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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Information concerning business activities and assets by segment
Information concerning the Company's various business activities is summarized as follows (in thousands):

- Nine Month Comparison

     
Segment
  
Depreciation
  
Property and
 
     
Operating
  
Depletion and
  
Equipment
 
  
Revenues
  
Earnings
  
Amortization
  
Additions
 
Period Ended September 30, 2016
            
Marketing
 
$
758,627
  
$
13,148
  
$
7,621
  
$
514
 
Transportation
  
39,517
   
444
   
5,536
   
6,480
 
Oil and gas
  
2,427
   
(1,222
)
  
1,228
   
192
 
  
$
800,571
  
$
12,370
  
$
14,385
  
$
7,186
 
Period Ended September 30, 2015
                
Marketing
 
$
1,541,999
  
$
22,405
  
$
8,336
  
$
2,128
 
Transportation
  
49,921
   
3,212
   
5,691
   
1,584
 
Oil and gas
  
4,104
   
(6,406
)
  
4,059
   
2,635
 
  
$
1,596,024
  
$
19,211
  
$
18,086
  
$
6,347
 


- Three Month Comparison

     
Segment
  
Depreciation
  
Property and
 
     
Operating
  
Depletion and
  
Equipment
 
  
Revenues
  
Earnings
  
Amortization
  
Additions
 
Period Ended September 30, 2016
            
Marketing
 
$
243,704
  
$
1,265
  
$
2,418
  
$
-
 
Transportation
  
12,310
   
(430
)
  
1,701
   
2,329
 
Oil and gas
  
863
   
(543
)
  
395
   
85
 
  
$
256,877
  
$
292
  
$
4,514
  
$
2,414
 
Period Ended September 30, 2015
                
Marketing
 
$
423,014
  
$
3,715
  
$
2,782
  
$
-
 
Transportation
  
15,748
   
918
   
1,892
   
1,050
 
Oil and gas
  
1,131
   
(2,909
)
  
1,294
   
458
 
  
$
439,893
  
$
1,724
  
$
5,968
  
$
1,508
 
Reconciliation of segment earnings to earnings before income taxes
Segment operating earnings reflect revenues net of operating costs and depreciation, depletion and amortization and are reconciled to earnings from continuing operations before income taxes, as follows (in thousands):

  
Nine Months Ended
  
Three Months Ended
 
  
September 30,
  
September 30,
 
  
2016
  
2015
  
2016
  
2015
 
Segment operating earnings
 
$
12,370
  
$
19,211
  
$
292
  
$
1,724
 
- General and administrative
  
(6,252
)
  
(7,750
)
  
(2,114
)
  
(2,101
)
Operating earnings
  
6,118
   
11,461
   
(1,822
)
  
(377
)
- Interest income
  
444
   
237
   
245
   
64
 
- Interest expense
  
-
   
(5
)
  
-
   
(1
)
Earnings before income tax
 
$
6,562
  
$
11,693
  
$
(1,577
)
 
$
(314
)
Identifiable assets by industry segment
Identifiable assets by industry segment are as follows (in thousands):

  
September 30,
  
December 31,
 
  
2016
  
2015
 
Marketing
 
$
98,689
  
$
96,723
 
Transportation
  
34,558
   
35,010
 
Oil and gas
  
7,459
   
8,930
 
Other
  
92,205
   
102,552
 
  
$
232,911
  
$
243,215