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Segment Data (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment The following is a summary of business segment operating performance as measured by contribution margin for the periods indicated (in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Pipelines and Transportation
 
 
 
 
 
 
     Net revenues:
 
 
 
 
 
 
         Affiliate
 
138,418

 
$
109,298

 
103,749

         Third party
 
15,149

 
12,431

 
18,423

            Total pipelines and transportation
 
153,567

 
121,729

 
122,172

     Cost of materials and other
 
19,878

 
18,210

 
19,425

     Operating expenses (excluding depreciation and amortization)
 
39,934

 
33,240

 
29,235

     Segment contribution margin
 
$
93,755

 
$
70,279

 
$
73,512

 Capital spending (1)
 
$
6,840

 
$
14,262

 
$
8,478

 
 
 
 
 
 
 
Wholesale Marketing and Terminalling
 
 
 
 
 
 
     Net revenues:
 
 
 
 
 
 
          Affiliate (2)
 
102,391

 
46,982

 
45,815

         Third party
 
401,651

 
369,364

 
280,072

            Total wholesale marketing and terminalling
 
504,042

 
416,346

 
325,887

     Cost of materials and other
 
409,183

 
354,680

 
282,733

     Operating expenses (excluding depreciation and amortization)
 
18,810

 
10,034

 
7,963

     Segment contribution margin
 
$
76,049

 
$
51,632

 
$
35,191

 Capital spending (1)
 
$
4,725

 
$
4,141

 
$
3,289

 
 
 
 
 
 
 
Consolidated
 
 
 
 
 
 
     Net revenues:
 
 
 
 
 
 
          Affiliate
 
$
240,809

 
$
156,280

 
$
149,564

         Third party
 
416,800

 
381,795

 
298,495

            Total Consolidated
 
657,609

 
538,075

 
448,059

     Cost of materials and other
 
429,061

 
372,890

 
302,158

     Operating expenses (excluding depreciation and amortization presented below)
 
58,744

 
43,274

 
37,198

     Contribution margin
 
169,804

 
121,911

 
108,703

     General and administrative expenses
 
17,166

 
11,840

 
10,256

     Depreciation and amortization
 
25,990

 
21,914

 
20,813

     Loss (gain) on asset disposals
 
891

 
(20
)
 
(16
)
     Operating income
 
$
125,757

 
$
88,177

 
$
77,650

 Capital spending (1)
 
$
11,565

 
$
18,403

 
$
11,767


(1) Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Logistic Assets Acquisition for the year ended December 31, 2018.
(2) Affiliate revenue for the wholesale marketing and terminalling segment is presented net of amortization expense pertaining to the Marketing Contract Intangible Acquisition. See Note 3 for additional information.

The following table summarizes the total assets for each segment as of December 31, 2018 and 2017 (in thousands).
 
 
Year Ended December 31,
 
 
2018
 
2017
Pipelines and transportation
 
$
387,333

 
$
349,351

Wholesale marketing and terminalling
 
237,260

 
94,179

     Total assets
 
$
624,593

 
$
443,530