Rose Rock Midstream 10-Q 12 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013	Oct. 31, 2013	Oct. 31, 2013
		Common Units [Member]	Subordinated Units [Member]	Common Class A [Member]
Entity Registrant Name	'Rose Rock Midstream, L.P.	'	'	'
Entity Central Index Key	'0001527622	'	'	'
Document Type	'10-Q	'	'	'
Document Period End Date	30-Sep-13	'	'	'
Amendment Flag	'false	'	'	'
Document Fiscal Year Focus	'2013	'	'	'
Document Fiscal Period Focus	'Q3	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'
Entity Filer Category	'Accelerated Filer	'	'	'
Entity Common Stock, Shares Outstanding	'	16,643,581	8,389,709	1,250,000

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$1,914	$108
Accounts receivable	257,901	222,862
Receivable from affiliates	178	57
Inventories	32,720	24,840
Other current assets	1,587	2,750
Total current assets	294,300	250,617
Property, plant and equipment (net of accumulated depreciation)	313,193	291,530
Equity method investment	77,449	0
Goodwill	27,261	0
Other intangible assets (net of accumulated amortization)	5,760	0
Other assets, net	4,776	2,579
Total assets	722,739	544,726
Current liabilities:	'	'
Accounts payable	237,010	220,791
Payable to affiliates	6,298	2,649
Accrued liabilities	7,426	4,681
Other current liabilities	3,757	3,722
Total current liabilities	254,491	231,843
Long-term debt	85,043	4,562
Commitments and contingencies (Note 6)	'	'
Partners' capital:	'	'
General partner	7,935	6,159
Total partners' capital	383,205	308,321
Total liabilities and partners' capital	722,739	544,726
SemGroup [Member] | Class A units [Member] | Sem Group [Member]	'	'
Partners' capital:	'	'
Limited partners' capital	18,008	0
Subordinated Units [Member] | SemGroup [Member]	'	'
Partners' capital:	'	'
Limited partners' capital	51,304	135,036
Common Units [Member] | Public [Member]	'	'
Partners' capital:	'	'
Limited partners' capital	252,360	129,134
Common Units [Member] | SemGroup [Member]	'	'
Partners' capital:	'	'
Limited partners' capital	$53,598	$37,992

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance	$0	$0
Property, plant and equipment, accumulated depreciation	45,657	34,580
Other intangible assets, accumulated amortization	$258	$0
Common Units [Member] | Public [Member]	'	'
Common units, issued	13,753,872	7,000,000
Common units, outstanding	13,753,872	7,000,000
SemGroup [Member] | Subordinated Units [Member]	'	'
Subordinated units, issued	8,389,709	8,389,709
Subordinated units, outstanding	8,389,709	8,389,709
SemGroup [Member] | Common Units [Member]	'	'
Common units, issued	2,889,709	1,389,709
Common units, outstanding	2,889,709	1,389,709
Capital Unit, Class A [Member] | SemGroup [Member] | Sem Group [Member]	'	'
Class A units, issued	1,250,000	0
Class A units, outstanding	1,250,000	0

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Revenues, including revenues from affiliates (Note 9):	'		'		'		'
Product	$166,050		$120,358		$473,594		$435,814
Service	15,781		11,196		40,891		32,932
Other	0		0		0		-59
Total revenues	181,831		131,554		514,485		468,687
Expenses, including expenses from affiliates (Note 9):	'		'		'		'
Costs of products sold, exclusive of depreciation and amortization	157,550		111,790		446,507		412,847
Operating	9,248		5,698		20,473		17,146
General and administrative	3,146		4,081		9,961		8,830
Depreciation and amortization	4,130		3,066		11,327		9,032
Total expenses	174,074		124,635		488,268		447,855
Earnings from equity method investment	3,527		0		10,431		0
Operating income	11,284		6,919		36,648		20,832
Other expenses:	'		'		'		'
Interest expense	1,873		450		6,121		1,407
Other expense	0		0		-12		72
Total other expenses	1,873		450		6,109		1,479
Net income	9,411		6,469		30,539		19,353
Earnings Per Unit [Abstract]	'		'		'		'
Net income allocated to general partner	188		129		611		387
Net income allocated to limited partners	9,096	[1]	6,340	[1]	29,689	[1]	18,966	[1]
General Partner Interest [Member]	'		'		'		'
Earnings Per Unit [Abstract]	'		'		'		'
Net income allocated to general partner	315		129		850		387
Common Class A [Member]	'		'		'		'
Earnings Per Unit [Abstract]	'		'		'		'
Net income allocated to limited partners	-103		0		37		0
Earnings per limited partner unit, basic and diluted (Note 8)	($0.08)		$0		$0.03		$0
Basic weighted average number of limited partner units outstanding:	'		'		'		'
Basic weighted average number of limited partner units outstanding	1,250,000		0		1,200,000		0
Diluted weighted average number of limited partner units outstanding:	'		'		'		'
Diluted weighted average number of limited partner units outstanding	1,250,000		0		1,200,000		0
Common Units [Member]	'		'		'		'
Earnings Per Unit [Abstract]	'		'		'		'
Net income allocated to limited partners	6,116		3,170		18,329		9,483
Earnings per limited partner unit, basic (Note 8)	'		$0.38		'		$1.13
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$0.45		$0.38		$1.46		$1.13
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	$0.45		$0.38		$1.45		$1.13
Basic weighted average number of limited partner units outstanding:	'		'		'		'
Basic weighted average number of limited partner units outstanding	13,442,000		8,390,000		12,587,000		8,390,000
Diluted weighted average number of limited partner units outstanding:	'		'		'		'
Diluted weighted average number of limited partner units outstanding	13,479,000		8,409,000		12,621,000		8,404,000
Subordinated Units [Member]	'		'		'		'
Earnings Per Unit [Abstract]	'		'		'		'
Net income allocated to limited partners	$3,083		$3,170		$11,323		$9,483
Earnings per limited partner unit, basic and diluted (Note 8)	$0.37		$0.38		$1.35		$1.13
Basic weighted average number of limited partner units outstanding:	'		'		'		'
Basic weighted average number of limited partner units outstanding	8,390,000		8,390,000		8,390,000		8,390,000
Diluted weighted average number of limited partner units outstanding:	'		'		'		'
Diluted weighted average number of limited partner units outstanding	8,390,000		8,390,000		8,390,000		8,390,000
[1]	(**) We calculate net income allocated to limited partners based on the distributions pertaining to the current periodbs available cash as defined by our partnership agreement. After adjusting for the appropriate periodbs distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner, limited partners and participating securities in accordance with the contractual terms of the partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings. Class A units do not participate in cash distributions, but are allocated a proportional share of undistributed earnings.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Partners' Capital Account, Unit-based Compensation	$578	'
Cash flows from operating activities:	'	'
Net income	30,539	19,353
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	11,327	9,032
Loss (gain) on disposition of assets	0	56
Amortization of debt issuance costs	631	261
Non-cash equity compensation	578	218
Net unrealized (gain) loss related to derivative instruments	-1,759	-432
Earnings from equity method investment	10,431	0
Changes in assets and liabilities:	'	'
Decrease (increase) in accounts receivable	-35,039	-73,660
Decrease (increase) in receivable from affiliates	-121	2,093
Decrease (increase) in inventories	-9,659	-7,557
Decrease (increase) in other current assets	1,888	106
Decrease (increase) in other assets	7	-21
Increase (decrease) in accounts payable and accrued liabilities	20,074	83,408
Increase (decrease) in payable to affiliates	3,649	2,668
Net cash provided by operating activities	22,115	35,525
Cash flows from investing activities:	'	'
Capital expenditures	-14,346	-17,552
Proceeds from sale of long-lived assets	0	145
Investments in non-consolidated affiliate	-78,156	0
Acquisition of Barcas Field Services	-49,969	0
Distributions in excess of equity earnings of affiliates	707	0
Net cash used in investing activities	-141,764	-17,407
Cash flows from financing activities:	'	'
Debt issuance costs	-2,827	-239
Borrowings on credit facility	349,000	76,500
Principal payments on credit facility	-268,500	-76,500
Principal payments on capital lease obligations	-18	-16
Proceeds from issuance of common limited partners units	210,226	0
Contribution from general partner	3,242	0
Cash consideration in excess of historical cost in common control transaction	-143,216	0
Cash distributions to partners	-26,452	-14,074
Net cash provided by (used in) financing activities	121,455	-14,329
Net increase (decrease) in cash and cash equivalents	1,806	3,789
Cash and cash equivalents at beginning of period	108	9,709
Cash and cash equivalents at end of period	$1,914	$13,498

Overview

Overview	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
OVERVIEW	'
	OVERVIEW
	Rose Rock Midstream, L.P. is a Delaware limited partnership. The general partner of Rose Rock Midstream, L.P. is Rose Rock Midstream GP, LLC, which is a wholly-owned subsidiary of SemGroup Corporation. SemGroup Corporation is a Delaware corporation headquartered in Tulsa, Oklahoma that provides diversified midstream services to the energy industry. SemGroup Corporation is the successor entity of SemGroup, L.P., which was an Oklahoma limited partnership.
	The terms “we,” “our,” “us,” “Rose Rock,” the “Partnership” and similar language used in these notes to the unaudited condensed consolidated financial statements refer to Rose Rock Midstream, L.P, and its subsidiaries. The term “SemGroup” refers to SemGroup Corporation, SemGroup, L.P., and their other controlled subsidiaries, including Rose Rock Midstream GP, LLC.
	Basis of presentation
	These condensed consolidated financial statements include the accounts of Rose Rock Midstream, L.P. and its controlled subsidiaries.
	These condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and the rules and regulations of the SEC. These condensed consolidated financial statements include all normal and recurring adjustments that, in the opinion of management, are necessary to present fairly the financial position of the Partnership and the results of its operations and its cash flows. All significant transactions between Rose Rock Midstream, L.P. and its consolidated subsidiaries have been eliminated.
	These condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet at December 31, 2012, is derived from audited financial statements.
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts and disclosures in the financial statements. Although management believes these estimates are reasonable, actual results could differ materially from these estimates. The results of operations for the three months and nine months ended September 30, 2013, are not necessarily indicative of the results to be expected for the full year ending December 31, 2013.
	Pursuant to the rules and regulations of the SEC, the accompanying condensed consolidated financial statements do not include all of the information and notes normally included with financial statements prepared in accordance with accounting principles generally accepted in the United States. Certain reclassifications have been made to conform previously reported balances to the current presentation. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2012, which are included in our Annual Report on Form 10-K for the year ended December 31, 2012, filed with the SEC.
	Our significant accounting policies are consistent with those described in our Annual Report on Form 10-K for the year ended December 31, 2012.
	Recent accounting pronouncements
	On January 31, 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2013-01, "Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities," which clarifies the scope of the offsetting disclosure requirements in ASU 2011-11, "Disclosures About Offsetting Assets and Liabilities." Under ASU 2013-01, the disclosure requirements apply to derivative instruments accounted for in accordance with Accounting Standards Codification ("ASC") 815, "Derivatives and Hedging," including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending arrangements that are either offset on the balance sheet or subject to an enforceable master netting arrangement or similar agreement. ASU 2013-01 is effective for fiscal years beginning on or after January 1, 2013, and interim periods within those years. Retrospective application is required for all comparative periods presented. We adopted this guidance in the first quarter of 2013. The impact of adoption was not material.
	On February 28, 2013, the FASB issued ASU 2013-04, "Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date (a consensus of the FASB Emerging Issues Task Force)." The ASU requires entities to “measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of the following:
	•the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors; and
	•any additional amount the reporting entity expects to pay on behalf of its co-obligors.”
	Required disclosures include a description of the joint and several arrangement and the total outstanding amount of the obligation for all joint parties. The ASU permits entities to aggregate disclosures (as opposed to providing separate disclosures for each joint and several obligation). These disclosure requirements are incremental to the existing related-party disclosure requirements in ASC 850, "Related Party Disclosures." The ASU is effective for public entities for all prior periods in fiscal years beginning on or after December 15, 2013 (and interim reporting periods within those years). We will adopt this guidance in the first quarter of 2014. The impact is not expected to be material.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2013
Acquisition [Abstract]	'
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	'
	ACQUISITIONS
	SemCrude Pipeline, L.L.C
	Contribution Agreement
	On January 8, 2013, we entered into a Contribution Agreement (the “Contribution Agreement”) with SemGroup and certain of its subsidiaries. Pursuant to the terms of the Contribution Agreement, on January 11, 2013, we acquired a 33% interest in SemCrude Pipeline, L.L.C. (“SCPL”) from SemGroup in exchange for (i) cash of approximately $189.5 million, (ii) the issuance of 1.5 million common units, (iii) the issuance of 1.25 million Class A units, and (iv) an increase of the capital account of our general partner and a related issuance of general partner interest, to allow our general partner to maintain its two percent general partner interest in us. SCPL owns a 51% membership interest in White Cliffs Pipeline, L.L.C. ("White Cliffs"), which owns a 527-mile pipeline system ("the White Cliffs Pipeline") that transports crude oil from Platteville, Colorado in the Denver-Julesburg Basin to Cushing, Oklahoma.
	The Class A units are not entitled to receive any distributions of available cash (other than upon liquidation) prior to the first day of the month immediately following the first month for which the average daily throughput volume on the White Cliffs Pipeline for such month is 125,000 barrels per day or greater. Upon such date, the Class A units will automatically convert into common units.
	The cash consideration was funded through a borrowing under our credit facility of approximately $130.3 million and the sale of 2.0 million common units through a private placement, as described below. The 1.5 million common units were valued at $29.63 per unit, or $44.4 million, based on the sales price to third-parties in the private placement. The Class A units were valued at $29.63 per unit discounted for the expected forbearance of distributions, or $30.5 million. The contribution to the general partner's capital account was made in the amount of $2.7 million.
	We incurred $3.7 million of cost, of which $1.6 million of equity issuance costs were offset against proceeds, $1.6 million was related to the borrowing and was deferred, and $0.5 million was expensed as general and administrative expenses in the condensed consolidated statement of income.
	We own a 33% interest in SCPL, which is effectively a 17% interest in White Cliffs. We account for our membership in SCPL as an equity method investment. As the transaction was between entities under common control, we recorded our investment in SCPL based on SemGroup's historical cost. The purchase price in excess of historical cost was treated as an equity transaction with SemGroup, which reduced the partners' capital accounts of our general and limited partners on a pro-rata basis.
	As part of the transaction, we are required to fund 33% of SCPL's capital contribution requirements for White Cliffs related to an expansion project adding a 12-inch line from Platteville, Colorado to Cushing, Oklahoma. For the three months and nine months ended September 30, 2013, we contributed $12.0 million and $31.8 million, respectively. Remaining contributions will be made in 2014 and are expected to total $17.8 million.
	Common Unit Purchase Agreement
	On January 8, 2013, we entered into a Common Unit Purchase Agreement with certain purchasers (the “Purchasers”), pursuant to which, on January 11, 2013, 2.0 million common units were issued and sold to the Purchasers in a private placement at a price of $29.63 per common unit for aggregate consideration of approximately $59.3 million (the “Private Placement”). The Partnership used the net proceeds from the Private Placement to fund a portion of the purchase of a 33% interest in SCPL.
	Registration Rights Agreement
	In connection with the closing of the Private Placement on January 11, 2013, we entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with the Purchasers. Pursuant to the terms of the Registration Rights Agreement, within 30 days following the closing of the Private Placement, we were required to prepare and file a registration statement (the “Registration Statement”) to permit the public resale of the common units sold to the Purchasers in the Private Placement.
	On February 5, 2013, we filed the Registration Statement with the SEC. The Registration Statement was declared effective by the SEC at 9:00 a.m. (Washington, D.C. time) on February 13, 2013. If the Purchasers become prohibited from using the Registration Statement under certain circumstances, or if the Registration Statement ceases to be effective or unusable for certain periods of time, we could be liable to the Purchasers for liquidated damages calculated in accordance with a formula, and subject to the limitations set forth in the Registration Rights Agreement.
	Barcas Field Services, LLC
	On August 1, 2013, we executed a definitive agreement to acquire the assets of Barcas Field Services, LLC ("Barcas"), which owns and operates a crude oil trucking fleet for $50.0 million in cash. The transaction closed on September 1, 2013. Highlights of the acquisition include the following:
	•	114 trucks, 120 trailers and miscellaneous equipment; and
	•	a long-term take-or-pay customer transportation agreement.
	We have included Barcas in our condensed consolidated financial statements as of September 1, 2013. During the three months and nine months ended September 30, 2013, our condensed consolidated statements of income did not include material amounts of revenue or operating income related to Barcas. The proforma impact to comparative prior year periods, had the acquisition occurred at the beginning of the comparative prior year period, is not significant.
	We have received a preliminary independent appraisal of the fair value of the assets acquired in the Barcas acquisition. The estimates of fair value reflected as of September 30, 2013, are subject to change and such changes could be material. We currently expect to complete the valuation process prior to filing our Form 10-K for the year ending December 31, 2013. We have preliminarily estimated the fair value of the assets acquired as follows (in thousands):
	Property, plant and equipment	$	16,690
	Customer contract intangible	6,018
	Goodwill	27,261
	Total assets acquired	$	49,969
	Goodwill represents the excess of the estimated consideration paid for the acquired business over the fair value of the individual assets acquired. Goodwill primarily represents the value of synergies between the acquired entity and the Partnership, the opportunity to use the acquired business as a platform for growth and the acquired assembled workforce. We estimate that all of the goodwill will be deductible for federal income tax purposes and will be amortized on a straight-line basis over 15 years.
	Tampa Pipeline
	On November 11, 2013, we announced the acquisition of a 12-mile, 12-inch crude oil pipeline from Noble Energy, Inc. that extends from Platteville, Colorado to Tampa, Colorado for a purchase price of $8.3 million. The pipeline was recently constructed by Noble Energy, Inc. and placed into service with the acquisition. The pipeline connects our Platteville, Colorado crude oil terminal to the Tampa, Colorado crude oil market.

Investment_in_nonconsolidated_

Investment in non-consolidated affiliate Investment in non-consolidated affiliate	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Equity Method Investments Disclosure [Text Block]	'
	INVESTMENT IN NON-CONSOLIDATED AFFILIATE
	SemCrude Pipeline, L.L.C.
	We account for our 33% interest in SCPL under the equity method. Under the equity method, we do not report the individual assets and liabilities of SCPL on our condensed consolidated balance sheets. Instead, our membership interest is reflected in one line as a noncurrent asset on our condensed consolidated balance sheets.
	For the three months and nine months ended September 30, 2013, we recorded equity in earnings of SCPL of $3.5 million and $10.4 million, respectively. For the three months and nine months ended September 30, 2013, we received cash distributions of $4.1 million and $11.1 million, respectively. Distributions are paid on a one-month lag. Accordingly, the cash distributions received for the three months and nine months ended September 30, 2013 relate to earnings from June to August 2013 and January to August 2013, respectively.
	SCPL's only substantial asset is a 51% interest in White Cliffs. Thus, our 33% interest in SCPL is effectively a 17% interest in White Cliffs.
	Certain summarized income statement information of White Cliffs for the three months and nine months ended September 30, 2013 is shown below (in thousands):
		Three Months Ended September 30, 2013		Nine Months Ended September 30, 2013
	Revenue	$	31,453	$	92,238
	Operating, general and administrative expenses	$	5,141	$	14,433
	Depreciation and amortization expense	$	4,720	$	14,150
	Net income	$	21,579	$	63,642
	The equity in earnings of White Cliffs for the three months and nine months ended September 30, 2013, recorded by SCPL, is less than 51% of the net income of White Cliffs for the same period, which ultimately reduces our equity in earnings of SCPL such that our share of earnings is less than 17% of the net income of White Cliffs. This is due to certain general and administrative expenses SCPL incurs in managing the operations of White Cliffs that the other owners are not obligated to share. Such expenses are recorded by White Cliffs and are allocated to SCPL's ownership interest. White Cliffs recorded $0.5 million and $1.2 million of such general and administrative expense for the three months and nine months ended September 30, 2013, respectively.

Financial_Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Financial Instruments Disclosure [Text Block]	'
	FINANCIAL INSTRUMENTS
	Commodity derivative contracts
	Our results of operations and cash flows are impacted by changes in market prices for petroleum products. This exposure to commodity price risk is managed, in part, by entering into various commodity derivatives.
	We seek to manage the price risk associated with our marketing operations by limiting our net open positions through (i) the concurrent purchase and sale of like quantities of crude oil to create back-to-back transactions that are intended to lock in positive margins based on the timing, location or quality of the crude oil purchased and delivered or (ii) derivative contracts. Our storage and transportation assets also can be used to mitigate location and time basis risk. All marketing activities are subject to our Comprehensive Risk Management Policy, which establishes limits in order to manage risk and mitigate financial exposure.
	Our commodity derivatives can be comprised of crude oil and natural gas liquids forward contracts and futures contracts. These are defined as follows:
	Forward contracts – Over the counter contracts to buy or sell a commodity at an agreed upon future date. The buyer and seller agree on specific terms (price, quantity, delivery period and location) and conditions at the inception of the contract.
	Futures contracts – Exchange traded contracts to buy or sell a commodity. These contracts are standardized by the exchange in terms of quality, quantity, delivery period and location for each commodity.
	We record certain commodity derivative assets and liabilities at fair value at each balance sheet date. The tables below summarize the balances of these assets and liabilities at September 30, 2013 and December 31, 2012 (in thousands):
		30-Sep-13										31-Dec-12
		Level 1				Netting*			Total			Level 1			Netting*			Total
	Assets	$	857			$	(132	)	$	725		$	22		$	(22	)	$	—
	Liabilities	132				(132		)	—			1,056			(22		)	1,034
	Net assets (liabilities) at fair value	$	725			$	—		$	725		$	(1,034	)	$	—		$	(1,034	)
	* Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange.
	“Level 1” measurements use as inputs unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. These include futures contracts that are traded on an exchange.
	“Level 2” measurements use as inputs market observable and corroborated prices for similar derivative contracts. Assets and liabilities classified as Level 2 include over-the-counter (“OTC”) traded physical fixed price purchases and sales forward contracts.
	“Level 3” measurements use as inputs information from a pricing service and internal valuation models incorporating observable and unobservable market data. These include physical fixed price purchases and sales forward contracts for which there is not a highly liquid OTC market and, therefore, are not included in Level 1 or Level 2 above.
	Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the measurement requires judgment, and may affect the valuation of assets and liabilities and their placement within the fair value levels. At September 30, 2013, all of our physical fixed price forward purchases and sales contracts were being accounted for as normal purchases and normal sales.
	There were no financial assets or liabilities classified as Level 2 or Level 3 during the three months and nine months ended September 30, 2013 and 2012, as such no rollforward of activity has been presented.
	The following table sets forth the notional quantities for commodity derivative instruments entered into during the periods indicated (in thousands of barrels):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013		2012
	Sales	695			470			2,025		1,153
	Purchases	805			380			2,095		1,066
	We have not designated any of our commodity derivative instruments as accounting hedges. We record the fair value of the derivative instruments on our condensed consolidated balance sheets in other current assets and other current liabilities. The fair value of our commodity derivative assets and liabilities recorded to other current assets and other current liabilities was as follows (in thousands):
		30-Sep-13							31-Dec-12
		Assets				Liabilities			Assets			Liabilities
	Commodity contracts	$	725			$	—		$	—		$	1,034
	We have posted margin deposits as collateral with brokers who have the right of set off associated with these funds. Our margin accounts were in a net liability position at September 30, 2013 of $0.1 million. At December 31, 2012, our margin deposit balance was $1.9 million. These margin account balances have not been offset against our net commodity derivative instrument (contract) positions. Had these margin account balances been netted against our net commodity derivative instrument (contract) positions as of September 30, 2013 and December 31, 2012, we would have had net asset positions of $0.6 million and $0.9 million, respectively.
	Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2013				2012			2013			2012
	Commodity contracts	$	(1,652	)		$	(631	)	$	(2,430	)	$	(342	)

Long_Term_Debt

Long Term Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Long-term Debt	'
	LONG-TERM DEBT
	Credit facility
	On January 11, 2013, our credit facility capacity was increased to $385 million and we borrowed $133.5 million in connection with the purchase of a 33% interest in SCPL from SemGroup and to pay transaction related expenses. Approximately $1.6 million of related costs have been capitalized and will be amortized over the remaining life of the facility.
	On September 20, 2013, the credit agreement was amended to extend the agreement to September 20, 2018, and permit the increase of the facility by not more than $200 million, subject to certain conditions. The amended agreement allows the Partnership to incur unsecured or subordinated debt without limitation, subject to certain conditions, and provides alternative financial performance covenants at our election after the issuance of $200 million or more unsecured or subordinated debt, in aggregate. Additionally, the interest rate and commitment fees related to the revolving facility were lowered.
	At September 30, 2013, we had outstanding borrowings of $85.0 million on this facility, of which $55.0 million incurred interest at the alternate base rate ("ABR") plus an applicable margin, and $30 million incurred interest at the Eurodollar rate plus an applicable margin. The interest rate in effect at September 30, 2013, on $55.0 million of ABR borrowings was 4.50%. The interest rate in effect at September 30, 2013, on $30 million of Eurodollar rate borrowings was 2.53%.
	We had $31.8 million in outstanding letters of credit at September 30, 2013 and the rate per annum was 2.25%. In addition, a fronting fee of 0.25% is charged on outstanding letters of credit.
	A commitment fee that ranges from 0.375% to 0.50%, depending on a leverage ratio specified in the credit agreement, is charged on any unused capacity of the revolving credit facility.
	At September 30, 2013, we had $7.6 million of secured bilateral letters of credit outstanding. The interest rate in effect was 1.75% on $0.6 million and 2.0% on $7.0 million. Secured bilateral letters of credit are external to the facility and do not reduce revolver availability.
	At September 30, 2013, we were in compliance with the terms of the credit agreement.
	At September 30, 2013, $3.7 million in capitalized loan fees, net of accumulated amortization, was recorded in other noncurrent assets, which is being amortized over the life of the facility.
	At September 30, 2013, we had $43 thousand ($69 thousand including current portion) of capital lease obligations reported as long-term debt on the consolidated balance sheet.
	We estimate that the fair value of our long-term debt was not materially different than the reported values at September 30, 2013, and is categorized as a Level 3 measurement. It is our belief that neither the market interest rates nor our credit profile have changed significantly enough to have had a material impact on the fair value of our debt outstanding at September 30, 2013.
	Shelf Registration Statement
	On May 15, 2013, we filed a universal shelf registration statement with the SEC on Form S-3, which became effective on May 29, 2013. Pursuant to this registration statement, we may issue debt securities in one or more series, as to any of which Rose Rock Finance Corporation ("Rose Rock Finance") may be a co-issuer on a joint and several basis with Rose Rock. Rose Rock Finance was incorporated under the laws of the State of Delaware on May 6, 2013, and is 100 percent-owned by Rose Rock. Rose Rock Finance was organized for the purpose of co-issuing our debt securities and has no material assets or any liabilities.
	Any debt securities that we offer under this registration statement will be direct, unsecured general obligations. The debt securities will be either senior debt securities or subordinated debt securities. As of September 30, 2013, no debt securities have been issued under this registration statement.
	In the event that one or more of certain 100 percent-owned subsidiaries of Rose Rock (Rose Rock Midstream Operating, LLC, Rose Rock Midstream Energy GP, LLC and/or Rose Rock Midstream Crude, L.P.) guarantees such debt securities, when issued, such guarantees will be full and unconditional and will constitute the joint and several obligations of such subsidiaries. Rose Rock Midstream Operating, LLC, Rose Rock Midstream Energy GP, LLC and Rose Rock Midstream Crude, L.P. are our sole subsidiaries, other than Rose Rock Finance. We have no assets or operations independent of our subsidiaries, and there are no significant restrictions upon the ability of us, or any of our subsidiaries, to obtain funds from its respective subsidiaries by dividend or loan. None of the assets of our subsidiaries represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X under the Securities Act of 1933, as amended.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	Bankruptcy matters
	On July 22, 2008 (the “Petition Date”), SemGroup, L.P., SemCrude, L.P. (“SemCrude”), the predecessor of Rose Rock, and Eaglwing, L.P. (“Eaglwing”) filed petitions for reorganization under Chapter 11 of the U.S. Bankruptcy Code. While in bankruptcy, SemGroup, L.P. filed a plan of reorganization with the court, which was confirmed on October 28, 2009 (the “Plan of Reorganization”). The Plan of Reorganization determined, among other things, how pre-Petition Date obligations would be settled, the equity structure of the reorganized company upon emergence and the financing arrangements upon emergence. SemGroup, SemCrude, and Eaglwing emerged from bankruptcy protection on November 30, 2009 (the “Emergence Date”).
	(a)	Confirmation order appeal
	Luke Oil appeal. On October 21, 2009, Luke Oil Company, C&S Oil/Cross Properties, Inc., Wayne Thomas Oil and Gas and William R. Earnhardt Company (collectively, “Luke Oil”) filed an objection to the Plan of Reorganization “to the extent that the Plan of Reorganization may alter, impair or otherwise adversely affect Luke Oil’s legal rights or other interests.” On October 28, 2009, the bankruptcy court overruled the Luke Oil objection and entered the confirmation order. On November 6, 2009, Luke Oil filed a Notice of Appeal. On December 23, 2009, Luke Oil’s appeal was docketed in the United States District Court for the District of Delaware. SemGroup filed a motion to dismiss the appeal as equitably moot. On May 21, 2012, the District Court entered an order granting SemGroup's motion to dismiss Luke Oil’s appeal of the confirmation order. On June 18, 2012, Luke Oil filed its Notice of Appeal, notifying the District Court and the parties to the lawsuit that it was appealing the decision of the District Court to the United States Court of Appeals for the Third Circuit. On August 27, 2013, the United States Court of Appeals for the Third Circuit issued an opinion, and on September 18, 2013 issued a judgment, reversing the District Court’s dismissal of the confirmation order and remanding the case to the District Court for consideration on the merits of Luke Oil’s appeal of the confirmation order. On October 1, 2013, at the request of the parties, the District Court entered an order staying the case and referring it to a magistrate judge for mediation. While SemGroup believes that this action is without merit and is vigorously defending this matter on appeal, an adverse ruling on this account could have a material adverse impact on us. We are indemnified by SemGroup against any loss in this matter pursuant to the terms of the omnibus agreement.
	(b)	Claims reconciliation process
	A large number of parties have made claims against SemGroup for obligations alleged to have been incurred prior to the Petition Date. On September 15, 2010, the bankruptcy court entered an order estimating the contingent, unliquidated and disputed claims and authorizing distributions to holders of allowed claims. Pursuant to that order, SemGroup has begun making distributions to the claimants. SemGroup continues to attempt to settle unresolved claims.
	Pursuant to the Plan of Reorganization, SemGroup committed to settle all pre-petition claims by paying a specified amount of cash, issuing a specified number of warrants and issuing a specified number of shares of SemGroup Corporation common stock. The resolution of most of the outstanding claims will not impact the total amount of consideration SemGroup will give to the claimants; instead, the resolution of the claims will impact the relative share of the total consideration that each claimant receives.
	However, there is a specified group of claims for which SemGroup could be required to pay additional funds to settle. Pursuant to the Plan of Reorganization, SemGroup set aside a specified amount of restricted cash at the Emergence Date, which SemGroup expected to be sufficient to settle this group of claims. Since the Emergence Date, SemGroup has made significant progress in resolving these claims and continues to believe that the cash set aside at the Emergence Date will be sufficient to pay these claims. However, SemGroup has not yet reached a resolution of all of these claims and, if the total settlement amount of these claims exceeds the specified amount, SemGroup will be required to pay additional funds to these claimants and we could be required to share in this expense. We are indemnified by SemGroup against any loss in this matter pursuant to the terms of the omnibus agreement.
	Environmental
	We may, from time to time, experience leaks of petroleum products from our facilities and, as a result of which, we may incur remediation obligations or property damage claims. In addition, we are subject to numerous environmental regulations. Failure to comply with these regulations could result in the assessment of fines or penalties by regulatory authorities.
	The Kansas Department of Health and Environment (“KDHE”) initiated discussions during SemGroup’s bankruptcy proceeding regarding five of our sites in Kansas that KDHE believed, based on their historical use, may have soil or groundwater contamination in excess of state standards. KDHE sought our agreement to undertake assessments of these sites to determine whether they are contaminated. SemGroup entered into a Consent Agreement and Final Order with KDHE to conduct environmental assessments on the sites and to pay KDHE’s costs associated with their oversight of this matter. SemGroup has conducted Phase II investigations at all sites. Three of the five sites have limited amounts of soil contamination that will be excavated and/or remediated on site. Three of the five sites appear to have ground water contamination that may require further delineation and/or on-going monitoring. Work plans have been submitted to, and approved by, the KDHE. SemGroup does not anticipate any penalties or fines for these historical sites. We are indemnified by SemGroup against any loss in this matter pursuant to the terms of the omnibus agreement.
	Blueknight claim
	Blueknight Energy Partners, L.P. (“Blueknight”), which was formerly a subsidiary of SemGroup, together with other entities related to Blueknight, entered into a Shared Services Agreement on April 7, 2009, with SemCrude and SemManagement, L.L.C. (which are currently subsidiaries of SemGroup). The services provided by SemCrude to Blueknight under this agreement included assisting Blueknight with movement of crude oil belonging to Blueknight’s customers and with the operation of Blueknight’s Oklahoma pipeline system and its Cushing, Oklahoma terminal. Under the subsequent amendments to the agreements beginning in May 2010, certain of these services were phased out and Blueknight began to perform all services necessary for the movement of its crude oil and the operation of its Cushing terminal without SemCrude's assistance.
	In a letter dated August 18, 2011, Blueknight claimed that SemCrude owes Blueknight approximately 141,000 barrels of crude oil. SemGroup responded to Blueknight’s letter denying their charges and requesting documentation from Blueknight of its claim. On February 14, 2012, after months of interaction between the parties through which Blueknight was requested to substantiate its claim, Blueknight filed suit against SemGroup and other related companies in the District Court of Oklahoma County, Oklahoma. On May 1, 2012, the case was transferred to Tulsa County, Oklahoma. On July 2, 2012, the Tulsa County District Court appointed a Special Master to review terminal operations accounting records and determine whether 141,000 barrels of crude oil owned by Blueknight is missing after three months of operations in April through June, 2010. On June 11, 2013, the Special Master’s Report was filed with the District Court finding a shortage in Blueknight’s Cushing terminal and Oklahoma pipeline system of 148,000 barrels. However, after a review of all records created during that three month time period, the Special Master was unable to determine how the shortage might have occurred and she was unable to determine the ownership of the potential shortage.
	We are currently seeking discovery in the District Court of documentation and testimony on the potential cause and the impact, if any, of the shortage found by the Special Master. Blueknight is resisting discovery and has asked for summary judgment against SemCrude and the other defendants for the entire terminal and pipeline system shortage. SemGroup will continue to defend its position; however, we cannot predict the outcome. We are indemnified by SemGroup against any loss in this matter pursuant to the terms of the omnibus agreement.
	Other matters
	We are party to various other claims, legal actions and complaints arising in the ordinary course of business. In the opinion of our management, the ultimate resolution of these claims, legal actions and complaints, after consideration of amounts accrued, insurance coverage and other arrangements, will not have a material effect on our consolidated financial position, results of operations or cash flows. However, the outcome of such matters is inherently uncertain and estimates of our consolidated liabilities may change materially as circumstances develop.
	Asset retirement obligations
	We may be subject to removal and restoration costs upon retirement of our facilities. However, we are unable to predict when, or if, our pipelines, storage tanks and related facilities would become completely obsolete and require decommissioning. Accordingly, we have not recorded a liability or corresponding asset, as both the amount and timing of such potential future costs are indeterminable.
	Purchase and sale commitments
	We routinely enter into agreements to purchase and sell petroleum products at specified future dates. We create a margin for these purchases by entering into various types of physical and financial sales and exchange transactions through which we seek to maintain a position that is substantially balanced between purchases on the one hand and sales and future delivery obligations on the other. We account for derivatives at fair value with the exception of commitments which have been designated as normal purchases and sales, for which we do not record assets or liabilities related to these agreements until the product is purchased or sold. At September 30, 2013, such commitments included the following (in thousands):
		Volume	Value
		(Barrels)
	Fixed price purchases	202	$	20,324
	Fixed price sales	330	$	34,749
	Floating price purchases	18,015	$	1,781,247
	Floating price sales	17,743	$	1,796,814
	Certain of the commitments shown in the table above relate to agreements to purchase product from a counterparty and to sell a similar amount of product (in a different location) to the same counterparty. Many of the commitments shown in the table above are cancellable by either party, as long as notice is given within the time frame specified in the agreement, generally 30 to 120 days.
	See Note 2 for commitments related to the White Cliffs Pipeline expansion.

Partners_Capital_and_Distribut

Partners' Capital and Distributions	9 Months Ended
	Sep. 30, 2013
Partners' Capital [Abstract]	'
PARTNERS' CAPITAL AND DISTRIBUTIONS	'
		PARTNERS’ CAPITAL AND DISTRIBUTIONS
	Unaudited condensed consolidated statement of changes in partners’ capital
	The following table shows the changes in our partners’ capital accounts from December 31, 2012 to September 30, 2013 (in thousands):
		Common				Common				Subordinated			Class A Units			General			Total
		Units -				Units -				Units						Partner			Partners’
		Public				SemGroup										Interest			Capital
	Balance at December 31, 2012	$	129,134			$	37,992			$	135,036		$	—		$	6,159		$	308,321
	Net income	14,429				3,900				11,323			37			850			30,539
	Equity issuance	210,226				44,445				—			30,543			5,986			291,200
	Purchase price in excess of historical cost of interest in SemCrude Pipeline, L.L.C.	(90,516		)		(29,063		)		(84,379		)	(12,572		)	(4,418		)	(220,948		)
	Unvested distribution equivalent rights	(33		)		—				—			—			—			(33		)
	Cash distributions	(11,458		)		(3,676		)		(10,676		)	—			(642		)	(26,452		)
	Non-cash equity compensation	578				—				—			—			—			578
	Balance at September 30, 2013	$	252,360			$	53,598			$	51,304		$	18,008		$	7,935		$	383,205
	Distribution rights
	We intend to pay a minimum quarterly distribution of $0.3625 per unit, to the extent we have sufficient cash from operations after establishment of cash reserves and payment of fees and expenses, including payments to our general partner and its affiliates. We refer to this cash as “available cash,” and it is defined in our partnership agreement. Our ability to pay the minimum quarterly distribution is subject to various restrictions and other factors.
	Our partnership agreement requires that we distribute all of our available cash each quarter in the following manner:
	•	first, 98.0% to the holders of common units and 2.0% to our general partner, until each common unit has received the minimum quarterly distribution of $0.3625, plus any arrearages from prior quarters;
	•	second, 98.0% to the holders of subordinated units and 2.0% to our general partner, until each subordinated unit has received the minimum quarterly distribution of $0.3625; and
	•	third, 98.0% to all unitholders, pro rata, and 2.0% to our general partner, until each unit has received a distribution of $0.416875.
	If cash distributions to our unitholders exceed $0.416875 per unit in any quarter, our general partner will receive, in addition to distributions on its 2.0% general partner interest, increasing percentages, up to 48.0%, of the cash we distribute in excess of that amount. We refer to these distributions as “incentive distributions.” The following table summarizes the incentive distribution levels:
								Marginal Percentage
								Interest in Distributions
			Total Quarterly Distribution					Unitholders			General		Incentive
			Per Unit Target Amount								Partner		Distribution
											Interest		Rights
	Minimum Quarterly Distribution				$0.36			98	%		2	%	—	%
	First Target Distribution	above	$0.36		up to	$0.42		98	%		2	%	—	%
	Second Target Distribution	above	$0.42		up to	$0.45		85	%		2	%	13	%
	Third Target Distribution	above	$0.45		up to	$0.54		75	%		2	%	23	%
	Thereafter				above	$0.54		50	%		2	%	48	%
	The following table shows the cash distributions paid or declared per common limited partner unit during 2013 and 2012:
	Quarter Ended		Record Date		Payment Date		Distribution Per Unit
	31-Dec-11		3-Feb-12		13-Feb-12		$0.07	*
	31-Mar-12		7-May-12		15-May-12		$0.37
	30-Jun-12		6-Aug-12		14-Aug-12		$0.38
	30-Sep-12		5-Nov-12		14-Nov-12		$0.39
	31-Dec-12		4-Feb-13		14-Feb-13		$0.40
	31-Mar-13		6-May-13		15-May-13		$0.43
	30-Jun-13		5-Aug-13		14-Aug-13		$0.44
	30-Sep-13		5-Nov-13		14-Nov-13		$0.45
	* Calculated as the $0.3625 minimum quarterly distribution, prorated based on the length of time during the three months ended December 31, 2011, that was subsequent to our initial public offering.
	Equity incentive plan
	On December 8, 2011, the board of directors of our general partner adopted the Rose Rock Midstream Equity Incentive Plan (the “Incentive Plan”). We have reserved 840,000 limited partner common units for issuance to non-management directors and employees under the Incentive Plan. We granted 43,392 restricted unit awards during the nine months ended September 30, 2013, with a weighted average grant date fair value of $34.22. At September 30, 2013, there are 83,620 unvested restricted unit awards that have been granted pursuant to the Incentive Plan. Generally, the awards vest three years after the date of grant for employees and one year after the date of grant for non-managerial directors, contingent upon the continued service of the recipients and may be subject to accelerated vesting in the event of involuntary terminations. We had vestings of 3,872 restricted unit awards for the nine months ended September 30, 2013.
	The holders of restricted units granted in 2012 are entitled to equivalent distributions (“UUDs”) to be received upon vesting of the restricted unit awards. The distributions will be settled in common units, based on the market price of our limited partner common units as of the close of business on the vesting date. The UUDs are subject to the same forfeiture and acceleration conditions as the associated restricted units. Of the 3,872 restricted unit awards that vested for the nine months ended September 30, 2013, 140 were UUDs that vested. At September 30, 2013, the value of the UUDs related to unvested restricted units was approximately $93 thousand. This is equivalent to 2,904 common units, based on the quarter end close of business market price of our common units of $31.95 per unit. Distributions related to the 2013 restricted unit awards will be settled in cash upon vesting.
	Equity issuance
	On August 13, 2013, we issued 4,750,000 common limited partner units to the public for proceeds of $152.5 million, net of underwriting discounts and commissions of $6.4 million. Our general partner contributed $3.2 million to the Partnership to maintain its 2% ownership. Proceeds were used to repay borrowings on our credit facility.

Earnings_Per_Limited_Partner_U

Earnings Per Limited Partner Unit	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
EARNINGS PER LIMITED PARTNER UNIT	'
	EARNINGS PER LIMITED PARTNER UNIT
	Net income is allocated to the general partner and the limited partners in accordance with their respective partnership percentages, after giving effect to any priority income allocations, such as incentive distributions that are allocated to the general partner.
	Basic and diluted earnings per limited partner unit is determined by dividing net income allocated to the limited partners by the weighted average number of limited partner units for such class outstanding during the period. Diluted earnings per limited partner unit reflects, where applicable, the potential dilution that could occur if securities or other agreements to issue additional units of a limited partner class, such as restricted unit awards, were exercised, settled or converted into such units.
	The following table sets forth the computation of basic and diluted earnings per limited partner unit for the three months and nine months ended September 30, 2013 and 2012 (in thousands, except per unit data):
		Three Months Ended September 30,					Nine Months Ended September 30,
		2013			2012		2013		2012
	Net income	$	9,411		$	6,469	$	30,539	$	19,353
	Less: General partner’s incentive distribution earned (*)	127			—		239		—
	Less: General partner’s 2.0% ownership	188			129		611		387
	Net income allocated to limited partners	$	9,096		$	6,340	$	29,689	$	18,966
	Numerator for basic and diluted earnings per limited partner unit (**):
	Allocation of net income among limited partner interests:
	Net income allocable to common units	$	6,116		$	3,170	$	18,329	$	9,483
	Net income allocable to subordinated units	3,083			3,170		11,323		9,483
	Net income (loss) allocable to Class A units	(103		)	—		37		—
	Net income allocated to limited partners	$	9,096		$	6,340	$	29,689	$	18,966
	Denominator for basic and diluted earnings per limited partner unit:
	Basic weighted average number of common units outstanding	13,442			8,390		12,587		8,390
	Effect of non-vested restricted units	37			19		34		14
	Diluted weighted average number of common units outstanding	13,479			8,409		12,621		8,404
	Basic and diluted weighted average number of subordinated units outstanding	8,390			8,390		8,390		8,390
	Basic and diluted weighted average number of Class A units outstanding	1,250			—		1,200		—
	Net income per limited partner unit:
	Common units (basic)	$	0.45		$	0.38	$	1.46	$	1.13
	Common units (diluted)	$	0.45		$	0.38	$	1.45	$	1.13
	Subordinated units (basic and diluted)	$	0.37		$	0.38	$	1.35	$	1.13
	Class A units (basic and diluted)	$	(0.08	)	$	—	$	0.03	$	—
	(*) Based on the amount of the distribution declared per common and subordinated unit related to earnings for the three months and nine months ended September 30, 2012, our general partner was not entitled to receive incentive distributions for those periods.
	(**) We calculate net income allocated to limited partners based on the distributions pertaining to the current period’s available cash as defined by our partnership agreement. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner, limited partners and participating securities in accordance with the contractual terms of the partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings. Class A units do not participate in cash distributions, but are allocated a proportional share of undistributed earnings.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
RELATED PARTY TRANSACTIONS	'
	RELATED PARTY TRANSACTIONS
	Direct employee expenses
	We do not directly employ any persons to manage or operate our business. These functions are performed by employees of SemGroup. SemGroup charged us $2.3 million and $2.9 million during the three months ended September 30, 2013 and 2012, respectively, for direct employee costs. SemGroup charged us $8.3 million and $8.9 million during the nine months ended September 30, 2013 and 2012, respectively. These expenses were recorded to operating expenses and general and administrative expenses in our condensed consolidated statements of income.
	Allocated expenses
	SemGroup incurs expenses to provide certain indirect corporate general and administrative services to its subsidiaries. Such expenses include employee compensation costs, professional fees and rental fees for office space, among other expenses. SemGroup charged us $1.6 million and $2.8 million during the three months ended September 30, 2013 and 2012, respectively, for such allocated costs. SemGroup charged us $4.6 million and $4.8 million during the nine months ended September 30, 2013 and 2012, respectively. These expenses were recorded to general and administrative expenses in our condensed consolidated statements of income.
	NGL Energy Partners LP
	SemGroup holds certain ownership interests in NGL Energy Partners LP (“NGL Energy”) and its general partner. During the three months ended September 30, 2013 and 2012, we made purchases of condensate at market prices from NGL Energy in the amounts of $8.0 million and $10.9 million, respectively. During the nine months ended September 30, 2013 and 2012, we made purchases from NGL Energy in the amounts of $8.0 million and $36.6 million, respectively. We received reimbursements from NGL Energy for transition services in the amounts of $56.0 thousand and $140.0 thousand for the three months and nine months ended September 30, 2013, respectively. There were no reimbursements from NGL Energy during the three months and the nine months ended September 30, 2012.
	High Sierra Crude Oil and Marketing, LLC
	We generated revenues from High Sierra Crude Oil and Marketing, LLC ("High Sierra"), which is a subsidiary of NGL Energy, of $15.7 million and $12.4 million for the three months ended September 30, 2013 and 2012, respectively. We generated revenues from High Sierra of $68.6 million and $23.4 million for the nine months ended September 30, 2013 and 2012, respectively. Purchases from High Sierra were $6.5 million and $16.3 million for the three months ended September 30, 2013 and 2012, respectively. Purchases from High Sierra were $34.7 million and $32.2 million for the nine months ended September 30, 2013 and 2012, respectively. Transactions with High Sierra primarily relate to transportation and marketing of crude oil and condensate. In accordance with ASC 845-10-15, these transactions were reported as revenue on a net basis in our condensed consolidated statements of operations and comprehensive income as the purchases of inventory and subsequent sales of the inventory were with the same counterparty.
	SemGas, L.P.
	We purchase condensate at market prices from SemGas, L.P. (“SemGas”), which is a wholly-owned subsidiary of SemGroup. Purchases from SemGas were $6.6 million and $2.3 million for the three months ended September 30, 2013 and 2012, respectively. Purchases from SemGas were $15.7 million and $7.5 million for the nine months ended September 30, 2013 and 2012, respectively.
	White Cliffs
	SemGroup owns 51% of White Cliffs and exercises significant influence over it. We indirectly own 17% of White Cliffs through our investment in SCPL subsequent to our January 2013 acquisition. We generated storage revenues from White Cliffs of $0.8 million and $0.6 million for the three months ended September 30, 2013 and 2012, respectively. We generated storage revenues from White Cliffs of $2.1 million and $1.8 million for the nine months ended September 30, 2013 and 2012, respectively.
	Legal services
	The law firm of Conner & Winters, LLP, of which Mark D. Berman is a partner, performs legal services for us. Mr. Berman is the spouse of Candice L. Cheeseman, General Counsel and Secretary. Mr. Berman does not perform any legal services for us. We paid $0.1 million and $0.1 million in legal fees and related expenses to this law firm during the three months ended September 30, 2013 and 2012, respectively. We paid $0.4 million and $0.4 million in legal fees and related expenses to this law firm during the nine months ended September 30, 2013 and 2012, respectively.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2013
Other Significant Noncash Transactions [Line Items]	'
Cash Flow, Supplemental Disclosures [Text Block]	'
	10	SUPPLEMENTAL CASH FLOW INFORMATION
	Acquisition
	In connection with the acquisition of a 33% interest in SCPL (Note 2), we issued 1.5 million common units and 1.25 million Class A units, valued at $44.4 million and $30.5 million, respectively, as non-cash consideration to SemGroup. In addition, a non-cash contribution of $2.7 million was recorded to the general partner's capital account.
	As the transaction occurred between parties under common control, the purchase price in excess of SemGroup's historical cost of the 33% interest in SCPL was treated as an equity transaction with SemGroup, which reduced the partners' capital accounts pro-rata based on ownership percentages. Of the $221.0 million of purchase price in excess of historical cost, $143.2 million represented cash consideration in excess of historical cost and the remaining $77.8 million reduction represented the non-cash portion of the transaction related to equity consideration.
	Other supplemental disclosures
	We paid cash interest of $5.0 million and $0.8 million for the nine months ended September 30, 2013 and 2012, respectively.
	No significant amounts were accrued for purchases of property, plant and equipment for the nine months ended September 30, 2013. We accrued $1.5 million for purchases of property, plant and equipment for the nine months ended September 30, 2012.

Overview_Policies

Overview (Policies)	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	OVERVIEW
	Rose Rock Midstream, L.P. is a Delaware limited partnership. The general partner of Rose Rock Midstream, L.P. is Rose Rock Midstream GP, LLC, which is a wholly-owned subsidiary of SemGroup Corporation. SemGroup Corporation is a Delaware corporation headquartered in Tulsa, Oklahoma that provides diversified midstream services to the energy industry. SemGroup Corporation is the successor entity of SemGroup, L.P., which was an Oklahoma limited partnership.
	The terms “we,” “our,” “us,” “Rose Rock,” the “Partnership” and similar language used in these notes to the unaudited condensed consolidated financial statements refer to Rose Rock Midstream, L.P, and its subsidiaries. The term “SemGroup” refers to SemGroup Corporation, SemGroup, L.P., and their other controlled subsidiaries, including Rose Rock Midstream GP, LLC.
	Basis of presentation
	These condensed consolidated financial statements include the accounts of Rose Rock Midstream, L.P. and its controlled subsidiaries.
	These condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and the rules and regulations of the SEC. These condensed consolidated financial statements include all normal and recurring adjustments that, in the opinion of management, are necessary to present fairly the financial position of the Partnership and the results of its operations and its cash flows. All significant transactions between Rose Rock Midstream, L.P. and its consolidated subsidiaries have been eliminated.
	These condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet at December 31, 2012, is derived from audited financial statements.
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts and disclosures in the financial statements. Although management believes these estimates are reasonable, actual results could differ materially from these estimates. The results of operations for the three months and nine months ended September 30, 2013, are not necessarily indicative of the results to be expected for the full year ending December 31, 2013.
	Pursuant to the rules and regulations of the SEC, the accompanying condensed consolidated financial statements do not include all of the information and notes normally included with financial statements prepared in accordance with accounting principles generally accepted in the United States. Certain reclassifications have been made to conform previously reported balances to the current presentation. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2012, which are included in our Annual Report on Form 10-K for the year ended December 31, 2012, filed with the SEC.
	Our significant accounting policies are consistent with those described in our Annual Report on Form 10-K for the year ended December 31, 2012.
	Recent accounting pronouncements
	On January 31, 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2013-01, "Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities," which clarifies the scope of the offsetting disclosure requirements in ASU 2011-11, "Disclosures About Offsetting Assets and Liabilities." Under ASU 2013-01, the disclosure requirements apply to derivative instruments accounted for in accordance with Accounting Standards Codification ("ASC") 815, "Derivatives and Hedging," including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending arrangements that are either offset on the balance sheet or subject to an enforceable master netting arrangement or similar agreement. ASU 2013-01 is effective for fiscal years beginning on or after January 1, 2013, and interim periods within those years. Retrospective application is required for all comparative periods presented. We adopted this guidance in the first quarter of 2013. The impact of adoption was not material.
	On February 28, 2013, the FASB issued ASU 2013-04, "Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date (a consensus of the FASB Emerging Issues Task Force)." The ASU requires entities to “measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of the following:
	•the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors; and
	•any additional amount the reporting entity expects to pay on behalf of its co-obligors.”
	Required disclosures include a description of the joint and several arrangement and the total outstanding amount of the obligation for all joint parties. The ASU permits entities to aggregate disclosures (as opposed to providing separate disclosures for each joint and several obligation). These disclosure requirements are incremental to the existing related-party disclosure requirements in ASC 850, "Related Party Disclosures." The ASU is effective for public entities for all prior periods in fiscal years beginning on or after December 15, 2013 (and interim reporting periods within those years). We will adopt this guidance in the first quarter of 2014. The impact is not expected to be material.
Consolidation, Policy [Policy Text Block]	'
	Basis of presentation
	These condensed consolidated financial statements include the accounts of Rose Rock Midstream, L.P. and its controlled subsidiaries.
	These condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and the rules and regulations of the SEC. These condensed consolidated financial statements include all normal and recurring adjustments that, in the opinion of management, are necessary to present fairly the financial position of the Partnership and the results of its operations and its cash flows. All significant transactions between Rose Rock Midstream, L.P. and its consolidated subsidiaries have been eliminated.
	These condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet at December 31, 2012, is derived from audited financial statements.
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts and disclosures in the financial statements. Although management believes these estimates are reasonable, actual results could differ materially from these estimates. The results of operations for the three months and nine months ended September 30, 2013, are not necessarily indicative of the results to be expected for the full year ending December 31, 2013.
	Pursuant to the rules and regulations of the SEC, the accompanying condensed consolidated financial statements do not include all of the information and notes normally included with financial statements prepared in accordance with accounting principles generally accepted in the United States. Certain reclassifications have been made to conform previously reported balances to the current presentation. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2012, which are included in our Annual Report on Form 10-K for the year ended December 31, 2012, filed with the SEC.
	Our significant accounting policies are consistent with those described in our Annual Report on Form 10-K for the year ended December 31, 2012.
Recent Accounting Pronouncements	'
	Recent accounting pronouncements
	On January 31, 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2013-01, "Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities," which clarifies the scope of the offsetting disclosure requirements in ASU 2011-11, "Disclosures About Offsetting Assets and Liabilities." Under ASU 2013-01, the disclosure requirements apply to derivative instruments accounted for in accordance with Accounting Standards Codification ("ASC") 815, "Derivatives and Hedging," including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending arrangements that are either offset on the balance sheet or subject to an enforceable master netting arrangement or similar agreement. ASU 2013-01 is effective for fiscal years beginning on or after January 1, 2013, and interim periods within those years. Retrospective application is required for all comparative periods presented. We adopted this guidance in the first quarter of 2013. The impact of adoption was not material.
	On February 28, 2013, the FASB issued ASU 2013-04, "Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date (a consensus of the FASB Emerging Issues Task Force)." The ASU requires entities to “measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of the following:
	•the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors; and
	•any additional amount the reporting entity expects to pay on behalf of its co-obligors.”
	Required disclosures include a description of the joint and several arrangement and the total outstanding amount of the obligation for all joint parties. The ASU permits entities to aggregate disclosures (as opposed to providing separate disclosures for each joint and several obligation). These disclosure requirements are incremental to the existing related-party disclosure requirements in ASC 850, "Related Party Disclosures." The ASU is effective for public entities for all prior periods in fiscal years beginning on or after December 15, 2013 (and interim reporting periods within those years). We will adopt this guidance in the first quarter of 2014. The impact is not expected to be material.
Fair Value Measurements	'
	“Level 1” measurements use as inputs unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. These include futures contracts that are traded on an exchange.
	“Level 2” measurements use as inputs market observable and corroborated prices for similar derivative contracts. Assets and liabilities classified as Level 2 include over-the-counter (“OTC”) traded physical fixed price purchases and sales forward contracts.
	“Level 3” measurements use as inputs information from a pricing service and internal valuation models incorporating observable and unobservable market data. These include physical fixed price purchases and sales forward contracts for which there is not a highly liquid OTC market and, therefore, are not included in Level 1 or Level 2 above.
	Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the measurement requires judgment, and may affect the valuation of assets and liabilities and their placement within the fair value levels. At September 30, 2013, all of our physical fixed price forward purchases and sales contracts were being accounted for as normal purchases and normal sales.

Financial_Instruments_Financia

Financial Instruments Financial Instruments (Policies)	9 Months Ended
	Sep. 30, 2013
Financial Instruments [Abstract]	'
Fair Value Measurement, Policy [Policy Text Block]	'
	“Level 1” measurements use as inputs unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. These include futures contracts that are traded on an exchange.
	“Level 2” measurements use as inputs market observable and corroborated prices for similar derivative contracts. Assets and liabilities classified as Level 2 include over-the-counter (“OTC”) traded physical fixed price purchases and sales forward contracts.
	“Level 3” measurements use as inputs information from a pricing service and internal valuation models incorporating observable and unobservable market data. These include physical fixed price purchases and sales forward contracts for which there is not a highly liquid OTC market and, therefore, are not included in Level 1 or Level 2 above.
	Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the measurement requires judgment, and may affect the valuation of assets and liabilities and their placement within the fair value levels. At September 30, 2013, all of our physical fixed price forward purchases and sales contracts were being accounted for as normal purchases and normal sales.

Acquisitions_Acquisitions_Tabl

Acquisitions Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2013
Acquisitions [Abstract]	'
Preliminary purchase price allocation	'
	We have preliminarily estimated the fair value of the assets acquired as follows (in thousands):
	Property, plant and equipment	$	16,690
	Customer contract intangible	6,018
	Goodwill	27,261
	Total assets acquired	$	49,969

Investment_in_nonconsolidated_1

Investment in non-consolidated affiliate Investment in non-consolidated affiliate (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Income Statement Information on Equity Method Investments [Table Text Block]	'
	Certain summarized income statement information of White Cliffs for the three months and nine months ended September 30, 2013 is shown below (in thousands):
		Three Months Ended September 30, 2013		Nine Months Ended September 30, 2013
	Revenue	$	31,453	$	92,238
	Operating, general and administrative expenses	$	5,141	$	14,433
	Depreciation and amortization expense	$	4,720	$	14,150
	Net income	$	21,579	$	63,642

Financial_Instruments_Tables

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summarized balance of assets and liabilities	'
	We record certain commodity derivative assets and liabilities at fair value at each balance sheet date. The tables below summarize the balances of these assets and liabilities at September 30, 2013 and December 31, 2012 (in thousands):
		30-Sep-13										31-Dec-12
		Level 1				Netting*			Total			Level 1			Netting*			Total
	Assets	$	857			$	(132	)	$	725		$	22		$	(22	)	$	—
	Liabilities	132				(132		)	—			1,056			(22		)	1,034
	Net assets (liabilities) at fair value	$	725			$	—		$	725		$	(1,034	)	$	—		$	(1,034	)
	* Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange.
Changes in the fair value of commodity derivatives	'
	There were no financial assets or liabilities classified as Level 2 or Level 3 during the three months and nine months ended September 30, 2013 and 2012, as such no rollforward of activity has been presented.
Notional quantities for commodity derivative instruments	'
	The following table sets forth the notional quantities for commodity derivative instruments entered into during the periods indicated (in thousands of barrels):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013		2012
	Sales	695			470			2,025		1,153
	Purchases	805			380			2,095		1,066
Fair value of commodity derivative assets and liabilities	'
	The fair value of our commodity derivative assets and liabilities recorded to other current assets and other current liabilities was as follows (in thousands):
		30-Sep-13							31-Dec-12
		Assets				Liabilities			Assets			Liabilities
	Commodity contracts	$	725			$	—		$	—		$	1,034
Realized and unrealized gains from commodity derivatives	'
	Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2013				2012			2013			2012
	Commodity contracts	$	(1,652	)		$	(631	)	$	(2,430	)	$	(342	)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Purchase and sale commitments	'
	We account for derivatives at fair value with the exception of commitments which have been designated as normal purchases and sales, for which we do not record assets or liabilities related to these agreements until the product is purchased or sold. At September 30, 2013, such commitments included the following (in thousands):
		Volume	Value
		(Barrels)
	Fixed price purchases	202	$	20,324
	Fixed price sales	330	$	34,749
	Floating price purchases	18,015	$	1,781,247
	Floating price sales	17,743	$	1,796,814

Partners_Capital_and_Distribut1

Partners' Capital and Distributions (Tables)	9 Months Ended
	Sep. 30, 2013
Partners' Capital [Abstract]	'
Changes in partners' capital	'
	The following table shows the changes in our partners’ capital accounts from December 31, 2012 to September 30, 2013 (in thousands):
		Common				Common				Subordinated			Class A Units			General			Total
		Units -				Units -				Units						Partner			Partners’
		Public				SemGroup										Interest			Capital
	Balance at December 31, 2012	$	129,134			$	37,992			$	135,036		$	—		$	6,159		$	308,321
	Net income	14,429				3,900				11,323			37			850			30,539
	Equity issuance	210,226				44,445				—			30,543			5,986			291,200
	Purchase price in excess of historical cost of interest in SemCrude Pipeline, L.L.C.	(90,516		)		(29,063		)		(84,379		)	(12,572		)	(4,418		)	(220,948		)
	Unvested distribution equivalent rights	(33		)		—				—			—			—			(33		)
	Cash distributions	(11,458		)		(3,676		)		(10,676		)	—			(642		)	(26,452		)
	Non-cash equity compensation	578				—				—			—			—			578
	Balance at September 30, 2013	$	252,360			$	53,598			$	51,304		$	18,008		$	7,935		$	383,205
Schedule of incentive distribution thresholds	'
	The following table summarizes the incentive distribution levels:
								Marginal Percentage
								Interest in Distributions
			Total Quarterly Distribution					Unitholders			General		Incentive
			Per Unit Target Amount								Partner		Distribution
											Interest		Rights
	Minimum Quarterly Distribution				$0.36			98	%		2	%	—	%
	First Target Distribution	above	$0.36		up to	$0.42		98	%		2	%	—	%
	Second Target Distribution	above	$0.42		up to	$0.45		85	%		2	%	13	%
	Third Target Distribution	above	$0.45		up to	$0.54		75	%		2	%	23	%
	Thereafter				above	$0.54		50	%		2	%	48	%
Distributions paid or declared	'
	The following table shows the cash distributions paid or declared per common limited partner unit during 2013 and 2012:
	Quarter Ended		Record Date		Payment Date		Distribution Per Unit
	31-Dec-11		3-Feb-12		13-Feb-12		$0.07	*
	31-Mar-12		7-May-12		15-May-12		$0.37
	30-Jun-12		6-Aug-12		14-Aug-12		$0.38
	30-Sep-12		5-Nov-12		14-Nov-12		$0.39
	31-Dec-12		4-Feb-13		14-Feb-13		$0.40
	31-Mar-13		6-May-13		15-May-13		$0.43
	30-Jun-13		5-Aug-13		14-Aug-13		$0.44
	30-Sep-13		5-Nov-13		14-Nov-13		$0.45
	* Calculated as the $0.3625 minimum quarterly distribution, prorated based on the length of time during the three months ended December 31, 2011, that was subsequent to our initial public offering.

Earnings_Per_Limited_Partner_U1

Earnings Per Limited Partner Unit (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Computation of basic and diluted earnings per unit	'
	The following table sets forth the computation of basic and diluted earnings per limited partner unit for the three months and nine months ended September 30, 2013 and 2012 (in thousands, except per unit data):
		Three Months Ended September 30,					Nine Months Ended September 30,
		2013			2012		2013		2012
	Net income	$	9,411		$	6,469	$	30,539	$	19,353
	Less: General partner’s incentive distribution earned (*)	127			—		239		—
	Less: General partner’s 2.0% ownership	188			129		611		387
	Net income allocated to limited partners	$	9,096		$	6,340	$	29,689	$	18,966
	Numerator for basic and diluted earnings per limited partner unit (**):
	Allocation of net income among limited partner interests:
	Net income allocable to common units	$	6,116		$	3,170	$	18,329	$	9,483
	Net income allocable to subordinated units	3,083			3,170		11,323		9,483
	Net income (loss) allocable to Class A units	(103		)	—		37		—
	Net income allocated to limited partners	$	9,096		$	6,340	$	29,689	$	18,966
	Denominator for basic and diluted earnings per limited partner unit:
	Basic weighted average number of common units outstanding	13,442			8,390		12,587		8,390
	Effect of non-vested restricted units	37			19		34		14
	Diluted weighted average number of common units outstanding	13,479			8,409		12,621		8,404
	Basic and diluted weighted average number of subordinated units outstanding	8,390			8,390		8,390		8,390
	Basic and diluted weighted average number of Class A units outstanding	1,250			—		1,200		—
	Net income per limited partner unit:
	Common units (basic)	$	0.45		$	0.38	$	1.46	$	1.13
	Common units (diluted)	$	0.45		$	0.38	$	1.45	$	1.13
	Subordinated units (basic and diluted)	$	0.37		$	0.38	$	1.35	$	1.13
	Class A units (basic and diluted)	$	(0.08	)	$	—	$	0.03	$	—

Acquisitions_Acquisitions_Deta

Acquisitions Acquisitions (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Acquisitions [Abstract]	'	'
Property, plant, and equipment, preliminary purchase price allocation	$16,690	'
Intangible assets, preliminary purchase price allocation	6,018	'
Goodwill, preliminary purchase price allocation	27,261	0
Assets acquired	$49,969	'

Acquisitions_Details_Textual

Acquisitions (Details Textual) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

Share data in Millions, except Per Share data, unless otherwise specified

Nov. 13, 2013

Sep. 30, 2013

Sep. 30, 2012

Jan. 11, 2013

Sep. 01, 2013

Sep. 30, 2013

Mar. 31, 2013

Jan. 11, 2013

Jan. 11, 2013

Jan. 11, 2013

Sep. 30, 2013

Jan. 11, 2013

Jan. 11, 2013

Aug. 14, 2013

Jan. 11, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jan. 11, 2013

Jan. 11, 2013

Nov. 11, 2013

Sep. 30, 2013

Width

Barcas Field Services, LLC [Member]

White Cliffs Pipeline L L C [Member]

SemCrude Pipeline [Member]

Common Class A [Member]

Common Units [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Limited Partner [Member]

Limited Partner [Member]

General Partner [Member]

General Partner [Member]

White Cliffs Pipeline L L C [Member]

White Cliffs Pipeline L L C [Member]

White Cliffs Pipeline L L C [Member]

SemCrude Pipeline [Member]

SemCrude Pipeline [Member]

Private Placement [Member]

SemCrude Pipeline [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Trailers

mi

Common Class A [Member]

Common Units [Member]

SemCrude Pipeline [Member]

SemCrude Pipeline [Member]

Common Units [Member]

Line of Credit [Member]

Tampa Pipeline [Member]

Tampa Pipeline [Member]

Trucks

bbl

mi

Width

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax amortization period for goodwill

'

'15 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited partner units issued in acquisition

'

'

'

'

'

'

'

1.25

1.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unit price

'

$31.95

'

'

'

'

'

'

$29.63

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Value of common units issued as consideration

'

'

'

'

'

'

'

'

'

'

'

$30,500,000

$44,400,000

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of common limited partners units

152,500,000

210,226,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

59,300,000

'

'

'

Contribution from partner

'

'

'

'

'

'

'

'

'

'

'

'

'

3,200,000

2,700,000

'

'

'

12,000,000

31,800,000

'

'

'

'

Transaction related costs

'

3,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited partner unit issuance costs

'

1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt issuance cost

'

'

'

'

'

'

'

'

'

'

1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition related expenses

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average daily throughput threshold in barrels for conversion of Class A units

'

'

'

'

'

125,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity method investment, ownership percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

51.00%

51.00%

33.00%

33.00%

'

'

'

'

Payments to acquire equity method investments

'

78,156,000

0

'

'

'

189,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Width of pipeline in inches

'

12

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

12

Effective ownership interest in equity method investee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17.00%

'

'

'

'

'

'

'

'

Expected Capital Funding Requirement Year Two

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,800,000

17,800,000

'

'

'

'

Length Of Pipeline Network

'

'

'

'

'

527

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12

Proceeds from Lines of Credit

'

'

'

'

'

'

'

'

'

133,500,000

'

'

'

'

'

'

'

'

'

'

'

130,300,000

'

'

Common units sold in private placement

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Days Following the Closing of the Private Placement Required to Prepare Registration Statement

'

'

'

'30 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Businesses, Net of Cash Acquired

'

49,969,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,300,000

'

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net

'

$49,969,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Trucks purchased

'

'

'

'

114

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Trailers purchased

'

'

'

'

120

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment_in_nonconsolidated_2

Investment in non-consolidated affiliate Investment in non-consolidated affiliate (Details) (White Cliffs Pipeline L L C [Member], USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
White Cliffs Pipeline L L C [Member]	'	'
Equity Method Investment, Summarized Financial Information, Revenue	$31,453	$92,238
Equity Method Investment, Summarized Financial Information, Operating, General and Administrative Expenses	5,141	14,433
Equity Method Investment, Summarized Financial Information, Depreciation and Amortization Expense	4,720	14,150
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$21,579	$63,642

Investment_in_nonconsolidated_3

Investment in non-consolidated affiliate Investment in non-consolidated affiliate (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings from equity method investment	$3,527,000	$0	$10,431,000	$0
General and Administrative Expense	3,146,000	4,081,000	9,961,000	8,830,000
SemCrude Pipeline [Member]	'	'	'	'
Equity method investment, ownership percentage	33.00%	'	33.00%	'
Earnings from equity method investment	3,500,000	'	10,400,000	'
Distributions from equity investment	4,100,000	'	11,100,000	'
White Cliffs Pipeline L L C [Member]	'	'	'	'
Effective ownership interest in equity method investee	17.00%	'	17.00%	'
White Cliffs Pipeline L L C [Member] | SemCrude Pipeline [Member]	'	'	'	'
Equity method investment, ownership percentage	51.00%	'	51.00%	'
SemCrude Pipeline [Member] | White Cliffs Pipeline L L C [Member]	'	'	'	'
Equity method investment, ownership percentage	51.00%	'	51.00%	'
White Cliffs Pipeline L L C [Member]	'	'	'	'
General and Administrative Expense	$500,000	'	$1,200,000	'

Financial_Instruments_Details

Financial Instruments (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Summarized balance of assets and liabilities	'		'
Assets	$725		$0
Liabilities	0		1,034
Net assets (liabilities) at fair value	725		-1,034
Level 1 [Member]	'		'
Summarized balance of assets and liabilities	'		'
Assets	857		22
Liabilities	132		1,056
Net assets (liabilities) at fair value	725		-1,034
Netting [Member]	'		'
Summarized balance of assets and liabilities	'		'
Assets	-132		-22
Liabilities	-132		-22
Net assets (liabilities) at fair value	$0	[1]	$0	[1]
[1]	* Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange

Financial_Instruments_Details_

Financial Instruments (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Level 2 and level 3 fair value transactions	$0

Financial_Instruments_Details_1

Financial Instruments (Details 2)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	bbl	bbl	bbl	bbl
Purchases [Member]	'	'	'	'
Derivative, Nonmonetary Notional Amount, Volume	805,000	380,000	2,095,000	1,066,000
Sales [Member]	'	'	'	'
Derivative, Nonmonetary Notional Amount, Volume	695,000	470,000	2,025,000	1,153,000

Financial_Instruments_Details_2

Financial Instruments (Details 3) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair value of commodity derivative assets and liabilities	'	'
Assets	$725	$0
Liabilities	0	1,034
Commodity Contract [Member] | Assets [Member]	'	'
Fair value of commodity derivative assets and liabilities	'	'
Assets	725	0
Commodity Contract [Member] | Liabilities [Member]	'	'
Fair value of commodity derivative assets and liabilities	'	'
Liabilities	$0	$1,034

Financial_Instruments_Details_3

Financial Instruments (Details 4) (Commodity Contract [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commodity Contract [Member]	'	'	'	'
Realized and unrealized gains (losses) from commodity derivatives	'	'	'	'
Commodity contracts	($1,652)	($631)	($2,430)	($342)

Financial_Instruments_Financia1

Financial Instruments Financial Instruments (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Level 2 and level 3 fair value transactions	$0	'
Margin Deposit Assets	-100,000	1,900,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	$600,000	$900,000

Long_Term_Debt_Details

Long Term Debt (Details) (USD $)	0 Months Ended	9 Months Ended
	Jan. 11, 2013	Sep. 30, 2013
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Maximum Borrowing Incremental Increases	'	$200,000,000
Unamortized capitalized loan costs	'	3,700,000
Noncurrent Capital Lease Obligations	'	43,000
Capital lease obligations	'	69,000
Secured Bilateral [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding letters of credit	'	7,600,000
Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Debt issuance cost	'	1,600,000
Outstanding borrowings	'	85,000,000
Credit facility capacity, current	'	385,000,000
Proceeds from Lines of Credit	133,500,000	'
Revolving Credit Facility [Member] | Maximum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Commitment fee on unused capacity	'	0.50%
Revolving Credit Facility [Member] | Minimum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Commitment fee on unused capacity	'	0.38%
1.75% Letter of Credit [Member] | Secured Bilateral [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding letters of credit	'	600,000
Rate of outstanding letter of credit	'	1.75%
2.0% Letter of Credit [Member] | Secured Bilateral [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding letters of credit	'	7,000,000
Rate of outstanding letter of credit	'	2.00%
Alternate Base Rate Borrowings [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding borrowings	'	55,000,000
Rate of outstanding letter of credit	'	4.50%
Eurodollar Rate Borrowings [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding borrowings	'	30,000,000
Rate of outstanding letter of credit	'	2.53%
Letter of Credit [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding letters of credit	'	31,800,000
Rate of outstanding letter of credit	'	2.25%
Fronting fee on outstanding letter of credit	'	0.25%
Debt issuance [Member] | Subordinated Debt [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Minimum aggregate issuance to elect alternative financial covenants	'	$200,000,000
SemCrude Pipeline [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Equity method investment, ownership percentage	'	33.00%

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified	bbl
Floating Price Sales [Member]	'
Purchase and sale commitments	'
Sales Commitment Amount	$1,796,814
Sales Commitment Value	17,743,000
Fixed Price Sales [Member]	'
Purchase and sale commitments	'
Sales Commitment Amount	34,749
Sales Commitment Value	330,000
Fixed Price Purchases [Member]	'
Purchase and sale commitments	'
Purchase Commitment Volume	202,000
Purchase Commitment Amount	20,324
Floating Price Purchases [Member]	'
Purchase and sale commitments	'
Purchase Commitment Volume	18,015,000
Purchase Commitment Amount	$1,781,247

Commitments_and_Contingencies_2

Commitments and Contingencies (Details Textual)	9 Months Ended
	Sep. 30, 2013	Aug. 18, 2011
	Number_Of_Sites	bbl
Commitments and Contingencies (Textual) [Abstract]	'	'
Legal proceedings number of sites	5	'
Number of sites with less soil contamination	3	'
Number of sites with ground water contamination	3	'
Barrels of crude oil claimed to be owed	'	141,000
Minimum [Member]	'	'
Supply Commitment [Line Items]	'	'
Period of agreement notice	'30 days	'
Maximum [Member]	'	'
Supply Commitment [Line Items]	'	'
Period of agreement notice	'120 days	'

Partners_Capital_and_Distribut2

Partners' Capital and Distributions (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	$308,321,000	'
Net income	9,411,000	6,469,000	30,539,000	19,353,000
Proceeds from Issuance of Common Limited Partners Units	'	'	291,200,000	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-220,948,000	'
Unvested Unit Distributions Value	'	'	-33,000	'
Distributions	'	'	-26,452,000	'
Partners' Capital Account, Unit-based Compensation	'	'	578,000	'
Ending Balance	383,205,000	'	383,205,000	'
Class A units [Member]	'	'	'	'
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	0	'
Net income	'	'	37,000	'
Proceeds from Issuance of Common Limited Partners Units	'	'	30,543,000	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-12,572,000	'
Unvested Unit Distributions Value	'	'	0	'
Distributions	'	'	0	'
Partners' Capital Account, Unit-based Compensation	'	'	0	'
Ending Balance	18,008,000	'	18,008,000	'
Common Units - Public [Member]	'	'	'	'
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	129,134,000	'
Net income	'	'	14,429,000	'
Proceeds from Issuance of Common Limited Partners Units	'	'	210,226,000	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-90,516,000	'
Unvested Unit Distributions Value	'	'	-33,000	'
Distributions	'	'	-11,458,000	'
Partners' Capital Account, Unit-based Compensation	'	'	578,000	'
Ending Balance	252,360,000	'	252,360,000	'
Common Units - SemGroup [Member]	'	'	'	'
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	37,992,000	'
Net income	'	'	3,900,000	'
Proceeds from Issuance of Common Limited Partners Units	'	'	44,445,000	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-29,063,000	'
Unvested Unit Distributions Value	'	'	0	'
Distributions	'	'	-3,676,000	'
Partners' Capital Account, Unit-based Compensation	'	'	0	'
Ending Balance	53,598,000	'	53,598,000	'
Subordinated Units [Member]	'	'	'	'
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	135,036,000	'
Net income	'	'	11,323,000	'
Proceeds from Issuance of Common Limited Partners Units	'	'	0	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-84,379,000	'
Unvested Unit Distributions Value	'	'	0	'
Distributions	'	'	-10,676,000	'
Partners' Capital Account, Unit-based Compensation	'	'	0	'
Ending Balance	51,304,000	'	51,304,000	'
General Partner Interest [Member]	'	'	'	'
Increase (Decrease) in Partners' Capital	'	'	'	'
Beginning Balance	'	'	6,159,000	'
Net income	'	'	850,000	'
Proceeds from Issuance of Common Limited Partners Units	'	'	5,986,000	'
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	'	'	-4,418,000	'
Unvested Unit Distributions Value	'	'	0	'
Distributions	'	'	-642,000	'
Partners' Capital Account, Unit-based Compensation	'	'	0	'
Ending Balance	$7,935,000	'	$7,935,000	'

Partners_Capital_and_Distribut3

Partners' Capital and Distributions (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2013
Minimum Quarterly Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.3625
First Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.3625
Maximum [Member] | First Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.416875
Maximum [Member] | Second Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.453125
Maximum [Member] | Third Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.54375
Minimum [Member] | Minimum Quarterly Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.3625
Minimum [Member] | First Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.3625
Minimum [Member] | Second Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.416875
Minimum [Member] | Third Target Distribution [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.453125
Minimum [Member] | Thereafter [Member]	'
Incentive distribution thresholds	'
Total quarterly distribution per unit target amount (in dollars per share)	0.54375
Unitholders [Member] | Minimum Quarterly Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	98.00%
Unitholders [Member] | First Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	98.00%
Unitholders [Member] | Second Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	85.00%
Unitholders [Member] | Third Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	75.00%
Unitholders [Member] | Thereafter [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	50.00%
General Partner Interest [Member] | Minimum Quarterly Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | First Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Second Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Third Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Thereafter [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	2.00%
Incentive Distribution Rights [Member] | Minimum Quarterly Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	0.00%
Incentive Distribution Rights [Member] | First Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	0.00%
Incentive Distribution Rights [Member] | Second Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	13.00%
Incentive Distribution Rights [Member] | Third Target Distribution [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	23.00%
Incentive Distribution Rights [Member] | Thereafter [Member]	'
Incentive distribution thresholds	'
Marginal percentage interest in distributions	48.00%

Partners_Capital_and_Distribut4

Partners' Capital and Distributions Partners' Capital and Distributions (Details 2) (USD $)

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

9 Months Ended

Nov. 14, 2013

Sep. 30, 2013

15-May-13

Sep. 30, 2013

Feb. 14, 2013

Sep. 30, 2013

15-May-12

Sep. 30, 2012

Aug. 14, 2013

Sep. 30, 2013

Nov. 14, 2012

Sep. 30, 2012

Feb. 13, 2012

Dec. 31, 2011

Aug. 14, 2012

Sep. 30, 2012

Sep. 30, 2013

Distribution of Q3 2013 earnings [Member]

Distribution of Q3 2013 earnings [Member]

Distribution of Q1 2013 earnings [Member]

Distribution of Q1 2013 earnings [Member]

Distribution of Q4 2012 earnings [Member]

Distribution of Q4 2012 earnings [Member]

Distribution of Q1 2012 earnings [Member]

Distribution of Q1 2012 earnings [Member]

Distribution of Q2 2013 earnings [Member]

Distribution of Q2 2013 earnings [Member]

Distribution of Q3 2012 earnings [Member]

Distribution of Q3 2012 earnings [Member]

Distribution of Q4 2011 earnings (pro-rated) [Member]

Distribution of Q4 2011 earnings (pro-rated) [Member]

Distribution of Q2 2012 earnings [Member]

Distribution of Q2 2012 earnings [Member]

Minimum Quarterly Distribution [Member]

Distribution Made to Member or Limited Partner [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution payment date

'

14-Nov-13

'

15-May-13

'

14-Feb-13

'

15-May-12

'

14-Aug-13

'

14-Nov-12

'

13-Feb-12

'

14-Aug-12

'

Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit

'

'

$0.43

'

$0.40

'

$0.37

'

$0.44

'

$0.39

'

$0.07

[1]

'

$0.38

'

'

Minimum Quarterly Distribution Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.36

Distribution Made to Member or Limited Partner, Date of Record

'

5-Nov-13

'

6-May-13

'

4-Feb-13

'

7-May-12

'

5-Aug-13

'

5-Nov-12

'

3-Feb-12

'

6-Aug-12

'

Distribution Made to Limited Partner, Distributions Declared, Per Unit

$0.45

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

* Calculated as the $0.3625 minimum quarterly distribution, prorated based on the length of time during the three months ended DecemberB 31, 2011, that was subsequent to our initial public offering.

Partners_Capital_and_Distribut5

Partners' Capital and Distributions (Details Textual) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

Nov. 13, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Aug. 13, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Aug. 14, 2013

Jan. 11, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

UnitAwards

UnitAwards

Employee [Member]

Non-managerial directors [Member]

Minimum Quarterly Distribution [Member]

First Target Distribution [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

General Partner Interest [Member]

General Partner Interest [Member]

General Partner Interest [Member]

General Partner Interest [Member]

General Partner Interest [Member]

General Partner Interest [Member]

General Partner Interest [Member]

Subordinated Unitholders [Member]

Incentive Distribution Rights [Member]

Incentive Distribution Rights [Member]

Incentive Distribution Rights [Member]

Incentive Distribution Rights [Member]

Incentive Distribution Rights [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum Quarterly Distribution [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Thereafter [Member]

Minimum Quarterly Distribution [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Thereafter [Member]

Minimum Quarterly Distribution [Member]

Minimum Quarterly Distribution [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Thereafter [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Minimum Quarterly Distribution [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Thereafter [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period

'

'

3,872

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total quarterly distribution per unit target amount (in dollars per share)

'

'

'

'

'

'

'

$0.36

$0.36

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.42

$0.45

$0.54

$0.36

$0.36

$0.42

$0.45

$0.54

Marginal percentage interest in distributions

'

'

'

'

'

'

'

'

'

'

98.00%

98.00%

85.00%

75.00%

50.00%

'

'

2.00%

2.00%

2.00%

2.00%

2.00%

98.00%

0.00%

0.00%

13.00%

23.00%

48.00%

'

'

'

'

'

'

'

'

Vesting period

'

'

'

'

'

'3 years

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued based on unit distribution rights vested during period

'

'

140

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Units reserved for equity incentive plans

'

840,000

840,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested restricted unit awards

'

43,392

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested unit distributions value

'

$93,000

$93,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested unit distributions, equivalent number of units

'

2,904

2,904

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested unit distributions per unit (in dollars per unit)

'

$31.95

$31.95

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

$34.22

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested share-based payment awards outstanding

'

83,620

83,620

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, New Issues

'

'

'

'

'

'

'

'

'

4,750,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of common limited partners units

152,500,000

'

210,226,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Offering Costs, Partnership Interests

'

'

'

'

6,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,200,000

$2,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest

'

'

2.00%

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings_Per_Limited_Partner_U2

Earnings Per Limited Partner Unit (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Earnings Per Share [Abstract]	'		'		'		'
Net income	$9,411		$6,469		$30,539		$19,353
Less: General partner's incentive distribution earned	127		0	[1]	239		0	[1]
Less: General partner's 2.0% ownership	188		129		611		387
Net income allocated to limited partners	9,096	[2]	6,340	[2]	29,689	[2]	18,966	[2]
Common Class A [Member]	'		'		'		'
Earnings Per Share [Abstract]	'		'		'		'
Net income allocated to limited partners	-103		0		37		0
Denominator for basic and diluted earnings per limited partner unit:	'		'		'		'
Basic weighted average number of limited partner units outstanding	1,250,000		0		1,200,000		0
Diluted weighted average number of limited partner common units outstanding	1,250,000		0		1,200,000		0
Basic & diluted net income per limited partner unit:	'		'		'		'
Limited partner units	($0.08)		$0		$0.03		$0
Common Units [Member]	'		'		'		'
Earnings Per Share [Abstract]	'		'		'		'
Net income allocated to limited partners	6,116		3,170		18,329		9,483
Denominator for basic and diluted earnings per limited partner unit:	'		'		'		'
Basic weighted average number of limited partner units outstanding	13,442,000		8,390,000		12,587,000		8,390,000
Effect of non-vested restricted units	37,000		19,000		34,000		14,000
Diluted weighted average number of limited partner common units outstanding	13,479,000		8,409,000		12,621,000		8,404,000
Basic & diluted net income per limited partner unit:	'		'		'		'
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$0.45		$0.38		$1.46		$1.13
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	$0.45		$0.38		$1.45		$1.13
Subordinated Units [Member]	'		'		'		'
Earnings Per Share [Abstract]	'		'		'		'
Net income allocated to limited partners	$3,083		$3,170		$11,323		$9,483
Denominator for basic and diluted earnings per limited partner unit:	'		'		'		'
Basic weighted average number of limited partner units outstanding	8,390,000		8,390,000		8,390,000		8,390,000
Diluted weighted average number of limited partner common units outstanding	8,390,000		8,390,000		8,390,000		8,390,000
Basic & diluted net income per limited partner unit:	'		'		'		'
Limited partner units	$0.37		$0.38		$1.35		$1.13
[1]	(*) Based on the amount of the distribution declared per common and subordinated unit related to earnings for the three months and nine months ended SeptemberB 30, 2012, our general partner was not entitled to receive incentive distributions for those periods.
[2]	(**) We calculate net income allocated to limited partners based on the distributions pertaining to the current periodbs available cash as defined by our partnership agreement. After adjusting for the appropriate periodbs distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner, limited partners and participating securities in accordance with the contractual terms of the partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings. Class A units do not participate in cash distributions, but are allocated a proportional share of undistributed earnings.

Earnings_Per_Limited_Partner_U3

Earnings Per Limited Partner Unit (Details Textual)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Limited Partner Unit (Textual) [Abstract]	'	'
Percentage of ownership general partner interest	2.00%	2.00%

Related_Party_Transactions_Det

Related Party Transactions (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
General Partner [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Direct employee expenses	$2,300,000	$2,900,000	$8,300,000	$8,900,000
Allocated expenses	1,600,000	2,800,000	4,600,000	4,800,000
NGL Energy [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Purchases	8,000,000	10,900,000	8,000,000	36,600,000
Related Party Reimbursement of Expense from a Related Party Transaction	56,000	'	140,000	0
High Sierra Crude Oil and Marketing, LLC [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Revenue from related parties	15,700,000	12,400,000	68,600,000	23,400,000
Purchases	6,500,000	16,300,000	34,700,000	32,200,000
Sem Gas [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Purchases	6,600,000	2,300,000	15,700,000	7,500,000
White Cliffs Pipeline L L C [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Revenue from related parties	800,000	600,000	2,100,000	1,800,000
Conner & Winters LLP [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Legal Fees	$100,000	$100,000	$400,000	$400,000
White Cliffs Pipeline L L C [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Effective ownership interest in equity method investee	17.00%	'	17.00%	'
SemCrude Pipeline [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Equity method investment, ownership percentage	33.00%	'	33.00%	'
SemCrude Pipeline [Member] | White Cliffs Pipeline L L C [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Equity method investment, ownership percentage	51.00%	'	51.00%	'

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information Supplemental Cash Flow Information (Details Textual) (USD $)	9 Months Ended			3 Months Ended	9 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jan. 11, 2013	Sep. 30, 2013	Sep. 30, 2013	Jan. 11, 2013	Jan. 11, 2013	Jan. 11, 2013	Jan. 11, 2013	Aug. 14, 2013	Jan. 11, 2013
				SemCrude Pipeline [Member]	SemCrude Pipeline [Member]	Common Units [Member]	Common Class A [Member]	Limited Partner [Member]	Limited Partner [Member]	General Partner [Member]	General Partner [Member]
								Common Units [Member]	Common Class A [Member]
Other Significant Noncash Transactions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Equity method investment, ownership percentage	'	'	'	33.00%	33.00%	'	'	'	'	'	'
Limited partner units issued in acquisition	'	'	'	'	'	1.5	1.25	'	'	'	'
Partners' Capital Account, Acquisitions	'	'	'	'	'	'	'	$44.40	$30.50	'	'
Partners' Capital Account, Contributions	'	'	'	12	31.8	'	'	'	'	3.2	2.7
Purchase price in excess of historical cost	'	'	221	'	'	'	'	'	'	'	'
Cash consideration in excess of historical cost	'	'	143.2	'	'	'	'	'	'	'	'
Non-cash purchase price in excess of historical cost	'	'	77.8	'	'	'	'	'	'	'	'
Interest Paid	5	0.8	'	'	'	'	'	'	'	'	'
Capital Expenditures Incurred but Not yet Paid	$0	$1.50	'	'	'	'	'	'	'	'	'