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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2015
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):

      
Segment Operating
  
Depreciation Depletion and
  
Property and Equipment
 
   
Revenues
  
Earnings (loss)
  
Amortization
  
Additions
 
Year ended December 31, 2015-
            
Marketing
 $1,875,885  $22,895(1) $11,097  $2,126 
Transportation
  63,331   3,701   7,554   6,579 
Oil and gas
  5,063   (19,016)(2)  5,066   2,369 
   $1,944,279  $7,580  $23,717  $11,074 
Year ended December 31, 2014-
                
Marketing
 $4,050,497  $20,854(1) $9,626  $13,598 
Transportation
  68,968   4,750   7,416   8,994 
Oil and gas
  13,361   (7,510)(2)  7,573   7,931 
   $4,132,826  $18,094  $24,615  $30,523 
Year ended December 31, 2013-
                
Marketing
 $3,863,057  $40,369(1) $7,682  $11,343 
Transportation
  68,783   5,180   7,099   3,165 
Oil and gas
  14,129   (2,113)(2)  7,494   13,094 
   $3,945,969  $43,436  $22,275  $27,602 
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(1) Marketing segment operating earnings included inventory liquidation and valuation losses totaling $5,357,000, $14,247,000 and $3,824,000 for 2015, 2014 and 2013, respectively.
(2) Oil and gas segment operating earnings include gains on property sales totaling $2,528,000 during 2014 and property impairments totaling $12,082,000, $8,009,000 and $2,630,000 for 2015, 2014 and 2013, respectively.
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):

   
Years Ended December 31,
 
   
2015
  
2014
  
2013
 
Segment operating earnings
 $7,580  $18,094  $43,436 
- General and administrative expenses
  (9,939)  (8,613)  (9,060)
Operating earnings (loss)
  (2,359)  9,481   34,376 
- Interest income
  327   301   198 
- Interest expense
  (13)  (2)  (24)
Earnings (loss) from continuing operations before
            
income taxes and discontinued operations
 $(2,045) $9,780  $34,550 
Identifiable assets by industry segment
Identifiable assets by industry segment are as follows (in thousands):

   
Years Ended December 31,
 
   
2015
  
2014
  
2013
 
Marketing
 $96,723  $189,332  $306,693 
Transportation
  35,010   37,643   34,406 
Oil and gas
  8,930   25,888   37,093 
Cash and other
  102,552   87,951   69,890 
   $243,215  $340,814  $448,082