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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2016
Text Block [Abstract]  
Schedule of Quarterly Financial Information
Due to the seasonal nature of our business, there are substantial variations in operations reported on a quarterly basis.
 
For the Quarters Ended
 
March 31
 
June 30
 
September 30
 
December 31
(in thousands except per share amounts)
 
 
 
 
 
 
 
2016 (1)
 
 
 
 
 
 
 
Operating Revenues
$
146,296

 
$
102,342

 
$
108,348

 
141,874

Operating Income
$
36,380

 
$
15,742

 
$
10,156

 
$
21,819

Net Income
$
20,367

 
$
8,029

 
$
4,416

 
$
11,863

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.33

 
$
0.52

 
$
0.29

 
$
0.73

Diluted
$
1.33

 
$
0.52

 
$
0.29

 
$
0.73

 
 
 
 
 
 
 
 
2015 (1)
 
 
 
 
 
 
 
Operating Revenues
$
170,081

 
$
92,682

 
$
91,913

 
104,567

Operating Income
$
37,508

 
$
13,170

 
$
10,909

 
$
16,171

Net Income
$
21,109

 
$
6,294

 
$
5,119

 
$
8,619

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.45

 
$
0.41

 
$
0.34

 
$
0.56

Diluted
$
1.44

 
$
0.41

 
$
0.33

 
$
0.56

(1)
The sum of the four quarters does not equal the total year due to rounding.