Segment Disclosures, Results (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
REVENUES
Affiliate									$ 142,667		$ 77,443		$ 19,477
Third-party									14,172		9,894		9,580
Total Revenues	47,738	43,953	36,885	28,263	29,457	28,622	21,566	7,692	156,839		87,337		29,057
OPERATING AND MAINTENANCE EXPENSES
Segment Operating and Maintenance Expenses	20,086	20,541	16,566	15,576	15,666	13,857	12,418	12,361	72,769		54,302		50,277
IMBALANCE SETTLEMENT GAINS
Segment Imbalance Settlement Gains									(9,686)		(7,153)		(3,250)
DEPRECIATION AND AMORTIZATION EXPENSES
Segment Depreciation and Amortization Expenses									13,057		11,277		11,233
GENERAL AND ADMINISTRATIVE EXPENSES
Segment General and Administrative Expense									6,006		3,656		1,739
(GAIN) LOSS ON ASSET DISPOSALS
Segment Loss on Asset Disposals									535		26		830
OPERATING INCOME (LOSS)
Segment Operating Income (Loss)									74,158		25,229		(31,772)
Interest and financing costs, net									(8,992)		(1,610)		0
Interest income									48		0		0
NET INCOME (LOSS)	15,696	16,541	15,226	8,044	9,297	12,287	4,926	(8,011)	55,507		18,499		(34,001)
Segment Reporting Information, Additional Information
Capital Expenditures									91,352		18,686		4,534
Identifiable Assets	363,178				233,809				363,178		233,809		192,621
Crude Oil Gathering
REVENUES
Affiliate									71,934	[1]	44,570	[1]	19,477	[1]
Third-party									498		389		115
Total Revenues									72,432		44,959		19,592
OPERATING AND MAINTENANCE EXPENSES
Segment Operating and Maintenance Expenses									44,477		27,691		22,872
IMBALANCE SETTLEMENT GAINS
Segment Imbalance Settlement Gains									(4,703)		(3,970)		(3,250)
DEPRECIATION AND AMORTIZATION EXPENSES
Segment Depreciation and Amortization Expenses									3,383		3,141		3,097
GENERAL AND ADMINISTRATIVE EXPENSES
Segment General and Administrative Expense									2,875		1,304		563
(GAIN) LOSS ON ASSET DISPOSALS
Segment Loss on Asset Disposals									0		(10)		62
OPERATING INCOME (LOSS)
Segment Operating Income (Loss)									26,400		16,803		(3,752)
Segment Reporting Information, Additional Information
Capital Expenditures									17,014		5,546		271
Identifiable Assets	87,194				72,795				87,194		72,795		68,902
Terminalling, Transportation and Storage
REVENUES
Affiliate									70,733	[1]	32,873	[1]	0	[1]
Third-party									13,674		9,505		9,465
Total Revenues									84,407		42,378		9,465
OPERATING AND MAINTENANCE EXPENSES
Segment Operating and Maintenance Expenses									28,292		26,611		27,405
IMBALANCE SETTLEMENT GAINS
Segment Imbalance Settlement Gains									(4,983)		(3,183)		0
DEPRECIATION AND AMORTIZATION EXPENSES
Segment Depreciation and Amortization Expenses									9,674		8,136		8,136
GENERAL AND ADMINISTRATIVE EXPENSES
Segment General and Administrative Expense									3,131		2,352		1,176
(GAIN) LOSS ON ASSET DISPOSALS
Segment Loss on Asset Disposals									535		36		768
OPERATING INCOME (LOSS)
Segment Operating Income (Loss)									47,758		8,426		(28,020)
Segment Reporting Information, Additional Information
Capital Expenditures									74,338		13,140		4,263
Identifiable Assets	205,246				140,323				205,246		140,323		123,719
Corporate
OPERATING INCOME (LOSS)
Unallocated general and administrative expenses									(9,707)		(5,120)		(2,229)
Interest and financing costs, net									(8,992)		(1,610)		0
Interest income									48		0		0
Segment Reporting Information, Additional Information
Identifiable Assets	$ 70,738				$ 20,691				$ 70,738		$ 20,691		$ 0

[1] Our Predecessors did not record revenue for transactions with Tesoro in the Terminalling, Transportation and Storage segment or for trucking services in the Crude Oil Gathering segment for the TLLP Predecessor prior to the Initial Offering or for assets acquired in the Acquisitions from Tesoro prior to the effective date of each acquisition. Our FERC and NDPSC regulated pipelines were our sole source of affiliate revenues in the Crude Oil Gathering segment.