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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2017
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)
 
 
 
 
 
 
 
2017 (1)
 
 
 
 
 
 
 
Operating Revenues
$
185,160

 
$
125,084

 
$
126,936

 
$
180,403

Operating Income
$
34,676

 
$
13,666

 
$
14,239

 
$
23,263

Net Income
$
19,144

 
$
6,046

 
$
6,833

 
$
26,101

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.17

 
$
0.37

 
$
0.42

 
$
1.60

Diluted
$
1.17

 
$
0.37

 
$
0.42

 
$
1.59

 
 
 
 
 
 
 
 
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

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