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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2014
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)
 
 
 
 
 
 
 
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

2013 (1)
 
 
 
 
 
 
 
Operating Revenues
$
140,729

 
$
94,146

 
$
86,545

 
$
122,887

Operating Income
$
26,550

 
$
9,152

 
$
8,720

 
$
18,312

Net Income
$
14,869

 
$
4,356

 
$
3,879

 
$
9,683

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.03

 
$
0.30

 
$
0.27

 
$
0.67

Diluted
$
1.03

 
$
0.30

 
$
0.27

 
$
0.67

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