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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2015
Text Block [Abstract]  
Quarterly Financial Data (Unaudited)
QUARTERLY FINANCIAL DATA (UNAUDITED)
In our opinion, the quarterly financial information shown below includes all adjustments necessary for a fair presentation of the operations for such periods. 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)
 
 
 
 
 
 
 
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

2014 (1)
 
 
 
 
 
 
 
Operating Revenues
$
186,337

 
$
100,497

 
$
91,619

 
$
120,380

Operating Income
$
31,623

 
$
10,457

 
$
7,792

 
$
12,408

Net Income
$
17,681

 
$
5,134

 
$
3,180

 
$
10,097

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.22

 
$
0.35

 
$
0.22

 
$
0.69

Diluted
$
1.21

 
$
0.35

 
$
0.22

 
$
0.69

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