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Business Segment (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Summary of Information by Business Segment
 
 
 
 
Three Months Ended
 
 
 
 
June 30, 2016
 
June 30, 2015
 
 
Total Assets at
 
External
 
Income
 
External
 
Income
(Thousands of dollars)
 
June 30,
 
Revenues
 
(Loss)
 
Revenues
 
(Loss)
Marketing
 
$
1,791,859

 
$
3,005,750

 
$
53,442

 
$
3,467,985

 
$
33,468

Corporate and other assets
 
291,987

 
12

 
(7,132
)
 
1

 
(8,648
)
Total continuing operations
 
2,083,846

 
3,005,762

 
46,310

 
3,467,986

 
24,820

Discontinued operations
 
—

 
—

 
—

 
—

 
1,371

Total
 
$
2,083,846

 
$
3,005,762

 
$
46,310

 
$
3,467,986

 
$
26,191

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended
 
 
 
 
June 30, 2016
 
June 30, 2015
 
 
 
 
External
 
Income
 
External
 
Income
(Thousands of dollars)
 
 
 
Revenues
 
(Loss)
 
Revenues
 
(Loss)
Marketing
 
 
 
$
5,495,808

 
$
145,867

 
$
6,388,489

 
$
58,223

Corporate and other assets
 
 
 
216

 
(13,683
)
 
261

 
(9,886
)
Total operating segment
 
 
 
5,496,024

 
132,184

 
6,388,750

 
48,337

Discontinued operations
 
 
 
—

 
—

 
—

 
786

Total
 
 
 
$
5,496,024

 
$
132,184

 
$
6,388,750

 
$
49,123