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Business Segment (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Summary of Information by Business Segment
 
 
 
 
Three Months Ended
 
 
 
 
September 30, 2016
 
September 30, 2015
 
 
Total Assets at
 
External
 
Income
 
External
 
Income
(Thousands of dollars)
 
September 30,
 
Revenues
 
(Loss)
 
Revenues
 
(Loss)
Marketing
 
$
1,778,818

 
$
3,042,727

 
$
52,755

 
$
3,382,500

 
$
65,785

Corporate and other assets
 
278,011

 
11

 
(7,264
)
 
7

 
(5,764
)
Total continuing operations
 
2,056,829

 
3,042,738

 
45,491

 
3,382,507

 
60,021

Discontinued operations
 
—

 
—

 
—

 
—

 
510

Total
 
$
2,056,829

 
$
3,042,738

 
$
45,491

 
$
3,382,507

 
$
60,531

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended
 
 
 
 
September 30, 2016
 
September 30, 2015
 
 
 
 
External
 
Income
 
External
 
Income
(Thousands of dollars)
 
 
 
Revenues
 
(Loss)
 
Revenues
 
(Loss)
Marketing
 
 
 
$
8,538,535

 
$
198,622

 
$
9,770,989

 
$
124,008

Corporate and other assets
 
 
 
227

 
(20,947
)
 
268

 
(15,650
)
Total operating segment
 
 
 
8,538,762

 
177,675

 
9,771,257

 
108,358

Discontinued operations
 
 
 
—

 
—

 
—

 
1,296

Total
 
 
 
$
8,538,762

 
$
177,675

 
$
9,771,257

 
$
109,654