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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Information concerning business activities
Information concerning our various business activities was follows for the periods indicated (in thousands):
 
Reporting Segments
 
 
 
Marketing
 
Transportation
 
Oil and Gas
 
Total
 
 
 
 
 
 
 
 
Year Ended December 31, 2017
 
 
 
 
 
 
 
Revenues
$
1,267,275

 
$
53,358

 
$
1,427

 
$
1,322,060

Segment operating (losses) earnings (1) (2)
11,700

 
(544
)
 
53

 
11,209

Depreciation, depletion and amortization
7,812

 
5,364

 
423

 
13,599

Property and equipment additions (3)
468

 
351

 
1,825

 
2,644

 
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
 
 
 
 
 
 
Revenues
$
1,043,775

 
$
52,355

 
$
3,410

 
$
1,099,540

Segment operating (losses) earnings (1)
17,045

 
(48
)
 
(533
)
 
16,464

Depreciation, depletion and amortization
9,997

 
7,249

 
1,546

 
18,792

Property and equipment additions
1,321

 
6,868

 
295

 
8,484

 
 
 
 
 
 
 
 
Year Ended December 31, 2015
 
 
 
 
 
 
 
Revenues
$
1,875,885

 
$
63,331

 
$
5,063

 
$
1,944,279

Segment operating (losses) earnings (1) (4)
22,895

 
3,701

 
(19,016
)
 
7,580

Depreciation, depletion and amortization
11,097

 
7,554

 
5,066

 
23,717

Property and equipment additions
2,126

 
6,579

 
2,369

 
11,074

_________________
(1)
Our marketing segment’s operating earnings included inventory liquidation gains of $3.3 million and $8.2 million for the years ended December 31, 2017 and 2016, respectively, and inventory valuation losses of $5.4 million for the year ended December 31, 2015.
(2)
Segment operating (losses) earnings includes approximately $0.4 million of costs related to a voluntary early retirement program that was implemented in August 2017.
(3)
Our marketing segment’s property and equipment additions do not include approximately $1.8 million of tractors acquired during the third quarter of 2017 under capital leases. See Note 13 for further information.
(4)
Our crude oil and natural gas segment’s operating earnings included property impairments of $12.1 million for the year ended December 31, 2015.
Reconciliation of segment earnings to earnings before income taxes
Segment operating earnings reflect revenues net of operating costs and depreciation, depletion and amortization expense and are reconciled to earnings (losses) before income taxes and investment in unconsolidated affiliate, as follows for the periods indicated (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
 
 
 
 
 
Segment operating earnings
$
11,209

 
$
16,464

 
$
7,580

General and administrative (1)
(9,707
)
 
(10,410
)
 
(9,939
)
Operating earnings (losses)
1,502

 
6,054

 
(2,359
)
Loss on deconsolidation of subsidiary
(3,505
)
 
—

 
—

Impairment of investment in unconsolidated affiliate
(2,500
)
 
—

 
—

Interest income
1,103

 
582

 
327

Interest expense
(27
)
 
(2
)
 
(13
)
(Losses) earnings before income taxes and investment
 
 
 
 
 
in unconsolidated affiliate
$
(3,427
)
 
$
6,634

 
$
(2,045
)
_______________
(1)
General and administrative expenses for the year ended December 31, 2017 included approximately $1.0 million of costs related to a voluntary early retirement program we implemented in August 2017.
Identifiable assets by industry segment
Identifiable assets by industry segment were as follows at the dates indicated (in thousands):
 
December 31,
 
2017
 
2016
 
2015
 
 
 
 
 
 
Reporting segment:
 
 
 
 
 
Marketing
$
134,745

 
$
107,257

 
$
96,723

Transportation
29,069

 
32,120

 
35,010

Oil and Gas (1)
425

 
7,279

 
8,930

Cash and other
118,465

 
100,216

 
102,552

Total assets
$
282,704

 
$
246,872

 
$
243,215

____________________
(1)
At December 31, 2017, amount represents our remaining cost method investment in this segment. See Note 3 for further information.