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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Amounts presented are in thousands, except per share data:
2018
 
First
 
Second
 
Third
 
Fourth
Operating revenues
 
$
341,502

 
$
261,817

 
$
279,874

 
$
308,816

Operating income
 
84,512

 
69,210

 
47,808

 
64,742

Net income
 
$
58,499

 
$
43,787

 
$
28,182

 
$
66,492

Average common shares outstanding
 
49,416

 
49,869

 
50,318

 
50,321

Income per average common share:
 
 
 
 
 
 
 
 
Basic
 
$
1.18

 
$
0.88

 
$
0.56

 
$
1.32

Diluted
 
$
1.18

 
$
0.87

 
$
0.56

 
$
1.31



2017
 
First
 
Second
 
Third
 
Fourth
Operating revenues
 
$
367,312

 
$
283,859

 
$
309,933

 
$
344,548

Operating income (1)
 
87,772

 
46,282

 
64,120

 
73,575

Net income
 
$
56,567

 
$
21,830

 
$
36,412

 
$
47,894

Average common shares outstanding
 
48,386

 
48,451

 
48,487

 
48,902

Income per average common share:
 
 
 
 
 
 
 
 
Basic
 
$
1.17

 
$
0.45

 
$
0.75

 
$
0.98

Diluted
 
$
1.17

 
$
0.44

 
$
0.75

 
$
0.98


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(1)   We adopted ASU 2017-07 on January 1, 2018. As a result, we reclassified the non-service cost component of net periodic benefit cost from operating, general and administrative expenses to other income (expense), net. This resulted in a $2.6 million increase in operating income during each quarter of 2017.