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Quarterly Results of Operations
12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
(In thousands, except per share amounts)
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
2017:
 
 
 
 
 
 
 
Operating revenues
$
501,221

 
$
519,508

 
$
528,643

 
$
567,365

Operating income
25,972

 
36,913

 
35,874

 
45,061

Net income
16,019

 
23,219

 
22,517

 
141,134

Basic earnings per share
0.22

 
0.32

 
0.31

 
1.95

Diluted earnings per share
0.22

 
0.32

 
0.31

 
1.94

 
(In thousands, except per share amounts)
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
2016:
 
 
 
 
 
 
 
Operating revenues
$
482,802

 
$
498,681

 
$
508,676

 
$
518,832

Operating income
32,487

 
29,553

 
29,074

 
34,956

Net income
20,092

 
18,306

 
18,920

 
21,811

Basic earnings per share
0.28

 
0.25

 
0.26

 
0.30

Diluted earnings per share
0.28

 
0.25

 
0.26

 
0.30