Statements of Consolidated Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income (loss)	$ 27,946	$ (20,876)	$ (21,868)
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities:
Depreciation and amortization expenses	8,078	8,006	8,820
Amortization of debt issuance costs	420	0	0
Unit-based compensation expense	479	0	0
Loss on asset disposals	1	512	1,114
Changes in current assets:
Receivables - trade	(409)	(218)	68
Receivables - affiliate	(5,648)	0	0
Prepayments and other current assets	(773)	0	0
Changes in current liabilities:
Accounts payable - trade	1,518	223	(16)
Accounts payable - affiliate	2,847	(616)	(323)
Accrued liabilities and deferred revenue	3,066	861	(492)
Changes in other noncurrent assets and liabilities	(1,701)	682	373
Net cash from (used in) operating activities	35,824	(11,426)	(12,324)
CASH FLOWS USED IN INVESTING ACTIVITIES:
Capital expenditures	(8,136)	(2,561)	(12,249)
Net cash used in investing activities	(8,136)	(2,561)	(12,249)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from issuance of common units, net of underwriters' discount	294,328	0	0
Distributions to General Partner	(50,371)	0	0
Distributions to Common unitholders - Public	(8,893)	0	0
Distributions to Common unitholders - Tesoro	(70,107)	0	0
Distributions to Subordinated unitholders	(222,426)	0	0
Borrowings under revolving credit agreement	50,000	0	0
Offering costs	(6,196)	0	0
Deferred debt issuance costs	(1,852)	0	0
Sponsor contribution of division equity to the Predecessor	3,486	13,987	24,573
Reimbursement of capital expenditures by Sponsor	2,669	0	0
Net cash from (used in) financing activities	(9,362)	13,987	24,573
INCREASE IN CASH AND CASH EQUIVALENTS	18,326	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	0	0	0
CASH AND CASH EQUIVALENTS, END OF YEAR	18,326	0	0
SUPPLEMENTAL CASH FLOW DISCLOSURE:
Interest paid, net of capitalized interest	1,165	0	0
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Capital expenditures included in accounts payable at period end	3,581	194	685
Receivable from affiliate for capital expenditures	3,069	0	0
Transfer of property, plant and equipment from Sponsor, net of accumulated depreciation	4,399	0	0
Working capital requirements retained by Sponsor	$ 4,389	$ 0	$ 0