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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2018
Schedule of Quarterly Financial Information [Line Items]  
Quarterly Financial Data
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year Ended December 31, 2018
 
 
 
 
 
 
(Thousands of dollars)
Revenues
 
$
638,464

 
$
292,521

 
$
238,280

 
$
464,466

Operating income (a)
 
$
130,290

 
$
41,043

 
$
36,241

 
$
80,855

Net income
 
$
90,835

 
$
20,419

 
$
16,276

 
$
44,704

Earnings per share
 
 
 
 
 
 
 
 
   Basic
 
$
1.73

 
$
0.39

 
$
0.31

 
$
0.85

   Diluted
 
$
1.72

 
$
0.39

 
$
0.31

 
$
0.84

(a) Reflects the impact of the adoption of a new accounting standard in fiscal year 2018 related to the presentation of net periodic benefit costs. See Note 1 for additional information regarding our adoption of this standard.

 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year Ended December 31, 2017
 
 
 
 
 
 
(Thousands of dollars)
Revenues
 
$
550,408

 
$
279,689

 
$
247,142

 
$
462,394

Operating income (a)
 
$
129,445

 
$
48,365

 
$
45,093

 
$
93,825

Net income
 
$
76,456

 
$
20,623

 
$
18,797

 
$
47,119

Earnings per share
 
 
 
 
 
 
 
 
   Basic
 
$
1.45

 
$
0.39

 
$
0.36

 
$
0.90

   Diluted
 
$
1.44

 
$
0.39

 
$
0.36

 
$
0.89

(a) Reflects the impact of the adoption of a new accounting standard in fiscal year 2018 related to the presentation of net periodic benefit costs. See Note 1 for additional information regarding our adoption of this standard.