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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Summary of Information by Business Segment
Segment Information
 
 
 
Corporate and
 
Discontinued
 
 
(Thousands of dollars)
 
Marketing
 
Other Assets
 
Operations
 
Consolidated
Year ended December 31, 2015
 
 
 
 
 
 
 
 
Segment income (loss)
 
$
159,796

 
(22,205
)
 
38,749

 
$
176,340

Revenues from external customers
 
12,699,125

 
286

 
—

 
12,699,411

Interest income
 
—

 
2,177

 
—

 
2,177

Interest expense
 
(20
)
 
(33,511
)
 
—

 
(33,531
)
Income tax expense (benefit)
 
95,657

 
(14,959
)
 
—

 
80,698

Significant noncash charges (credits)
 
 

 
 

 
 

 


Depreciation and amortization
 
81,349

 
5,219

 
—

 
86,568

Accretion of asset retirement obligations
 
1,521

 
—

 
—

 
1,521

Deferred and noncurrent income taxes (benefits)
 
42,593

 
(2,037
)
 
—

 
40,556

Additions to property, plant and equipment
 
202,371

 
9,477

 
3,720

 
215,568

Total assets at year-end
 
$
1,727,131

 
159,110

 
—

 
$
1,886,241

Segment Information
 
 
Corporate and
 
Discontinued
 
 
(Thousands of dollars)
Marketing
 
Other Assets
 
Operations
 
Consolidated
Year ended December 31, 2014
 

 
 

 
 

 
 

Segment income (loss)
$
242,434

 
(19,474
)
 
20,903

 
$
243,863

Revenues from external customers
16,985,903

 
111

 
—

 
16,986,014

Interest income
—

 
244

 
—

 
244

Interest expense
—

 
(36,646
)
 
—

 
(36,646
)
Income tax expense (benefit)
127,657

 
(11,271
)
 
—

 
116,386

Significant noncash charges (credits)
 

 
 

 
 

 
 
Depreciation and amortization
74,906

 
4,181

 
—

 
79,087

Accretion of asset retirement obligations
1,200

 
—

 
—

 
1,200

Deferred and noncurrent income taxes (benefits)
368

 
(4,771
)
 
—

 
(4,403
)
Additions to property, plant and equipment
131,139

 
4,200

 
3,549

 
138,888

Total assets at year-end
$
1,544,018

 
348,991

 
56,328

 
$
1,949,337

 
 
 
 
 
 
 
 
Year ended December 31, 2013
 

 
 

 
 

 
 

Segment income (loss)
$
164,013

 
(9,878
)
 
80,898

 
$
235,033

Revenues from external customers
17,814,081

 
—

 
—

 
17,814,081

Interest income
—

 
1,099

 
—

 
1,099

Interest expense
—

 
(14,509
)
 
—

 
(14,509
)
Income tax expense (benefit)
106,223

 
(6,164
)
 
—

 
100,059

Significant noncash charges (credits)
 

 
 

 
 

 
 
Depreciation and amortization
71,253

 
2,800

 
—

 
74,053

Accretion of asset retirement obligations
1,096

 
—

 
—

 
1,096

Deferred and noncurrent income taxes (benefits)
(9,796
)
 
(1,772
)
 
—

 
(11,568
)
Additions to property, plant and equipment
162,051

 
8,169

 
1,752

 
171,972

Total assets at year-end
$
1,527,125

 
320,281

 
41,158

 
$
1,888,564