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Quarterly Financial Data
 12 Months Ended
Dec. 31, 2018
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)
 
 
 
 
 
 
 
2018 (1)
 
 
 
 
 
 
 
Operating Revenues
$
239,356

 
$
136,664

 
$
140,279

 
$
201,190

Operating Income
$
40,406

 
$
13,248

 
$
12,036

 
$
28,930

Net Income
$
26,855

 
$
6,387

 
$
5,538

 
$
17,801

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.64

 
$
0.39

 
$
0.34

 
$
1.09

Diluted
$
1.64

 
$
0.39

 
$
0.34

 
$
1.08

 
 
 
 
 
 
 
 
2017 (1)
 
 
 
 
 
 
 
Operating Revenues
$
185,160

 
$
125,084

 
$
126,936

 
$
180,403

Operating Income
$
35,099

 
$
14,061

 
$
14,632

 
$
23,628

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

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