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Segment Data - Schedule of Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Affiliate [1]                 $ 261,014 $ 240,809 $ 156,280
Third party                 322,978 416,800 381,795
Net revenues $ 138,611 $ 137,556 $ 155,342 $ 152,483 $ 159,298 $ 164,110 $ 166,280 $ 167,921 583,992 657,609 538,075
Cost of materials and other                 336,473 429,061 372,890
Operating expenses (excluding depreciation and amortization)                 74,157 58,744 43,274
Segment contribution margin                 173,362 169,804 121,911
General and administrative expenses                 20,815 17,166 11,840
Depreciation and amortization                 26,701 25,990 21,914
Other Operating Income (Expense), Net                 34 891 (20)
Operating income 29,716 $ 34,729 $ 32,256 $ 29,111 31,147 $ 32,624 $ 34,710 $ 27,277 125,812 125,757 88,177
Capital spending                 9,987 11,565 18,403
Total assets 744,447       624,593       744,447 624,593  
Pipelines and Transportation                      
Segment Reporting Information [Line Items]                      
Affiliate                 155,211 138,418 109,298
Third party                 23,107 15,149 12,431
Net revenues                 178,318 153,567 121,729
Cost of materials and other                 22,826 19,878 18,210
Operating expenses (excluding depreciation and amortization)                 54,827 39,934 33,240
Segment contribution margin                 100,665 93,755 70,279
Capital spending                 6,600 6,840 14,262
Total assets 537,580       387,333       537,580 387,333  
Wholesale Marketing and Terminalling                      
Segment Reporting Information [Line Items]                      
Affiliate                 105,803 102,391 46,982
Third party                 299,871 401,651 369,364
Net revenues                 405,674 504,042 416,346
Cost of materials and other                 313,647 409,183 354,680
Operating expenses (excluding depreciation and amortization)                 19,330 18,810 10,034
Segment contribution margin                 72,697 76,049 51,632
Capital spending                 3,387 4,725 $ 4,141
Total assets $ 206,867       237,260       $ 206,867 237,260  
Big Spring Logistic Assets                      
Segment Reporting Information [Line Items]                      
Capitalized acquisition costs         $ 400         $ 400  
[1] See Note 4 for a description of our material affiliate revenue transactions.