Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011		Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue, Net [Abstract]
Affiliates										$ 167,626	$ 146,376	$ 101,395
Third parties										45,923	35,721	45,166
Total revenues	68,324	49,268	[1]	50,940	45,017	49,369	46,549	45,483	40,696	213,549	182,097	146,561
Operating Expenses [Abstract]
Operations										62,202	52,947	44,003
Depreciation and amortization										33,150	30,682	26,714
General and administrative										6,576	7,719	7,586
Total operating costs and expenses										101,928	91,348	78,303
Operating income (loss)	38,911	22,204	[1]	27,288	23,218	26,230	24,172	22,484	17,863	111,621	90,749	68,258
Equity in earnings of SLC Pipeline										2,552	2,393	1,919
SLC Pipeline acquisition costs												(2,500)
Interest expense, net										(35,959)	(33,994)	(21,490)
Other income										17	17	67
Other nonoperating income (expense), equity earnings and acquisition costs										(33,390)	(31,584)	(22,004)
Income before income taxes	29,766	14,037	[1]	19,031	15,397	18,553	16,335	13,481	10,796	78,231	59,165	46,254
State income tax										(234)	(296)	(20)
Income from continuing operations										77,997	58,869	46,234
Income from discontinued operations										0	0	19,780
Net income	29,701	14,114	[1]	19,013	15,169	18,473	16,259	13,435	10,702	77,997	58,869	66,014
Subsidiaries [Member]
Operating Expenses [Abstract]
Equity in earnings of subsidiaries										0	0	0
SLC Pipeline [Member]
Operating Expenses [Abstract]
Equity in earnings of SLC Pipeline										2,552	2,393	1,919
Eliminations [Member]
Revenue, Net [Abstract]
Affiliates										0	0	0
Third parties										0	0	0
Total revenues										0	0	0
Operating Expenses [Abstract]
Operations										0	0	0
Depreciation and amortization										0	0	0
General and administrative										0	0	0
Total operating costs and expenses										0	0	0
Operating income (loss)										0	0	0
SLC Pipeline acquisition costs												0
Interest expense, net										0	0	0
Other income										0	0	0
Other nonoperating income (expense), equity earnings and acquisition costs										(106,393)	(87,280)	(85,459)
Income before income taxes										(106,393)	(87,280)	(85,459)
State income tax										0	0	0
Income from continuing operations												(85,459)
Income from discontinued operations												(1,579)
Net income										(106,393)	(87,280)	(87,038)
Eliminations [Member] | Subsidiaries [Member]
Operating Expenses [Abstract]
Equity in earnings of subsidiaries										(106,393)	(87,280)	(85,459)
Eliminations [Member] | SLC Pipeline [Member]
Operating Expenses [Abstract]
Equity in earnings of SLC Pipeline										0	0	0
Parent [Member]
Revenue, Net [Abstract]
Affiliates										0	0	0
Third parties										0	0	0
Total revenues										0	0	0
Operating Expenses [Abstract]
Operations										0	0	0
Depreciation and amortization										0	0	0
General and administrative										3,902	5,053	4,697
Total operating costs and expenses										3,902	5,053	4,697
Operating income (loss)										(3,902)	(5,053)	(4,697)
SLC Pipeline acquisition costs												0
Interest expense, net										(24,494)	(23,358)	(11,062)
Other income										0	0	0
Other nonoperating income (expense), equity earnings and acquisition costs										81,899	63,922	70,711
Income before income taxes										77,997	58,869	66,014
State income tax										0	0	0
Income from continuing operations												66,014
Income from discontinued operations												0
Net income										77,997	58,869	66,014
Parent [Member] | Subsidiaries [Member]
Operating Expenses [Abstract]
Equity in earnings of subsidiaries										106,393	87,280	81,773
Parent [Member] | SLC Pipeline [Member]
Operating Expenses [Abstract]
Equity in earnings of SLC Pipeline										0	0	0
Guarantor Subsidiaries [Member]
Revenue, Net [Abstract]
Affiliates										167,626	146,376	101,395
Third parties										45,923	35,721	45,166
Total revenues										213,549	182,097	146,561
Operating Expenses [Abstract]
Operations										62,202	52,947	44,003
Depreciation and amortization										33,150	30,682	26,714
General and administrative										2,674	2,666	2,889
Total operating costs and expenses										98,026	86,295	73,606
Operating income (loss)										115,523	95,802	72,955
SLC Pipeline acquisition costs												(2,500)
Interest expense, net										(11,465)	(10,636)	(10,428)
Other income										17	17	67
Other nonoperating income (expense), equity earnings and acquisition costs										(8,896)	(8,226)	(7,256)
Income before income taxes										106,627	87,576	65,699
State income tax										(234)	(296)	(20)
Income from continuing operations												65,679
Income from discontinued operations												16,094
Net income										106,393	87,280	81,773
Guarantor Subsidiaries [Member] | Subsidiaries [Member]
Operating Expenses [Abstract]
Equity in earnings of subsidiaries										0	0	3,686
Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating Expenses [Abstract]
Equity in earnings of SLC Pipeline										2,552	2,393	1,919
Non-Guarantor Subsidiaries [Member]
Revenue, Net [Abstract]
Affiliates												0
Third parties												0
Total revenues												0
Operating Expenses [Abstract]
Operations												0
Depreciation and amortization												0
General and administrative												0
Total operating costs and expenses												0
Operating income (loss)												0
SLC Pipeline acquisition costs												0
Interest expense, net												0
Other income												0
Other nonoperating income (expense), equity earnings and acquisition costs												0
Income before income taxes												0
State income tax												0
Income from continuing operations												0
Income from discontinued operations												5,265
Net income												5,265
Non-Guarantor Subsidiaries [Member] | Subsidiaries [Member]
Operating Expenses [Abstract]
Equity in earnings of subsidiaries												0
Non-Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating Expenses [Abstract]
Equity in earnings of SLC Pipeline												$ 0

[1] As a result of our November 9, 2011 tankage and terminal asset acquisition from HFC (see Note 3), we have retrospectively adjusted our third quarter of 2011 operating costs and expenses to include expenses incurred by HFC prior to our acquisition. Therefore, summarized quarterly financial data for the third quarter of the year ended December 31, 2011 does not agree to amounts previously reported.