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Segment Data (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Affiliates (1)	[1]	$ 66,647	$ 63,835	$ 191,530	$ 178,559
Third party		70,909	100,275	253,852	319,752
Net revenues		137,556	164,110	445,382	498,311
Cost of materials and other		72,594	105,596	262,713	330,644
Operating expenses (excluding depreciation and amortization presented below)		18,435	15,395	51,820	42,889
Segment contribution margin		46,527	43,119	130,849	124,778
General and administrative expenses		5,280	3,076	15,046	9,798
Depreciation and amortization		6,588	6,702	19,801	19,721
(Gain) loss on asset disposals		(70)	717	(95)	648
Operating income		34,729	32,624	96,097	94,611
Capital spending		3,992	2,991	6,238	7,440
Total assets		767,807		767,807		$ 624,593
Pipelines and transportation
Segment Reporting Information [Line Items]
Affiliates (1)		39,304	36,132	112,694	99,624
Third party		5,281	3,653	16,733	11,618
Net revenues		44,585	39,785	129,427	111,242
Cost of materials and other		4,947	5,055	17,871	14,691
Operating expenses (excluding depreciation and amortization presented below)		12,547	9,499	36,109	29,054
Segment contribution margin		27,091	25,231	75,447	67,497
Capital spending		3,103	2,086	1,893	4,320
Total assets		529,219		529,219		387,333
Wholesale marketing and terminalling
Segment Reporting Information [Line Items]
Affiliates (1)		27,343	27,703	78,836	78,935
Third party		65,628	96,622	237,119	308,134
Net revenues		92,971	124,325	315,955	387,069
Cost of materials and other		67,647	100,541	244,842	315,953
Operating expenses (excluding depreciation and amortization presented below)		5,888	5,896	15,711	13,835
Segment contribution margin		19,436	17,888	55,402	57,281
Capital spending		889	905	4,345	3,120
Total assets		$ 238,588		$ 238,588		$ 237,260
Big Spring Logistic Assets
Segment Reporting Information [Line Items]
Business Acquisition, Transaction Costs			$ 400		$ 400
[1] See Note 3 for a description of our material affiliate revenue transactions.

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