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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
(21)           Quarterly Financial Data (Unaudited)

Our quarterly financial information has not been audited, but, in management's opinion, includes all adjustments necessary for a fair presentation. Our business is seasonal in nature with the peak sales periods generally occurring during the summer and winter months. Accordingly, comparisons among quarters of a year may not represent overall trends and changes in operations. Amounts presented are in thousands, except per share data:
2016
 
First
 
Second
 
Third
 
Fourth
Operating revenues
 
$
332,539

 
$
293,120

 
$
300,998

 
$
330,590

Operating income
 
61,933

 
63,742

 
56,116

 
64,156

Net income (1)
 
$
39,867

 
$
35,569

 
$
44,605

 
$
44,131

Average common shares outstanding
 
48,242

 
48,309

 
48,315

 
48,329

Income per average common share:
 
 
 
 
 
 
 
 
Basic
 
$
0.83

 
$
0.74

 
$
0.92

 
$
0.91

Diluted
 
$
0.82

 
$
0.73

 
$
0.92

 
$
0.92

Dividends per share
 
$
0.50

 
$
0.50

 
$
0.50

 
$
0.50

Stock price:
 
 
 
 
 
 
 
 
High
 
$
62.22

 
$
63.30

 
$
63.75

 
$
59.13

Low
 
52.16

 
55.34

 
56.18

 
53.85

Quarter-end close
 
61.75

 
63.07

 
57.53

 
56.87

 _____________________

(1)         We adopted the provisions of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, during the fourth quarter of 2016, which resulted in the recognition of $1.8 million in excess tax benefits. In accordance with the guidance, the $1.8 million impact of this adoption is reflected as of January 1, 2016, which resulted in an increase in net income and earnings per share for the three months ended March 31, 2016 above.

2015
 
First
 
Second
 
Third
 
Fourth
Operating revenues
 
$
346,011

 
$
270,560

 
$
272,739

 
$
324,989

Operating income
 
83,891

 
61,132

 
48,461

 
72,332

Net income
 
$
51,425

 
$
30,973

 
$
23,798

 
$
45,013

Average common shares outstanding
 
46,977

 
47,044

 
47,065

 
48,098

Income per average common share:
 
 
 
 
 
 
 
 
Basic
 
$
1.09

 
$
0.66

 
$
0.51

 
$
0.94

Diluted
 
$
1.09

 
$
0.65

 
$
0.51

 
$
0.92

Dividends per share
 
$
0.48

 
$
0.48

 
$
0.48

 
$
0.48

Stock price:
 
 
 
 
 
 
 
 
High
 
$
59.71

 
$
54.65

 
$
56.68

 
$
57.07

Low
 
50.75

 
48.44

 
48.47

 
51.27

Quarter-end close
 
53.79

 
48.75

 
53.83

 
54.25