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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
12 Months Ended
Dec. 31, 2016
Schedule of Quarterly Financial Information [Line Items]  
Quarterly Financial Data
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year Ended December 31, 2016
 
 
 
 
 
 
(Thousands of dollars)
Revenues
 
$
508,364

 
$
245,923

 
$
232,191

 
$
440,754

Operating income
 
$
116,073

 
$
43,621

 
$
30,892

 
$
78,534

Net income
 
$
64,743

 
$
20,300

 
$
12,737

 
$
42,315

Earnings per share
 
 
 
 
 
 
 
 
   Basic
 
$
1.23

 
$
0.39

 
$
0.24

 
$
0.81

   Diluted
 
$
1.22

 
$
0.38

 
$
0.24

 
$
0.80

 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year Ended December 31, 2015
 
 
 
 
 
 
(Thousands of dollars)
Revenues
 
$
676,531

 
$
256,786

 
$
225,226

 
$
389,149

Operating income
 
$
109,005

 
$
31,270

 
$
24,951

 
$
73,903

Net income
 
$
60,381

 
$
12,076

 
$
7,371

 
$
39,202

Earnings per share
 
 
 
 
 
 
 
 
   Basic
 
$
1.15

 
$
0.23

 
$
0.14

 
$
0.75

   Diluted
 
$
1.13

 
$
0.23

 
$
0.14

 
$
0.74