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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Information concerning business activities
Information concerning our various business activities was as follows for the periods indicated (in thousands):
 
Reporting Segments
 
 
 
Marketing
 
Transportation
 
Oil and Gas
 
Total
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017
 
 
 
 
 
 
 
Revenues
$
282,229

 
$
13,082

 
$
—

 
$
295,311

Segment operating (losses) earnings
2,412

 
(915
)
 
—

 
1,497

Depreciation, depletion and amortization
1,911

 
1,329

 
—

 
3,240

Property and equipment additions
178

 
179

 
—

 
357

 
 
 
 
 
 
 
 
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Revenues
$
243,704

 
$
12,310

 
$
863

 
$
256,877

Segment operating (losses) earnings
1,265

 
(430
)
 
(543
)
 
292

Depreciation, depletion and amortization
2,418

 
1,701

 
395

 
4,514

Property and equipment additions
—

 
2,329

 
85

 
2,414

 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
 
 
 
 
 
 
Revenues
$
872,020

 
$
40,153

 
$
1,427

 
$
913,600

Segment operating (losses) earnings
5,496

 
(920
)
 
53

 
4,629

Depreciation, depletion and amortization
5,957

 
4,392

 
423

 
10,772

Property and equipment additions
451

 
189

 
1,825

 
2,465

 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Revenues
$
758,627

 
$
39,517

 
$
2,427

 
$
800,571

Segment operating (losses) earnings
13,148

 
444

 
(1,222
)
 
12,370

Depreciation, depletion and amortization
7,621

 
5,536

 
1,228

 
14,385

Property and equipment additions
514

 
6,480

 
192

 
7,186
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, as follows for the periods indicated (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Segment operating earnings
$
1,497

 
$
292

 
$
4,629

 
$
12,370

General and administrative
(2,787
)
 
(2,114
)
 
(6,884
)
 
(6,252
)
Operating earnings (losses)
(1,290
)
 
(1,822
)
 
(2,255
)
 
6,118

Loss on deconsolidation of subsidiary
(1,870
)
 
—

 
(3,505
)
 
—

Impairment of investments in unconsolidated affiliates
(2,500
)
 
(1,732
)
 
(2,500
)
 
(1,732
)
Losses from equity investment
—

 
(68
)
 
—

 
(468
)
Interest income
370

 
245

 
789

 
444

Interest expense
(8
)
 
—

 
(10
)
 
—

(Losses) earnings before income taxes
$
(5,298
)
 
$
(3,377
)
 
$
(7,481
)
 
$
4,362
Identifiable assets by industry segment
Identifiable assets by industry segment were as follows at the dates indicated (in thousands):
 
September 30,
 
December 31,
 
2017
 
2016
 
 
 
 
Reporting segment:
 
 
 
Marketing
$
107,388

 
$
107,257

Transportation
29,492

 
32,120

Oil and Gas (1)
3,200

 
7,279

Cash and other assets
108,449

 
100,216

Total assets
$
248,529

 
$
246,872

____________________
(1)
At September 30, 2017, amount represents our cost method investment in this segment.