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QUARTERLY FINANCIAL DATA (UNAUDITED) (Notes)
 12 Months Ended
Dec. 31, 2019
Schedule of Quarterly Financial Information [Line Items]  
QUARTERLY FINANCIAL DATA (UNAUDITED)
QUARTERLY FINANCIAL DATA (UNAUDITED)

 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year Ended December 31, 2019
 
 
 
 
 
 
(Thousands of dollars)
Revenues
 
$
661,000

 
$
290,560

 
$
248,563

 
$
452,607

Operating income
 
$
127,619

 
$
46,891

 
$
38,777

 
$
81,971

Net income
 
$
93,660

 
$
24,470

 
$
17,457

 
$
51,162

Earnings per share
 
 
 
 
 
 
 
 
   Basic
 
$
1.77

 
$
0.46

 
$
0.33

 
$
0.97

   Diluted
 
$
1.76

 
$
0.46

 
$
0.33

 
$
0.96

 
 
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.