,287 199,383 200,478