Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Operating revenues	$ 2,094,827	$ 1,869,806	$ 2,226,271
Costs of sales	1,934,061	1,714,239	2,056,807
Gross profit	160,766	155,567	169,464
Income from CST Fuel Supply equity interests	14,906	16,048	10,528
Operating expenses:
Operating expenses	61,297	61,074	72,229
General and administrative expenses	27,887	24,156	36,238
Depreciation, amortization and accretion expense	57,470	54,412	48,227
Total operating expenses	146,654	139,642	156,694
Gain on sales of assets, net	3,401	198	2,719
Operating income	32,419	32,171	26,017
Other income (expense), net	439	848	396
Interest expense	(27,919)	(22,757)	(18,493)
Income before income taxes	4,939	10,262	7,920
Income tax benefit	(18,237)	(453)	(3,542)
Net income	23,176	10,715	11,462
Less: net income attributable to noncontrolling interests	18	11	21
Net income attributable to limited partners	23,158	10,704	11,441
IDR distributions	(4,337)	(3,392)	(1,390)
Net income available to limited partners	$ 18,821	$ 7,312	$ 10,051
Net income per limited partner unit:
Basic earnings per common unit	$ 0.56	$ 0.22	$ 0.35
Diluted earnings per common unit	$ 0.56	0.22	0.35
Basic and diluted earnings per subordinated unit		$ 0.22	$ 0.35
Weighted-average limited partner units:
Basic common units	33,844,823	32,159,156	21,462,665
Diluted common units	33,855,345	32,216,004	21,561,403
Basic and diluted subordinated units		1,151,366	7,525,000
Total diluted common and subordinated units	33,855,345	33,367,370	29,086,403
Distribution paid per common and subordinated unit	$ 2.4800	$ 2.4000	$ 2.2300
Distribution declared (with respect to each respective period) per common and subordinated unit	$ 2.4950	$ 2.4200	$ 2.2800
Supplemental information:
(a) Includes excise taxes of:	$ 79,937	$ 79,537	$ 99,339
(a) Includes revenues from fuel sales to and rental income from related parties of:	414,781	411,945	494,090
(a) Includes rental income of:	86,314	80,594	65,431
(b) Includes rental expense of:	$ 19,472	$ 19,656	$ 17,024