Rose Rock Midstream 8-K 11 May 15 Other Events Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2014
Document Type	8-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Entity Registrant Name	Rose Rock Midstream, L.P.
Entity Central Index Key	1527622

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$3,625	$15,437
Accounts receivable	224,881	217,583
Receivable from affiliates	15,485	56,220
Inventories	26,722	30,779
Other current assets	4,056	1,917
Total current assets	274,769	321,936
Property, plant and equipment, net	396,066	351,156
Equity method investment	269,635	224,095
Goodwill	36,116	28,322
Other intangible assets (net of accumulated amortization of $370 and $1,155 at December 31, 2014 and 2013, respectively)	16,640	5,775
Other noncurrent assets, net	13,037	5,852
Total assets	1,006,263	937,136
Current liabilities:
Accounts payable	211,300	212,449
Payable to affiliates	27,909	69,368
Accrued liabilities	23,282	10,151
Other current liabilities	3,191	3,814
Total current liabilities	265,682	295,782
Long-term debt	432,092	245,088
Commitments and contingencies (Note 9)
Partners’ capital:
General partner	67,632	43,133
Total Rose Rock Midstream, L.P. partners’ capital	308,489	317,709
Noncontrolling interests in consolidated subsidiaries	0	78,557
Total equity	308,489	396,266
Total liabilities and partners’ capital	1,006,263	937,136
Capital Unit, Class A [Member] | SemGroup [Member]
Partners’ capital:
Common units	76,321	40,772
Common Units [Member] | Public [Member]
Partners’ capital:
Common units	69,929	159,961
Common Units [Member] | SemGroup [Member]
Partners’ capital:
Common units	155,367	79,218
Subordinated Units [Member] | SemGroup [Member]
Partners’ capital:
Common units	($60,760)	($5,375)

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Finite-Lived Intangible Assets, Accumulated Amortization	$370	$1,155
Subordinated Units [Member] | SemGroup [Member]
Common units, issued	8,389,709	8,389,709
Common units, outstanding	8,389,709	8,389,709
Common Class A [Member] | SemGroup [Member]
Common units, issued	3,750,000	2,500,000
Common units, outstanding	3,750,000	2,500,000
Common Units [Member] | Public [Member]
Common units, issued	13,765,451	13,759,739
Common units, outstanding	13,765,451	13,759,739
Common Units [Member] | SemGroup [Member]
Common units, issued	6,814,709	4,389,709
Common units, outstanding	6,814,709	4,389,709

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues, including revenues from affiliates (Note 14):
Product	$1,185,456,000		$702,028,000		$576,158,000
Service	112,641,000		65,174,000		44,318,000
Other	0		0		-59,000
Total revenues	1,298,097,000		767,202,000		620,417,000
Expenses, including expenses from affiliates (Note 14):
Costs of products sold, exclusive of depreciation and amortization	1,131,362,000		663,759,000		546,966,000
Operating	80,479,000		36,067,000		23,302,000
General and administrative	19,415,000		15,557,000		12,083,000
Depreciation and amortization	40,035,000		23,708,000		12,131,000
Total expenses	1,271,291,000		739,091,000		594,482,000
Earnings from equity method investment	57,378,000		17,571,000		0
Operating income	84,184,000		45,682,000		25,935,000
Other expenses (income):
Interest expense	21,279,000		8,181,000		1,912,000
Other expense (income), net	-20,000		-14,000		69,000
Total other expenses (income), net	21,259,000		8,167,000		1,981,000
Net income	62,925,000		37,515,000		23,954,000
Less: net income attributable to noncontrolling interests	7,758,000		1,256,000		0
Net income attributable to Rose Rock Midstream, L.P.	55,167,000		36,259,000		23,954,000
Earnings per limited partner unit
Net income allocated to general partner	8,142,000		728,000		479,000
Net income (loss) allocated to limited partners	47,025,000	[1]	35,531,000	[1]	23,475,000	[1]
Common Units [Member]
Earnings per limited partner unit
Net income (loss) allocated to limited partners	32,914,000		22,701,000		11,737,500
Earnings per limited partner unit, basic	$1.69		$1.66		$1.40
Earnings per limited partner unit, diluted	$1.69		$1.66		$1.40
Basic weighted average number of limited partner units outstanding:
Basic weighted average number of limited partner units outstanding:	19,419		13,672		8,390
Diluted weighted average number of limited partner units outstanding:
Diluted weighted average number of limited partner units outstanding:	19,484		13,708		8,406
Subordinated Units [Member]
Earnings per limited partner unit
Net income (loss) allocated to limited partners	13,912,000		13,321,000		11,737,500
Subordinated Units [Member]
Earnings per limited partner unit
Net income (loss) allocated to limited partners	13,912,000		13,321,000		11,737,500
Earnings per limited partner unit, basic and diluted	$1.66		$1.59		$1.40
Basic weighted average number of limited partner units outstanding:
Basic weighted average number of limited partner units outstanding:	8,390		8,390		8,390
Diluted weighted average number of limited partner units outstanding:
Diluted weighted average number of limited partner units outstanding:	8,390		8,390		8,390
Common Class A [Member]
Earnings per limited partner unit
Net income (loss) allocated to limited partners	$199,000		($491,000)		$0
Earnings per limited partner unit, basic and diluted	$0.06		($0.39)		$0
Basic weighted average number of limited partner units outstanding:
Basic weighted average number of limited partner units outstanding:	3,154		1,264		0
Diluted weighted average number of limited partner units outstanding:
Diluted weighted average number of limited partner units outstanding:	3,154		1,264		0
[1]	(**) 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. Prior to the conversion of the Class A units in January 2015, the Class A units did not participate in cash distributions, but were allocated a proportional share of undistributed earnings. Class A units will receive the declared distribution for the fourth quarter of 2014, as such the fourth quarter distribution is reflected in the earnings attributable to Class A units for the year ended December 31, 2014. As distributions related to the available cash exceeded net income, the Class A units reflect a loss for the year ended December 31, 2013.

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)	Total	Common Units Public [Member]	Common Units SemGroup [Member]	Subordinated Units [Member]	Class A unitholder [Member]	General Partner [Member]	Noncontrolling Interest [Member]
In Thousands, unless otherwise specified
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2011	$304,854	$127,531	$37,739	$133,487	$0	$6,097	$0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	23,954	9,797	1,940	11,738	0	479	0
Cash distributions to Partners	-20,795	-8,502	-1,687	-10,189	0	-417	0
Contributions to general partners account	12,230	0	0	0	0	12,230	0
Non-cash equity compensation	308	308	0	0	0	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2012	320,551	129,134	37,992	135,036	0	18,389	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	37,515	17,710	4,991	13,321	-491	728	1,256
Consolidation of SemCrude Pipeline	77,301	0	0	0	0	0	77,301
Cash distributions to Partners	-38,076	-17,647	-4,977	-14,451	0	-1,001	0
Contributions to general partners account	25,398	0	0	0	0	25,398	0
Non-cash equity compensation	806	806	0	0	0	0	0
Equity issuance	387,131	210,226	98,895	0	70,105	7,905	0
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	-414,308	-180,216	-57,683	-139,281	-28,842	-8,286	0
Unvested distribution equivalent rights	-52	-52	0	0	0	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2013	396,266	159,961	79,218	-5,375	40,772	43,133	78,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	62,925	22,817	10,097	13,912	199	8,142	7,758
Cash distributions to Partners	-62,339	-28,494	-11,778	-17,366	0	-4,701	0
Contributions to general partners account	21,547	0	0	0	0	21,547	0
Non-cash equity compensation	943	943	0	0	0	0	0
Equity issuance	182,220	0	120,013	0	58,563	3,644	0
Purchase price in excess of historical cost in common control transaction, including non-cash consideration	-206,633	-85,173	-42,183	-51,931	-23,213	-4,133	0
Unvested distribution equivalent rights	-125	-125	0	0	0	0	0
Cash distributions to noncontrolling interest in SemCrude Pipeline, L.L.C.	-10,683	0	0	0	0	0	-10,683
Contributions from noncontrolling interest in SemCrude Pipeline, L.L.C.	14,367	0	0	0	0	0	14,367
Purchase of remaining one-third interest in SemCrude Pipeline, L.L.C.	-89,999	0	0	0	0	0	-89,999
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014	$308,489	$69,929	$155,367	($60,760)	$76,321	$67,632	$0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$62,925	$37,515	$23,954
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,035	23,708	12,131
Loss (gain) on disposal of long-lived assets, net	319	-31	-1
Earnings from equity method investment	-57,378	-17,571	0
Distributions from equity method investment	57,378	16,999	0
Amortization of debt issuance costs	1,529	811	359
Non-cash equity compensation	943	806	308
Net unrealized (gain) loss related to derivative instruments	-1,621	-974	1,196
Inventory Write-down	5,667	0	0
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	-7,298	13,179	-91,207
Decrease (increase) in receivable from affiliates	40,735	-56,163	2,153
Decrease (increase) in inventories	-1,610	-7,465	-3,251
Decrease (increase) in other current assets	-461	832	-1,707
Decrease (increase) in other assets	-120	-7	-20
Increase (decrease) in accounts payable and accrued liabilities	11,623	-4,963	96,537
Increase (decrease) in payable to affiliates	-41,573	66,716	-5,339
Net cash provided by operating activities	111,093	73,392	35,113
Cash flows from investing activities:
Capital expenditures	-61,282	-51,560	-40,616
Proceeds from sale of long-lived assets	1,063	38	244
Contributions to equity method investment	-54,930	-31,832	0
Acquisitions	-133,993	-171,258	0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	9,390	0	0
Net cash used in investing activities	-239,752	-254,612	-40,372
Cash flows from financing activities:
Debt issuance costs	-8,593	-4,069	-252
Borrowings on revolving credit facility and issuance of senior unsecured notes	844,415	558,000	91,000
Principal payments on revolving credit facility	-657,415	-317,500	-86,525
Principal payments on capital lease obligations	-39	-27	0
Proceeds from common L.P. unit issuance, net of offering costs	0	210,226	0
Contributions from general partner	21,547	28,640	12,230
Cash consideration in excess of historical cost of interest in SemCrude Pipeline, L.L.C.	-24,413	-240,645	0
Net distributions to partners	-62,339	-38,076	-20,795
Payments of Ordinary Dividends, Noncontrolling Interest	-10,683	0	0
Proceeds from Noncontrolling Interests	14,367	0	0
Net cash used in financing activities	116,847	196,549	-4,342
Net increase (decrease) in cash and cash equivalents	-11,812	15,329	-9,601
Cash and cash equivalents at beginning of period	15,437	108	9,709
Cash and cash equivalents at end of period	$3,625	$15,437	$108

Overview

Overview	12 Months Ended
	Dec. 31, 2014
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.
	The terms “we”, “our”, “us”, “Rose Rock”, the “Partnership” and similar language used in these notes to the consolidated financial statements refer to Rose Rock Midstream, L.P and its subsidiaries. The term “SemGroup” refers to SemGroup Corporation and its controlled subsidiaries, including Rose Rock Midstream GP, LLC.
	Rose Rock's assets include the following:
	•	approximately 7.6 million barrels of crude oil storage capacity in Cushing, Oklahoma;
	•	a 570-mile crude oil gathering and transportation pipeline system with over 630,000 barrels of associated storage capacity in Kansas and northern Oklahoma that is connected to several third-party pipelines and refineries and our storage terminal in Cushing;
	•	a crude oil gathering, storage, transportation and marketing business in the Bakken Shale in North Dakota and Montana;
	•	a 17-mile crude oil pipeline that connects our Platteville, Colorado crude oil terminal to the Tampa, Colorado crude oil market;
	•	a crude oil trucking fleet of over 255 transport trucks and 275 trailers;
	•	a 51% interest in White Cliffs, L.L.C. ("White Cliffs"), who owns a pipeline system that runs 527 miles and consists of two 12-inch common carrier, crude oil pipelines that transport crude oil from Platteville, Colorado in the DJ Basin to Cushing, Oklahoma (the "White Cliffs Pipeline");
	•	a modern, 16-lane crude oil truck unloading facility with 230,000 barrels of associated storage capacity in Platteville, Colorado which connects to the origination point of the White Cliffs Pipeline; and
	•	the Wattenberg Oil Trunkline ("WOT"), a 75-mile, 12-inch diameter crude oil gathering pipeline system that transports crude oil from production facilities in the DJ Basin to the White Cliffs Pipeline.
	Basis of presentation
	These consolidated financial statements include the accounts of Rose Rock and its controlled subsidiaries and have been revised to reflect the impact of a common control acquisition. On February 13, 2015, we completed the acquisition of the WOT and a 50% interest in Glass Mountain Pipeline, LLC from SemGroup (Note 3). The acquisition of WOT created a change in reporting entity, which required our historical results to be revised as if WOT had been part of Rose Rock in prior periods. The accompanying historical financial statements and related notes to the consolidated financial statements have been revised to reflect this change. Prior period earnings of WOT have been allocated to the general partner. Thus, there is no change in the total amount of historical earnings attributed to common unitholders.
	These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States. All significant transactions between Rose Rock and its consolidated subsidiaries have been eliminated. Our ownership interest in White Cliffs is reflected as an equity method investment as the other owners have substantive rights to participate in the management of White Cliffs.
	Ownership
	Our partnership interests include the following at December 31, 2014:
	•	20,580,160 common units representing limited partner interests (of which 6,814,709 units are held by SemGroup);
	•	8,389,709 subordinated units representing limited partner interests (all of which are held by SemGroup);
	•	3,750,000 Class A units representing limited partner interests (all of which are held by SemGroup), which did not participate in cash distributions until conversion to common units in January 2015; and
	•	a 2% general partner interest (which is held by SemGroup).

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	USE OF ESTIMATES – 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. Our significant estimates include, but are not limited to: (1) allowances for doubtful accounts receivable; (2) estimated useful lives of assets, which impacts depreciation; (3) estimated fair values of long-lived assets used in impairment tests; (4) fair values of derivative instruments; (5) valuation of goodwill and other intangible assets; and (6) accrual and disclosure of contingent losses. Although management believes these estimates are reasonable, actual results could differ materially from these estimates.
	CASH AND CASH EQUIVALENTS—Cash includes currency on hand and demand and time deposits with banks or other financial institutions. Cash equivalents include highly liquid investments with maturities of three months or less at the date of purchase. Balances at financial institutions may exceed federally insured limits.
	ACCOUNTS RECEIVABLE – Accounts receivable are reported net of the allowance for doubtful accounts. Our assessment of the allowance for doubtful accounts is based on several factors, including the overall creditworthiness of our customers, existing economic conditions, and the amount and age of past due accounts. We enter into netting arrangements with certain counterparties to help mitigate credit risk. Receivables subject to netting are presented as gross receivables (with the related accounts payable also presented gross) until such time as the balances are settled. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are written off against the allowance for doubtful accounts only after all collection attempts have been exhausted. The allowance for doubtful accounts was $0 at December 31, 2014 and 2013.
	INVENTORIES – Inventories primarily consist of crude oil. Inventories are valued at the lower of cost or market, with cost generally determined using the weighted-average method. The cost of inventory includes applicable transportation costs. During the year ended December 31, 2014, we recorded non-cash charges of $5.7 million to write-down inventory to the lower of cost or market.
	We enter into exchanges with third parties whereby we acquire products that differ in location, grade, or delivery date from products we have available for sale. These exchanges are valued at cost, and although a transportation, location or product differential may be recorded, generally no gain or loss is recognized.
	PROPERTY, PLANT AND EQUIPMENT – Property, plant and equipment is recorded at cost. We capitalize costs that extend or increase the future economic benefits of property, plant and equipment, and expense maintenance costs that do not. When assets are disposed of, their cost and related accumulated depreciation are removed from the balance sheet, and any resulting gain or loss is recorded within operating expenses in the consolidated statements of income.
	Depreciation is calculated primarily on the straight-line method over the following estimated useful lives:
	Pipelines and related facilities	20 years
	Storage and terminal facilities	10 –25 years
	Trucking equipment and other	3 – 7 years
	Construction in process is reclassified to the fixed asset categories above and depreciation commences once the asset has been placed in-service.
	LINEFILL – Pipelines and storage facilities generally require a minimum volume of product in the system to enable the system to operate. Such product, known as linefill, is generally not available to be withdrawn from the system. Linefill owned by us in facilities operated by us is recorded at historical cost, is included in property, plant and equipment in the consolidated balance sheets, and is not depreciated. We also own linefill in third-party facilities, which is included in inventory on the consolidated balance sheets.
	IMPAIRMENT OF LONG-LIVED ASSETS – We test long-lived asset groups for impairment when events or circumstances indicate that the net book value of the asset group may not be recoverable. We test an asset group for impairment by estimating the undiscounted cash flows expected to result from its use and eventual disposition. If the estimated undiscounted cash flows are lower than the net book value of the asset group, we then estimate the fair value of the asset group and record a reduction to the net book value of the assets and a corresponding impairment loss.
	GOODWILL — We test goodwill for impairment on an annual basis, or more often if circumstances warrant, by estimating the fair value of the asset group to which the goodwill relates and comparing this fair value to the net book value of the asset group. If fair value is less than net book value, we estimate the implied fair value of goodwill, reduce the book value of the goodwill to the implied fair value, and record a corresponding impairment loss. Our policy is to test goodwill for impairment on October 1st of each year.
	INTANGIBLE ASSETS — Intangible assets are stated at cost, net of accumulated amortization, which is recorded on a straight-line basis over the life of the asset. We review amortizable intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. If such a review should indicate that the carrying amount of amortizable intangible assets is not recoverable, we reduce the carrying amount of such assets to fair value.
	EQUITY METHOD INVESTMENTS — We account for an investment under the equity method when we have significant influence over, but not control of, the significant operating decisions of the investee. Under the equity method, we record in the consolidated statements of income our share of the earnings or losses of the investee, with a corresponding adjustment to the investment balance on our consolidated balance sheet. When we receive a distribution from an equity method investee, we record a corresponding reduction to the investment balance.
	DEBT ISSUANCE COSTS — Costs incurred in connection with the issuance of long-term debt are reported as other noncurrent assets and are amortized to interest expense using the straight-line method over the term of the related debt. Use of the straight-line method of amortization does not differ materially from the “effective interest” method.
	COMMODITY DERIVATIVE INSTRUMENTS – We generally record the fair value of derivative instruments on the consolidated balance sheets and the change in fair value as an increase or decrease to product revenue. As shown in Note 6, the fair value of derivatives at December 31, 2014 and 2013 are recorded to other current assets or other current liabilities on the consolidated balance sheets. Related margin deposits are recorded to other current assets or other current liabilities on the consolidated balance sheets. Margin deposits have not generally been netted against derivative assets or liabilities at December 31, 2014 and 2013.
	The fair value of a derivative contract is determined based on the nature of the transaction and the market in which the transaction was executed. Quoted market prices, when available, are used to value derivative transactions. In situations where quoted market prices are not readily available, we estimate the fair value using other valuation techniques that reflect the best information available under the circumstances. Fair value measurements of derivative assets include consideration of counterparty credit risk. Fair value measurements of derivative liabilities include consideration of our creditworthiness.
	We have elected “normal purchase” and “normal sale” treatment for certain commitments to purchase or sell petroleum products at future dates. This election is only available when a transaction is expected to result in physical delivery of product over a reasonable period in the normal course of business and is not expected to be net settled. Agreements accounted for under this election are not recorded at fair value; instead, the transaction is recorded when the product is delivered.
	CONTINGENT LOSSES – We record a liability for a contingent loss when it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. We record attorneys’ fees incurred in connection with a contingent loss at the time the fees are incurred. We do not record liabilities for attorneys’ fees that are expected to be incurred in the future.
	ASSET RETIREMENT OBLIGATIONS – Asset retirement obligations include legal or contractual obligations associated with the retirement of long-lived assets, such as requirements to incur costs to dispose of equipment or to remediate the environmental impacts of the normal operation of the assets. We record liabilities for asset retirement obligations when a known obligation exists under current law or contract and when a reasonable estimate of the value of the liability can be made.
	REVENUE RECOGNITION – Product revenues relate primarily to our marketing business in the Bakken Shale area and to certain fixed-margin transactions related to our pipeline system in Kansas and Oklahoma. The fixed-margin transactions are structured such that we purchase crude oil from a producer or supplier at a designated receipt point at an index price less a transportation fee, and simultaneously sell an identical volume of crude oil at a designated delivery point to the same party at the same index price, thereby locking in a fixed margin that is, in effect, economically equivalent to a transportation fee. Sales of product are recognized at the time title to the product transfers to the purchaser, which typically occurs upon receipt of the product by the purchaser. Any transportation costs we incur to ship product on third-party infrastructure are included in the price of product sold to customers, and are included within product revenues and costs of products sold. Taxes collected from customers and remitted to governmental authorities are recorded on a net basis (excluded from revenue). As described in Note 6, product revenues include realized and unrealized gains and losses on commodity derivatives.
	Under our current operations, fixed-fee service revenues relate primarily to our storage terminal in Cushing, our pipeline system in Kansas and Oklahoma (excluding transactions whereby we take title to the product while it is in our pipeline system, as described above), our WOT pipeline, our crude oil truck unloading facility in Platteville, Colorado and our truck transportation assets. Service revenues are recognized at the time the service is performed.
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers", which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP.
	The standard is effective for annual periods beginning after December 15, 2016, and interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2017.
	COSTS OF PRODUCTS SOLD — Costs of products sold consists of the cost to purchase the product and any third-party cost incurred to transport the product to the point of sale and to store the product until it is sold.
	PURCHASES AND SALES OF INVENTORY WITH THE SAME COUNTERPARTY – We routinely enter into transactions to purchase inventory from, and sell inventory to, the same counterparty. Such transactions that are entered into in contemplation of one another are recorded on a net basis.
	INCOME TAXES – We are a partnership for income tax purposes and therefore are not subject to federal or state income taxes. The tax on our net income is borne by the individual partners through the allocation of taxable income. Net income for financial statement purposes may differ significantly from taxable income allocated to our partners because of differences between the tax basis and financial reporting basis of assets and liabilities and the taxable income allocation requirements of our partnership agreement. The aggregate difference in the basis of our net assets for financial and tax reporting purposes cannot be readily determined because information regarding each partner’s tax attributes is not available to us.
	EARNINGS PER 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, which are declared and paid following the close of each quarter.
	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.
	COMMON CONTROL TRANSACTIONS – Entities and assets acquired from SemGroup and its affiliates are accounted for as common control transactions whereby the net assets acquired are recorded at their historical amounts. Any consideration in excess of the historical amount is treated as an equity transaction, similar to a dividend, which reduces the partners' equity accounts pro-rata based on their relative ownership percentages. Cash consideration up to the carrying value of net assets acquired is presented as an investing activity in our consolidated statements of cash flows. Cash consideration in excess of the carrying value of net assets acquired is presented as a financing activity.
	NONCONTROLLING INTERESTS IN CONSOLIDATED SUBSIDIARIES – Noncontrolling interests represents the ownership interest in our consolidated subsidiary, SemCrude Pipeline, L.L.C. ("SCPL"), which was retained by SemGroup prior to our acquisition of the remaining noncontrolling interest in 2014. Income was allocated to noncontrolling interests pro-rata based on relative ownership interests in SemCrude Pipeline.
	RECLASSIFICATIONS – Certain reclassifications have been made to conform prior year balances to the current year presentation.
	EQUITY-BASED COMPENSATION—We grant certain of our employees equity-based compensation awards which vest contingent on continued service of the recipient. We record compensation expense for these outstanding awards over applicable service periods based on their grant date fair value with a corresponding increase to partners' capital. The expense to be recorded over the life of the awards is discounted for expected forfeitures during the vesting period.
	OPERATING SEGMENT – Our operations are similar in geography, nature of the services we provide, and type of customers we serve. We are managed by SemGroup as one operating segment.
	COMPREHENSIVE INCOME – Comprehensive income is defined as a change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources and includes all changes in equity during a period except those resulting from investments by owners and distributions to owners. Rose Rock has no items of comprehensive income, other than net income, in any period presented. Therefore, net income and comprehensive income are the same.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Acquisitions [Abstract]
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	ACQUISITIONS
	During the year ended December 31, 2014, we completed the following acquisitions:
	SemCrude Pipeline, L.L.C.
	On June 23, 2014, we acquired the remaining 33% interest in SCPL from SemGroup in exchange for (i) cash of approximately $114.4 million, (ii) the issuance of 2.425 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 2% general partner interest in us. SCPL owns a 51% membership interest in White Cliffs. 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.
	Class A units were 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. The Class A units converted to common units in January 2015.
	The cash consideration was funded through a borrowing under our credit facility. The 2.425 million common units were valued at $49.49 per unit, or $120.0 million, based on the closing price on June 19, 2014, which was the date on which the transaction price was determined. The Class A units were valued at $49.49 per unit discounted for the expected forbearance of distributions, or $58.6 million. The non-cash contribution to the general partner's capital account was made in the amount of $3.6 million.
	Crude oil trucking assets
	On June 24, 2014, we acquired crude oil trucking assets from a subsidiary of Chesapeake Energy Corporation ("Chesapeake") for $44.0 million in cash. Highlights of the transaction include:
	•	124 trucks, 122 trailers and miscellaneous equipment; and
	•	a long-term transportation agreement with Chesapeake Energy Marketing, Inc.
	The results of operations of these assets from June 24, 2014 to December 31, 2014 have been included in our consolidated statement of income and in our consolidated balance sheet as of December 31, 2014. During the year ended December 31, 2014, our consolidated statements of income did not include material amounts of revenue or operating income related to these assets. The proforma impact to comparative prior year periods, had the acquisition occurred at the beginning of the comparative prior year period, is not significant.
	Fair values of the acquired assets were determined based on the cost, income and market approach methodologies. The trucks and equipment acquired were valued based on the cost approach, which considers the replacement cost of the assets adjusted for depreciation and physical deterioration, and the market approach, which considers the value of transactions for comparable assets. The value of the customer contract was determined based on the income approach using the excess earnings method over the remaining life of the contract and assuming a 95% probability of renewal.
	We have recorded the fair value of the assets acquired as follows (in thousands):
	Property, plant and equipment	$	19,092
	Customer contract intangible	17,010
	Goodwill	7,892
	Total assets acquired	$	43,994
	The above finalized purchase price allocation resulted in adjustments to previously reported estimates. Our preliminary estimate of the value of the acquired property, plant and equipment was reduced by $2.6 million and our estimate of the value of the intangible asset was increased by $12.6 million which resulted in a decrease in the value of the associated goodwill of $10.0 million.
	Goodwill represents the excess of the consideration paid for the acquired business over the fair value of the individual assets acquired. Goodwill primarily represents the value of the acquired business as a platform for growth and the acquired assembled workforce.
	During the year ended December 31, 2013, we completed the following acquisitions:
	SemCrude Pipeline, L.L.C.
	On January 11, 2013, we acquired a 33% interest in 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 2% general partner interest in us.
	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 (Note 11). 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 on January 11, 2013. 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.
	On December 16, 2013, we acquired an additional 33% interest in SCPL from SemGroup in exchange for (i) cash of approximately $173.1 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 2% general partner interest in us.
	The cash consideration was funded through a borrowing under our credit facility. The 1.5 million common units were valued at $36.30 per unit, or $54.5 million, based on the closing price on December 11, 2013, which was the date on which the transaction price was determined. The Class A units were valued at $36.30 per unit discounted for the expected forbearance of distributions, or $39.6 million. The non-cash contribution to the general partner's capital account was made in the amount of $1.9 million.
	In conjunction with the SCPL transactions, we incurred $4.1 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 $0.9 million was expensed as general and administrative expense in the consolidated statement of income.
	As the SCPL transactions were between entities under common control, we recorded our investment in White Cliffs 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.
	Barcas Field Services, LLC
	On September 1, 2013, we completed the acquisition of the assets of Barcas Field Services, LLC ("Barcas") for $49.0 million in cash. Highlights of the acquisition include the following:
	•	114 trucks, 120 trailers and miscellaneous equipment; and
	•	a long-term take-or-pay customer transportation agreement.
	Fair values of the acquired assets were determined based on the cost, income and market approach methodologies. The trucks and equipment acquired were valued based on the cost approach which considers the replacement cost of the assets adjusted for depreciation and physical deterioration. The value of the customer contract was determined based on the income approach using the excess earnings method over the remaining life of the contract and assuming a 50% probability of renewal. The market approach which considers the value of comparable transactions was used to value the acquired land.
	We have recorded fair values of the assets acquired as follows (in thousands
	Property, plant and equipment	$	13,865
	Customer contract intangible	6,880
	Goodwill	28,224
	Total assets acquired	$	48,969
	Based on the final purchase price allocation, the amounts above differ from those reported at December 31, 2013 by a non-cash adjustment which decreased goodwill and other intangible assets and increased property, plant and equipment by $0.1 million.
	Goodwill represents the excess of the consideration paid for the acquired business over the fair value of the individual assets acquired. Goodwill primarily represents cost savings due to the ability to transport using the acquired trucks rather than third-party trucks, the ability to bring more volume from the field into our pipelines, the opportunity to use the acquired business as a platform for growth and the acquired assembled workforce.
	Tampa Pipeline
	On November 8, 2013, we acquired 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 $8.2 million. The pipeline had been recently constructed by Noble Energy, Inc. and was placed into service with the acquisition. The pipeline connects our Platteville, Colorado crude oil terminal to the Tampa, Colorado crude oil market.
	Subsequent Event
	On February 13, 2015, we acquired the Wattenberg Oil Trunkline and Glass Mountain Holding, LLC, which owns a 50% interest in Glass Mountain Pipeline LLC ("Glass Mountain"), from SemGroup in exchange for (i) cash of approximately $251.2 million, (ii) the issuance of 1.75 million common units and (iii) 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 2% general partner interest in us. The cash consideration was funded through a borrowing under our credit facility and the issuance and sale of 2.3 million common units in an underwritten public offering for net proceeds of $89.1 million. As the transaction was between entities under common control, we will record the acquired assets and liabilities based on SemGroup's historical cost. The purchase price in excess of historical cost will be treated as an equity transaction with SemGroup, which will reduced the capital accounts of our general and limited partners on a pro-rata basis.

Equity_Method_Investment

Equity Method Investment	12 Months Ended
	Dec. 31, 2014
Investments in nonconsolidated affiliates [Abstract]
Equity Method Investments [Text Block]	EQUITY METHOD INVESTMENT
	SemCrude Pipeline, L.L.C.
	Prior to our December 16, 2013 acquisition of additional ownership interests in SCPL (Note 3), we accounted for our interest in SCPL under the equity method. Subsequent to our acquisition of additional ownership interests on December 16, 2013, we consolidated SCPL and reported a noncontrolling interest, the ownership interest in SCPL which was retained by SemGroup, until our purchase of the noncontrolling interest on June 23, 2014. Our consolidated income statement for the year ended December 31, 2013 includes $13.8 million of equity earnings from SCPL prior to consolidation. For the year ended December 31, 2013, we received cash distributions from SCPL of $17.0 million.
	SCPL's only substantial asset is a 51% interest in White Cliffs, which is accounted for under the equity method.
	White Cliffs Pipeline, L.L.C.
	For the years ended December 31, 2014 and 2013, we recorded equity in earnings of White Cliffs of $57.4 million and $3.8 million, respectively. The equity earnings for the year ended December 31, 2013 represent one month of earnings subsequent to our consolidation of SCPL. We received cash distributions from White Cliffs of $66.8 million for the year ended December 31, 2014. No distributions were received from White Cliffs for the year ended December 31, 2013, as distributions are paid on a one-month lag. Our distribution of earnings related to December 2013 was received in January 2014.
	Certain summarized balance sheet information of White Cliffs as of December 31, 2014 and 2013 is shown below (in thousands):
		31-Dec-14		31-Dec-13
	Current assets	$	35,623	$	98,457
	Property, plant and equipment, net	471,179		312,831
	Goodwill	17,000		17,000
	Other intangible assets, net	16,043		20,802
	Total assets	$	539,845	$	449,090
	Current liabilities	$	11,108	$	9,648
	Members’ equity	528,737		439,442
	Total liabilities and members’ equity	$	539,845	$	449,090
	Certain summarized income statement information of White Cliffs for the years ended December 31, 2014 and 2013 is shown below (in thousands):
		Year ended December 31, 2014		Year Ended December 31, 2013
	Revenue	$	160,369	$	133,310
	Operating, general and administrative expenses	$	23,067	$	23,825
	Depreciation and amortization expense	$	23,257	$	18,668
	Net income	$	114,045	$	90,817
	The equity in earnings of White Cliffs for the years ended December 31, 2014 and 2013, recorded by SCPL, is less than 51% of the net income of White Cliffs for the same periods. This is due to certain general and administrative expenses incurred in managing the operations of White Cliffs that the other members are not obligated to share. Such expenses are recorded by White Cliffs and are allocated to our membership interest. White Cliffs recorded $1.6 million and $1.8 million of such general and administrative expense for the years ended December 31, 2014 and 2013, respectively.
	The members of White Cliffs are required to contribute capital to White Cliffs to fund an expansion project adding approximately 65,000 barrels per day of capacity. We expect to contribute $40.0 million for this project. The project is expected to be complete in late 2015.
	For the years ended December 31, 2014 and 2013, we contributed $53.3 million and $31.8 million, respectively, related to a project which added a 12-inch line from Platteville, Colorado to Cushing, Oklahoma and increased capacity to 150,000 barrels per day. This project was completed in August 2014. Contributions to White Cliffs in 2014 were partially funded by $14.4 million of contributions from the noncontrolling interest in SCPL.
	Our membership interest in White Cliffs is significant as defined by Securities and Exchange Commission’s Regulation S-X Rule 1-02(w). Accordingly, as required by Regulation S-X Rule 3-09, we have included the audited financial statements of White Cliffs as of December 31, 2014 and 2013 and for each of the three years in the period ended December 31, 2014 as an exhibit to our Annual Report on Form 10-K for the period ended December 31, 2014.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	operty, plant and equipment consists of the following (in thousands):
		December 31,			December 31,
		2014			2013
	Land	$	18,479		$	18,453
	Pipelines and related facilities	227,586			213,459
	Storage and terminal facilities	135,466			124,181
	Linefill	25,507			13,866
	Trucking equipment and other	40,281			19,180
	Construction-in-progress	31,393			19,093
	Property, plant and equipment, gross	478,712			408,232
	Accumulated depreciation	(82,646		)	(57,076		)
	Property, plant and equipment, net	$	396,066		$	351,156
	We recorded depreciation expense of $33.9 million, $22.6 million and $12.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	We include within the cost of property, plant and equipment interest costs incurred while an asset is being constructed. We capitalized $0.3 million and $0.7 million of interest costs during the years ended December 31, 2014 and 2013, respectively. No interest costs were capitalized during the year ended December 31, 2012.
	Amounts disclosed above have been revised to reflect the WOT acquisition as described in Note 1.

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
FINANCIAL INSTRUMENTS	FINANCIAL INSTRUMENTS AND CONCENTRATIONS OF RISK
	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 ("OTC") 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 commodity derivative assets and liabilities at fair value at each balance sheet date with the exception of commitments which have been designated as normal purchases and sales. The table below summarizes the balances of these assets and liabilities at December 31, 2014 and 2013 (in thousands):
		31-Dec-14										31-Dec-13
		Level 1			Netting*				Total			Level 1		Netting*			Total
	Assets	$	3,198		$	(1,637	)		$	1,561		$	36	$	(36	)	$	—
	Liabilities	1,637			(1,637		)		—			96		(36		)	60
	*	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 are based on inputs consisting of unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. These include commodity futures contracts that are traded on an exchange.
	“Level 2” measurements are based on inputs consisting of market observable and corroborated prices for similar derivative contracts. Assets and liabilities classified as Level 2 include OTC traded physical fixed priced purchases and sales forward contracts.
	“Level 3” measurements are based on inputs from a pricing service and/or internal valuation models incorporating observable and unobservable market data.
	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 hierarchy. At December 31, 2014, 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 years ended December 31, 2014, 2013 and 2012, as such no rollforward of activity has been presented.
	The following table sets forth the notional quantities for derivative instruments entered into during the periods indicated (in thousands of barrels):
		Year ended December 31, 2014		Year Ended December 31, 2013			Year Ended December 31, 2012
	Sales	6,641		2,595			1,743
	Purchases	6,477		2,575			1,636
	We have not designated any of our commodity derivative instruments as accounting hedges. We record the fair value of the derivative instruments on our 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):
	31-Dec-14							31-Dec-13
	Assets			Liabilities				Assets			Liabilities
	$	1,561		$	—			$	—		$	60
	We have posted margin deposits as collateral with brokers who have the right of set off associated with these funds. Our margin deposit balances were $0.8 million and $0.8 million at December 31, 2014 and 2013, respectively. 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 December 31, 2014 and 2013, we would have had net asset positions of $2.4 million and $0.8 million, respectively.
	Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands):
	Year Ended			Year Ended				Year Ended
	31-Dec-14			31-Dec-13				31-Dec-12
	$	17,351		$	(1,593	)		$	149
	Concentrations of risk
	During the year ended December 31, 2014, we generated approximately $964 million of revenue from two third-party customers, which represented approximately 74% of our consolidated revenue. We purchased approximately $622 million of product from two third-party suppliers, which represented approximately 55% of our costs of products sold. At December 31, 2014, two third-party customers accounted for 53% of our consolidated accounts receivable.
	As described in Note 14, we also generated revenues and expenses from other subsidiaries of SemGroup.

Goodwill_and_other_intangibles

Goodwill and other intangibles	12 Months Ended
	Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]
	7	GOODWILL AND OTHER INTANGIBLE ASSETS
	Goodwill
	Changes in goodwill are shown below (in thousands):
	Balance at December 31, 2012	$	—
	Barcas acquisition (Note 3)	28,322
	Balance at December 31, 2013	28,322
	Oilfield trucking acquisition (Note 3)	7,892
	Barcas purchase price adjustment	(98		)
	Balance at December 31, 2014	$	36,116
	Other Intangible Assets
	Changes in other intangible assets are shown below (in thousands):
	Balance at December 31, 2012	$	—
	Barcas acquisition	6,930
	Amortization	(1,155		)
	Balance at December 31, 2013	5,775
	Oilfield trucking acquisition	17,010
	Barcas purchase price adjustment	(50		)
	Amortization	(6,095		)
	Balance at December 31, 2014	$	16,640
	For the year ended December 31, 2014, we recorded a $17.0 million customer contract intangible asset related to the Chesapeake trucking acquisition. The intangible is being amortized in proportion with the expected revenues associated with the contract over 20 years.
	The Barcas customer contract intangible was fully amortized during the year ended December 31, 2014 due to certain contractual terms being satisfied.
	We estimate that future amortization of other intangible assets will be as follows (in thousands):
	For the twelve months ending:
	31-Dec-15	$	1,073
	31-Dec-16	1,881
	31-Dec-17	2,132
	31-Dec-18	2,172
	31-Dec-19	1,680
	Thereafter	7,702
	Total estimated amortization expense	$	16,640

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
LONG TERM DEBT	LONG-TERM DEBT
	Our long-term debt consisted of the following (in thousands):
		December 31,		December 31,
		2014		2013
	5.625% senior unsecured notes	$	400,000	$	—
	Revolving credit facility	32,000		245,000
	Capital leases	132		125
	Total long-term debt	432,132		245,125
	less: current portion of long-term debt	40		37
	Noncurrent portion of long-term debt	$	432,092	$	245,088
	Senior unsecured notes
	On July 2, 2014, Rose Rock and its wholly-owned subsidiary, Rose Rock Finance Corporation ("Finance Corp."), as co-issuer, sold $400 million of 5.625% senior unsecured notes due 2022 (the “Notes”) to certain initial purchasers for resale to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”), and to non-U.S. persons outside the United States pursuant to Regulation S of the Securities Act. The Notes are guaranteed by all of our existing subsidiaries other than Finance Corp. Such guarantees of the Notes are full and unconditional and constitute the joint and several obligations of the subsidiary guarantors.
	The net proceeds from the offering of $391.9 million, after underwriters' fees and offering expenses, were used to repay amounts borrowed under our revolving credit facility and for general partnership purposes.
	The Notes are governed by an indenture between the Partnership, its subsidiary guarantors, Finance Corp. and Wilmington Trust, National Association, as trustee (the “Indenture”). The Indenture includes customary covenants, including limitations on our ability to incur additional indebtedness or issue certain preferred shares; pay dividends and make certain distributions, investments and other restricted payments; create certain liens; sell assets; enter into transactions with affiliates; merge, consolidate, sell or otherwise dispose of all or substantially all of our assets; and designate our subsidiaries as unrestricted under the Indenture.
	The Indenture includes customary events of default. A default would permit the trustee or holders of at least 25% in aggregate principal amounts of the Notes then outstanding to declare all amounts owing under the Notes to be due and payable.
	The Notes are effectively subordinated in right of payment to any of our, and the subsidiary guarantors', existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness.
	The Partnership may issue additional Notes under the Indenture from time to time, subject to the terms of the Indenture.
	Except as described below, the Notes are not redeemable at the Partnership's option prior to July 15, 2017. From and after July 15, 2017, the Partnership may redeem the Notes, in whole or in part, at the redemption prices (expressed as percentages of principal amount) set forth below, plus accrued and unpaid interest, if redeemed during the twelve-month period beginning on July 15 of each of the years indicated below:
	Year		Percentage
	2017		104.22%
	2018		102.81%
	2019		101.41%
	2020 and thereafter		100.00%
	Prior to July 15, 2017, the Partnership may, at its option, on one or more occasions, redeem up to 35% of the sum of the original aggregate principal amount of the Notes at a redemption price equal to 105.625% of the aggregate principal amount thereof, plus accrued and unpaid interest, with the net cash proceeds of one or more equity offerings of the Partnership, or the parent of the Partnership to the extent such net proceeds are contributed to the Partnership, subject to certain conditions.
	Prior to July 15, 2017, the Partnership may also redeem all or part of the Notes at a price equal to the principal plus a premium equal to the greater of 1% of the principal or the excess of the present value of the July 15, 2017 redemption price from the table above plus all required interest payments due through July 15, 2017, computed using a discount rate based on a published United States Treasury Rate plus 50 basis points, over the principal value of such Note.
	In the event of a change of control, the Partnership is required to offer to repurchase the Notes at an amount equal to 101% of the principal plus accrued and unpaid interest.
	In accordance with a Registration Rights Agreement, in September 2014 the Partnership filed a registration statement with the SEC, which was declared effective by the SEC on September 23, 2014, enabling holders of the Notes to exchange the Notes and related guarantees for registered notes (the "Exchange Notes") and guarantees that have substantially identical terms as the Notes and related guarantees. The exchange offer expired on October 22, 2014. All of the Notes were exchanged. The guarantees of the Exchange Notes are full and unconditional and constitute the joint and several obligations of the Partnership and its subsidiary guarantors.
	Each of the subsidiary guarantors is 100% owned by the Partnership. The Partnership has no assets or operations independent of its subsidiaries and there are no significant restrictions upon the ability of the Partnership, or any of its subsidiaries, to obtain funds from its respective subsidiaries by dividend or loan. None of the assets of the Partnership's subsidiaries represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X under the Securities Act.
	Interest on the Notes is payable in arrears on January 15th and July 15th to holders of record on January 1st and July 1st each year until maturity. For the year ended December 31, 2014, we recorded interest expense of $11.7 million, including amortization of debt issuance costs. At December 31, 2014, we had $8.0 million of debt issuance costs, net of accumulated amortization, related to the Notes included in other noncurrent assets on our consolidated balance sheet.
	At December 31, 2014, we were in compliance with the terms of the Notes.
	Revolving credit facility
	At December 31, 2014, our credit agreement, as amended, provides for a revolving credit facility of $585 million and includes a $150 million sub-limit for letters of credit. The credit agreement expires September 20, 2018, when all amounts owed will be due, and permits the increase of the facility by not more than $200 million, subject to certain conditions.
	At our option, amounts borrowed under the credit agreement will bear interest at either the Eurodollar rate or an alternate base rate (“ABR”), plus, in each case, an applicable margin. The applicable margin will range from 1.75% to 3.00% in the case of a Eurodollar rate loan, and from 0.75% to 2.00% in the case of an ABR loan, in each case, based on a leverage ratio specified in the credit agreement. At December 31, 2014, we had outstanding borrowings of $32.0 million. Borrowings of $20 million incurred interest at the Eurodollar rate plus an applicable margin and borrowings of $12 million incurred interest at the ABR rate plus an applicable margin. The interest rates at December 31, 2014 were 2.74% for Eurodollar borrowings and 4.75% for ABR borrowings.
	Fees are charged on any outstanding letters of credit at a rate that ranges from 1.75% to 3.00%, depending on a leverage ratio specified in the credit agreement. At December 31, 2014, there were $17.5 million in outstanding letters of credit, and the rate in effect was 2.50%. In addition, a fronting fee of 0.25% is charged on outstanding letters of credit.
	The credit facility also allows for the use of secured bilateral letters of credit, which are issued external to the credit facility and do not reduce revolver availability. At December 31, 2014, we had $67.6 million of secured bilateral letters of credit outstanding and the interest rate in effect was 1.75%.
	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. In addition, we are charged an annual administrative fee of $0.1 million.
	During the years ended December 31, 2014, 2013 and 2012, we recorded $9.0 million, $8.7 million and $1.9 million, respectively, of interest expense related to the credit facility, including amortization of capitalized loan fees. At December 31, 2014, we had $3.8 million in capitalized loan fees, net of accumulated amortization, related to the credit facility included in other noncurrent assets.
	The credit agreement contains representations and warranties and affirmative and negative covenants. The covenants in the agreement include limitations on creation of new indebtedness and liens, entry into sale and lease-back transactions, investments, and fundamental changes including mergers and consolidations, certain cash distributions and other distributions, material changes in our business and modifying certain documents.
	Subsequent to the issuance of the Notes, we elected to adhere to alternative financial performance covenants under our credit facility. These covenants require us to not permit the ratio of our consolidated EBITDA to our consolidated cash interest expense at the end of any fiscal quarter, for the immediately preceding four quarter period, to be less than 2.50 to 1.00, not permit the ratio of our consolidated net debt to our consolidated EBITDA at the end of any fiscal quarter, for the immediately preceding four quarter period, to be greater than 5.50 to 1.00, or not permit the ratio of senior secured debt to our consolidated EBITDA to be greater than 3.50 to 1.00.
	The credit agreement defines events of default, including events of default relating to non-payment of principal and other amounts owing under the agreement from time to time, including in respect of letter of credit disbursement obligations, inaccuracy of representations and warranties in any material respect when made or when deemed made, violation of covenants, cross payment-defaults of us and our restricted subsidiaries to any material indebtedness, cross acceleration to any material indebtedness, bankruptcy and insolvency events, the occurrence of a change of control, certain unsatisfied judgments, certain ERISA events, certain environmental matters and certain assertions of or actual invalidity of certain loan documents. A default under the credit agreement would permit the participating banks to terminate commitments, require immediate repayment of any outstanding loans with interest and any unpaid accrued fees, and require the cash collateralization of outstanding letter of credit obligations.
	The credit agreement restricts our ability to make certain types of payments relating to our units, including the declaration or payment of cash distributions, provided that we may make quarterly distributions of available cash so long as no default under the agreement then exists or would result therefrom. The agreement is guaranteed by all of our material subsidiaries and secured by a lien on substantially all of our property and assets, subject to customary exceptions.
	At December 31, 2014, we were in compliance with the terms of the credit agreement.
	Capital lease obligations
	At December 31, 2014, we had $92 thousand ($132 thousand including current portion) of capital lease obligations reported as long-term debt on the consolidated balance sheet.
	Scheduled principal payments
	The following table summarizes the scheduled principal payments as of December 31, 2014 (in thousands). As described above, our debt agreements require accelerated principal payments under certain circumstances. As a result, principal payments may occur earlier than shown in the table below.
		Senior Unsecured Notes		Revolving Credit		Capital		Total
				Facility		Leases
	For the year ended:
	31-Dec-15	$	—	$	—	$	40	$	40
	31-Dec-16	—		—		40		40
	31-Dec-17	—		—		26		26
	31-Dec-18	—		32,000		26		32,026
	31-Dec-19	—		—		—		—
	Thereafter	400,000		—		—		400,000
	Total	$	400,000	$	32,000	$	132	$	432,132
	Fair value
	We estimate the fair value of our senior unsecured notes to be $368 million at December 31, 2014, based on unadjusted, transacted market prices, which is categorized as a Level 1 measurement. We estimate that the fair value of our revolving long-term debt was not materially different than the reported values at December 31, 2014, and is categorized as a Level 2 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 revolving debt outstanding at December 31, 2014.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
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").
	Claims reconciliation process
	A large number of parties made claims against SemGroup for obligations alleged to have been incurred prior to the Petition Date. We have resolved or settled all of these outstanding claims and have made all required distributions. The Plan of Reorganization has therefore been fully administered.
	On November 7, 2014, SemGroup Corporation and the other reorganized debtors moved for a final decree from the bankruptcy court closing the debtors’ bankruptcy cases. The United States Bankruptcy Court for the District of Delaware granted the request and entered its Order Granting Motion of Remaining Debtors for Entry of Final Decree on December 18, 2014. Accordingly, the bankruptcy cases for SemCrude, L.P., Eaglwing, L.P., SemCanada II, L.P., SemCanada L.P., SemGas, L.P., SemGroup, L.P., SemMaterials, L.P., and SemStream, L.P. have been closed. As part of its decree, the Court retained jurisdiction over certain on-going adversary proceedings, but the debtors have estimated and paid the claims associated with these remaining adversaries, leaving the non-debtor parties to the adversaries to resolve their remaining claims amongst themselves.
	On January 2, 2015, Bettina M. Whyte, the duly appointed Trustee of the SemGroup Litigation Trust (the “Litigation Trustee”), filed a notice of appeal of the Bankruptcy Court’s December 18, 2014 order closing the aforementioned bankruptcy cases. However, the Bankruptcy Court’s order of final decree was effective upon entry, and the appeal does not stay the effect of the order. The Litigation Trustee’s appeal to the United States District Court for the District of Delaware is currently pending and will be opposed by SemGroup Corporation and the other remaining reorganized debtors. We are indemnified by SemGroup against any loss in this matter pursuant to the terms of the omnibus agreement with SemGroup.
	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 the KDHE believed, based on their historical use, may have soil or groundwater contamination in excess of state standards. The 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 the KDHE to conduct environmental assessments on the sites and to pay the 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 appeared to have ground water contamination requiring further delineation and/or on-going monitoring. Work plans have been submitted to, and approved by, the KDHE. One site was closed and we anticipate closure in 2015 for three of the remaining four sites. 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 with SemGroup.
	Dimmit County, TX claims
	An employee of Rose Rock Midstream Field Services, LLC was involved in a tractor trailer accident on January 15, 2015 in Dimmit County, Texas.  A second accident followed resulting in six fatalities and multiple injuries. At this time, the following lawsuits have been filed in either the District Court of Zavala County, Texas or the District Court of Dimmit County, Texas, Olga D. Rubio and Carlos Rubio, Individually and on Behalf of All Statutory Wrongful Death Beneficiaries of Carlos Rubio, Jr., Deceased vs. Rose Rock Midstream Field Services, LLC and Jesus T. Riojas; David Rodriguez and Maribel Rodriguez vs. Rose Rock Midstream Field Services, LLC and Jesus T. Riojas; David Rodriguez and Maribel Rodrigues, Plaintiffs and Alejandra Abigail Ortega, Individually and as next friend of K.A.P., a minor, and as Representative of the Estate of Eduardo Pena, and Julian Pena and Nelva G. Suifuentes Pena Intervenors vs. Rose Rock Midstream Field Services, LLC, Jesus Riojas, and Roberto Rivera; Derek Muhlenbruch vs. Rose Rock Midstream Field Services, LLC and Jesus T. Riojas; and Agustin Lara, Sr., Individually, and Elsa Zamarripa, Individually and As Representative of the Estate of Justin Lara, Deceased vs. Rose Rock Midstream Field Services, LLC and Jesus T. Riojas.  It is anticipated that additional lawsuits will be brought on behalf of the other deceased and injured parties.  We are currently working with counsel for the interested parties to investigate the accident, and no determination of liability has been made.  We will continue to defend our position and believe that any liability that may arise from this incident will be covered by our insurance; however, we cannot predict the outcome.
	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 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. SemGroup believes Blueknight’s causes of action to be without merit and 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 with SemGroup.
	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.
	Operating leases
	We have entered into operating lease agreements for office space, office equipment, land and trucks. Future minimum payments required under operating leases that have initial or remaining non-cancellable lease terms in excess of one year at December 31, 2014 are as follows (in thousands):
	For twelve months ending:
	December 31, 2015	$	986
	December 31, 2016	823
	December 31, 2017	617
	December 31, 2018	417
	December 31, 2019	250
	Thereafter	11
	Total future minimum lease payments	$	3,104
	We recorded lease and rental expenses of $1.5 million, $1.2 million and $1.0 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	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 December 31, 2014, such commitments included the following (in thousands
		Volume		Value
		(barrels)
	Fixed price purchases	13,648		$	1,141,694
	Fixed price sales	13,612		$	1,152,966
	Floating price purchases	7,187		$	373,539
	Floating price sales	7,293		$	389,949
	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 (at 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).
	Capital contribution requirements
	See Note 4 for information related to capital funding requirements related to White Cliffs.

Employee_Benefits_and_EquityBa

Employee Benefits and Equity-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
EMPLOYEE BENEFITS AND EQUITY-BASED COMPENSATION
		EMPLOYEE BENEFITS AND EQUITY-BASED COMPENSATION
	We do not directly employ any persons to manage or operate our business, as these functions are performed by employees of SemGroup. At December 31, 2014, SemGroup had approximately 360 employees who were dedicated primarily to the management and operation of our business. None of these employees are represented by labor unions, and none are subject to collective bargaining agreements.
	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. 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. Awards are valued based on the grant date closing price listed on the New York Stock Exchange. Compensation expense is recognized over the vesting period and is discounted for estimated forfeitures. We use authorized but unissued units to satisfy our equity-based payment obligations. Although these awards are to be settled in units, we may elect to give participants the option of settling a portion of the awards in cash, to meet statutory minimum tax withholding requirements. The activity related to these awards is summarized below:
		Unvested Units	Average Grant Date Fair Value		Aggregate Fair Value of Units (in thousands)
	Outstanding at December 31, 2011	—	$	—
	Awards granted	46,069	$	21.97
	Awards vested	—	$	—	$	—
	Awards forfeited	-2,109	$	20.6
	Outstanding at December 31, 2012	43,960	$	21.91
	Awards granted	49,104	$	34.41
	Awards vested	-9,333	$	27.25	$	254
	Awards forfeited	-783	$	34.4
	Outstanding at December 31, 2013	82,948	$	28.59
	Awards granted	46,536	$	41.35
	Awards vested	-5,712	$	35.87	$	205
	Awards forfeited	-21,432	$	29.82
	Outstanding at December 31, 2014	102,340	$	33.79
	During the month of January 2015, 25,745 of these awards vested. Of these vested awards, 10,537 units were withheld to satisfy minimum tax requirements.
	Compensation cost expensed for the years ended December 31, 2014, 2013 and 2012 was $0.9 million, $0.8 million and $0.3 million, respectively. As of December 31, 2014, there was $1.8 million of total unrecognized compensation cost related to our nonvested awards, which is expected to be recognized over a weighted-average period of 19 months.
	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. For the year ended December 31, 2014, no UUD units were issued upon the vesting of restricted units. For the year ended December 31, 2013, 406 UUD units were issued upon the vesting of restricted units. At December 31, 2014, the value of outstanding UUD’s was approximately $129 thousand. This is equivalent to approximately 2,835 common units based on the market price of our common units at the close of business on December 31, 2014 of $45.45 per unit. During the month of January 2015, 3,335 units were issued upon the vesting of restricted units noted above. Distributions related to the restricted unit awards granted subsequent to 2012 will be settled in cash upon vesting. At December 31, 2014, the value of these UUDs related to cash settled unvested restricted units was approximately $177 thousand.
	SemGroup stock-based compensation
	Certain of SemGroup’s employees who support us participate in SemGroup’s equity-based compensation program. Awards under this program generally represent awards of restricted stock of SemGroup, which are subject to specified vesting periods. SemGroup charged us $1.1 million, $0.7 million and $0.6 million during the years ended December 31, 2014, 2013 and 2012, respectively, related to such equity-based compensation.
	Defined contribution plan
	Most of the employees of SemGroup who support us participate in one of SemGroup’s defined contribution plans. SemGroup charged us $0.9 million, $0.4 million and $0.3 million during the years ended December 31, 2014, 2013 and 2012, respectively, for contributions made by SemGroup to this plan.
	Allocated employee compensation expenses
	As described in Note 14, SemGroup allocated certain corporate general and administrative expenses to us. These allocated expenses included equity-based compensation and defined contribution plan benefits for corporate employees, and such expenses are in addition to the expenses described above for employees who directly support our operations.

Partners_Capital_and_Distribut

Partners' Capital and Distributions	12 Months Ended
	Dec. 31, 2014
Partners' Capital [Abstract]
PARTNERS' CAPITAL AND DISTRIBUTIONS
		PARTNERS’ CAPITAL AND DISTRIBUTIONS
	General partner
	SemGroup owns the 2% general partner interest in us, and, through this general partner interest, has the right to manage and operate us. SemGroup may not be removed as general partner except by a vote of the holders of at least 66 2/3% of the outstanding limited partner units voting together as a single class, including any limited partner units owned by our general partner and its affiliates, including SemGroup.
	Limited partner interests—common units
	Limited partners have the right to vote on certain matters. For example, a unit majority is required to make certain types of amendments to the partnership agreement, to allow the sale of substantially all of our assets, or to dissolve the Partnership. Limited partners also have certain distribution rights, as summarized below.
	Limited partner interests – subordinated units
	The holders of subordinated limited partner units have similar voting rights to holders of common limited partner units. However, as described below, the distribution rights for holders of subordinated units are different than those of common units. On February 17, 2015, all subordinated units converted to common units upon the achievement of certain targets specified in our partnership agreement. The conversion did not impact the total number of the Partnership’s outstanding units representing limited partner interests.
	Limited partner interests – Class A units
	As described in Note 3, Class A units were not eligible to receive cash distributions until certain operational targets were achieved by White Cliffs, at which time they would convert to common units. In December 2014, these operational targets were achieved by White Cliffs and on January 1, 2015 all 3,750,000 Class A units were converted to common units on a one-for-one basis. As the conversion took place before the date of record for our distribution of fourth quarter 2014 earnings, the Class A units participated in those distributions. The conversion did not impact the total number of the Partnership’s outstanding units representing limited partner interests.
	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 common and subordinated 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							$	0.3625	98.00%	2.00%	—	%
	First Target Distribution	above		$	0.3625		up to	$	0.416875	98.00%	2.00%	—	%
	Second Target Distribution	above		$	0.416875		up to	$	0.453125	85.00%	2.00%	13	%
	Third Target Distribution	above		$	0.453125		up to	$	0.54375	75.00%	2.00%	23	%
	Thereafter						above	$	0.54375	50.00%	2.00%	48	%
	Distributions paid
	The following table shows distributions paid in 2015, 2014, 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
	31-Dec-13		4-Feb-14		14-Feb-14	$0.47
	31-Mar-14		5-May-14		15-May-14	$0.50
	30-Jun-14		4-Aug-14		14-Aug-14	$0.54
	30-Sep-14		4-Nov-14		14-Nov-14	$0.57
	31-Dec-14		3-Feb-15		13-Feb-15	$0.62
	* 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.
	Limited Partner Units
	Changes in our limited partner units are as follows:
		Common			Common		Subordinated		Class A units
		Units -			Units -		Units
		Public			SemGroup
	December 14, 2011 initial public offering	7,000,000			1,389,709		8,389,709		—
	Balance at December 31, 2012	7,000,000			1,389,709		8,389,709		—
	Private placement	2,000,000			—		—		—
	Units issued to SemGroup in SemCrude Pipeline transactions	—			3,000,000		—		2,500,000
	August common unit offering	4,750,000			—		—		—
	Vesting of equity-based compensation awards, including equivalent distributions	9,739			—		—		—
	Balance at December 31, 2013	13,759,739			4,389,709		8,389,709		2,500,000
	Units issued to SemGroup in SemCrude Pipeline transaction	—			2,425,000		—		1,250,000
	Vesting of equity-based compensation awards, including equivalent distributions	5,712			—		—		—
	Balance at December 31, 2014	13,765,451			6,814,709		8,389,709		3,750,000
	There were no units issued between the December 14, 2011 initial public offering and December 31, 2012.
	Equity Issuances
	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.
	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 the initial 33% interest in SCPL.
	See Note 3 for information related to units issued to SemGroup as consideration in the SemCrude Pipeline transactions.
See Note 10 for information related to units issued due to vesting of equity-based compensation awards.
Subsequent Events
On January 1, 2015, based upon satisfying certain operational targets by White Cliffs, all 3,750,000 Class A units were converted to common units on a one-for-one basis. The conversion did not impact the total number of the Partnership's outstanding units representing limited partner interests.
On February 13, 2015, we issued and sold 2.3 million common limited partner units to the public for net proceeds of $89.1 million. Proceeds were used to acquire the Wattenberg Oil Trunkline and a 50% interest in Glass Mountain from SemGroup. See Note 3 for additional information related to the acquisition including units issued to SemGroup as consideration.
On February 17, 2015, certain targets specified in our partnership agreement were achieved and all 8,389,709 subordinated units were converted to common units. The conversion did not impact the total number of the partnership’s outstanding units representing limited partner interests.

Earnings_Per_Limited_Partner_U

Earnings Per Limited Partner Unit	12 Months Ended
	Dec. 31, 2014
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 tables set forth the computation of basic and diluted earnings per limited partner unit for the years ended December 31, 2014, 2013 and 2012 (in thousands, except per unit data):
		Year Ended December 31, 2014		Year Ended December 31, 2013			Year Ended December 31, 2012
	Net income attributable to Rose Rock Midstream, L.P.	$	55,167	$	36,259		$	23,954
	Less: General partner’s incentive distribution earned (*)	6,698		483			—
	Less: General partner’s 2.0% ownership, including amounts related to WOT revision (Note 1)	1,444		245			479
	Net income allocated to limited partners	$	47,025	$	35,531		$	23,475
	Numerator for basic and diluted earnings per limited partner unit (**):
	Allocation of net income among limited partner interests:
	Net income allocable to common units	$	32,914	$	22,701		$	11,737.50
	Net income allocable to subordinated units	13,912		13,321			11,737.50
	Net income (loss) allocable to Class A units	199		(491		)	—
	Net income allocated to limited partners	$	47,025	$	35,531		$	23,475
	Denominator for basic and diluted earnings per limited partner unit:
	Basic weighted average number of common units outstanding	19,419		13,672			8,390
	Effect of non-vested restricted units	65		36			16
	Diluted weighted average number of common units outstanding	19,484		13,708			8,406
	Basic and diluted weighted average number of subordinated units outstanding	8,390		8,390			8,390
	Basic and diluted weighted average number of Class A units outstanding	3,154		1,264			—
	Earnings (loss) per limited partner unit:
	Common units (basic)	$	1.69	$	1.66		$	1.4
	Common units (diluted)	$	1.69	$	1.66		$	1.4
	Subordinated units (basic and diluted)	$	1.66	$	1.59		$	1.4
	Class A units (basic and diluted)	$	0.06	$	(0.39	)	$	—
	(*) Based on the amount of the distributions declared per common unit related to earnings for the year ended December 31, 2012, our general partner was not entitled to receive incentive distributions for that period.
	(**) 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. Prior to the conversion of the Class A units in January 2015, the Class A units did not participate in cash distributions, but were allocated a proportional share of undistributed earnings. Class A units will receive the declared distribution for the fourth quarter of 2014, as such the fourth quarter distribution is reflected in the earnings attributable to Class A units for the year ended December 31, 2014. As distributions related to the available cash exceeded net income, the Class A units reflect a loss for the year ended December 31, 2013.

Supplemental_Information_State

Supplemental Information - Statements Of Cash Flows	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Information - Statements of Cash Flows	SUPPLEMENTAL INFORMATION —STATEMENTS OF CASH FLOWS
	Acquisitions
	In connection with the acquisition of the remaining interest in SCPL in 2014 (Note 3), we issued 2.425 million common units and 1.25 million Class A units, valued at $120.0 million and $58.6 million, respectively, as non-cash consideration to SemGroup. In addition a non-cash contribution of $3.6 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 $206.6 million of purchase price in excess of historical cost, $24.4 million represented cash consideration in excess of historical cost and the remaining $182.2 million reduction represented the non-cash portion of the transaction related to equity consideration.
	In connection with the acquisition of SCPL in 2013, we issued 3.0 million common units and 2.5 million Class A units, valued at $98.9 million and $70.1 million, respectively, as non-cash consideration to SemGroup. In addition, a non-cash contribution of $4.6 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 SCPL was treated as an equity transaction with SemGroup, which reduced the partners' capital accounts pro-rata based on ownership percentages. Of the $414.3 million of purchase price in excess of historical cost, $240.6 million represented cash consideration in excess of historical cost and the remaining $173.7 million reduction represented the non-cash portion of the transaction related to equity consideration.
	Other supplemental disclosures
	We paid cash for interest totaling $8.5 million, $7.2 million and $1.2 million during the years ended December 31, 2014, 2013 and 2012, respectively. We accrued $1.2 million, $1.5 million and $0.1 million for purchases of property, plant and equipment at December 31, 2014, 2013 and 2012, respectively, including amounts related to the WOT acquisition as described in Note 1.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
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 $34.0 million, $13.5 million and $12.1 million during the years ended December 31, 2014, 2013 and 2012, respectively, for direct employee costs, including equity compensation and defined contribution plan benefits described in Note 10 and including amounts related WOT due to the acquisition described in Note 1. These expenses were recorded to operating expenses and to general and administrative expenses in our 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. The allocation of expenses is determined based on a transfer pricing analysis which is periodically updated. The most recent update occurred in December 2014.
	SemGroup charged us $10.7 million, $7.3 million and $6.4 million during the years ended December 31, 2014, 2013 and 2012, respectively, for such allocated costs, including amounts related to WOT due to the acquisition described in Note 1. These expenses were recorded to general and administrative expenses in our consolidated statements of income.
	Common control transactions
	During 2014 and 2013, we purchased interests in SCPL from SemGroup. See Note 3 for additional information.
	NGL Energy Partners LP and subsidiaries (Gavilon, LLC and High Sierra Crude Oil and Marketing, LLC)
	For the years ending December 31, 2014, 2013 and 2012, we generated revenues from NGL Energy in the amounts of $400.3 million, $693.2 million and $362.7 million, respectively. For the years ending December 31, 2014, 2013 and 2012, we made purchases of condensate from NGL Energy in the amounts of $437.0 million, $669.4 million and $328.6 million, respectively. We received reimbursements from NGL Energy for certain services in the amount of $168.0 thousand and $182.0 thousand for the years ended December 31, 2014 and 2013, respectively. There were no reimbursements from NGL Energy during the year ended December 31, 2012.
	Transactions with NGL Energy and its subsidiaries primarily relate to marketing, storage and transportation services of crude oil, including buy/sell transactions. In accordance with ASC 845-10-15, these transactions were reported as revenue on a net basis in our consolidated statements of income because the purchases of inventory and subsequent sales of the inventory were with the same counterparty. For comparability, prior year amounts above have been revised to include transactions with Gavilon, LLC, which was not affiliated with NGL Energy until December 2013.
	SemGas
	We purchase condensate from SemGas, L.P. (“SemGas”), which is also a wholly-owned subsidiary of SemGroup. Our purchases from SemGas were $37.9 million, $24.0 million and $10.6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	White Cliffs
	We provide storage and management services to White Cliffs. We generated revenues from White Cliffs of $2.9 million, $2.9 million and $2.5 million for the years ended December 31, 2014, 2013 and 2012, respectively. We incurred $3.9 million of cost for the year ended December 31, 2014 related to transportation fees for shipments on White Cliffs.
	Glass Mountain Pipeline, LLC
	SemGroup holds a 50% interest in Glass Mountain. We incurred $0.8 million of cost for the year ended December 31, 2014 related to transportation fees for shipments on Glass Mountain's pipeline. We received $0.5 million in fees from Glass Mountain for the year ended December 31, 2014 related to support services associated with Glass Mountain's pipeline operations.
	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, $0.4 million and $0.6 million in legal fees and related expenses to this law firm during the years ended December 31, 2014, 2013 and 2012, respectively.
	Our equity method investee, White Cliffs, paid legal fees and related expenses to this law firm of $0.1 million and $0.2 million during the years ended December 31, 2014 and 2013, respectively.

Quarterly_Financial_Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Quarterly Financial Data	QUARTERLY FINANCIAL DATA (UNAUDITED)
	Summarized information on the unaudited consolidated net income of Rose Rock Midstream, L.P. for the quarters during the year ended December 31, 2014, is shown below (in thousands), includes all normal recurring adjustments that management considers necessary for fair presentation and has been revised due to the WOT acquisition as described in Note 1:
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	Total revenues	$	292,514		$	292,156		$	376,856		$	336,571		$	1,298,097
	Total expenses	284,981			286,650			368,615			331,045			1,271,291
	Earnings from equity method investment	11,080			12,291			16,289			17,718			57,378
	Operating income	18,613			17,797			24,530			23,244			84,184
	Other expenses, net	2,387			2,709			8,010			8,153			21,259
	Net income	16,226			15,088			16,520			15,091			62,925
	Less: net income attributable to noncontrolling interests	3,676			4,082			—			—			7,758
	Net income attributable to Rose Rock Midstream, L.P.	$	12,550		$	11,006		$	16,520		$	15,091		$	55,167
	Earnings (loss) per limited partner unit
	Common unit (basic)	$	0.45		$	0.41		$	0.5		$	0.34		$	1.69
	Common unit (diluted)	$	0.45		$	0.41		$	0.5		$	0.34		$	1.69
	Subordinated unit (basic and diluted)	$	0.45		$	0.37		$	0.5		$	0.34		$	1.66
	Class A unit (basic and diluted)*	$	(0.05	)	$	(0.25	)	$	(0.07	)	$	0.34		$	0.06
	* Class A units converted to common units on January 1, 2015 and were eligible for distributions of fourth quarter 2014 earnings.
	Summarized information on the consolidated net income of Rose Rock Midstream, L.P. for the quarters during the year ended December 31, 2013, is shown below (in thousands) and includes all normal recurring adjustments that management considers necessary for fair presentation:
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	Total revenues	$	171,232		$	161,422		$	181,831		$	252,717		$	767,202
	Total expenses	160,937			153,257			174,140			250,757			739,091
	Earnings from equity method investments	3,453			3,451			3,527			7,140			17,571
	Operating income	13,748			11,616			11,218			9,100			45,682
	Other expenses, net	1,754			2,482			1,873			2,058			8,167
	Net income	11,994			9,134			9,345			7,042			37,515
	Less: net income attributable to noncontrolling interests	—			—			—			1,256			1,256
	Net income attributable to Rose Rock Midstream, L.P.	$	11,994		$	9,134		$	9,345		$	5,786		$	36,259
	Earnings (loss) per limited partner unit
	Common unit (basic)	$	0.59		$	0.44		$	0.45		$	0.26		$	1.66
	Common unit (diluted)	$	0.59		$	0.44		$	0.45		$	0.26		$	1.66
	Subordinated unit (basic and diluted)	$	0.57		$	0.44		$	0.37		$	0.24		$	1.59
	Class A unit (basic and diluted)	$	0.16		$	—		$	(0.08	)	$	(0.38	)	$	(0.39	)

Overview_Policies

Overview (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation, Policy [Policy Text Block]	Basis of presentation
	These consolidated financial statements include the accounts of Rose Rock and its controlled subsidiaries and have been revised to reflect the impact of a common control acquisition. On February 13, 2015, we completed the acquisition of the WOT and a 50% interest in Glass Mountain Pipeline, LLC from SemGroup (Note 3). The acquisition of WOT created a change in reporting entity, which required our historical results to be revised as if WOT had been part of Rose Rock in prior periods. The accompanying historical financial statements and related notes to the consolidated financial statements have been revised to reflect this change. Prior period earnings of WOT have been allocated to the general partner. Thus, there is no change in the total amount of historical earnings attributed to common unitholders.
	These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States. All significant transactions between Rose Rock and its consolidated subsidiaries have been eliminated. Our ownership interest in White Cliffs is reflected as an equity method investment as the other owners have substantive rights to participate in the management of White Cliffs.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Use of Estimates	USE OF ESTIMATES – 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. Our significant estimates include, but are not limited to: (1) allowances for doubtful accounts receivable; (2) estimated useful lives of assets, which impacts depreciation; (3) estimated fair values of long-lived assets used in impairment tests; (4) fair values of derivative instruments; (5) valuation of goodwill and other intangible assets; and (6) accrual and disclosure of contingent losses. Although management believes these estimates are reasonable, actual results could differ materially from these estimates.
Cash and Cash Equivalents	CASH AND CASH EQUIVALENTS—Cash includes currency on hand and demand and time deposits with banks or other financial institutions. Cash equivalents include highly liquid investments with maturities of three months or less at the date of purchase. Balances at financial institutions may exceed federally insured limits.
Accounts Receivable	ACCOUNTS RECEIVABLE – Accounts receivable are reported net of the allowance for doubtful accounts. Our assessment of the allowance for doubtful accounts is based on several factors, including the overall creditworthiness of our customers, existing economic conditions, and the amount and age of past due accounts. We enter into netting arrangements with certain counterparties to help mitigate credit risk. Receivables subject to netting are presented as gross receivables (with the related accounts payable also presented gross) until such time as the balances are settled. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are written off against the allowance for doubtful accounts only after all collection attempts have been exhausted. The allowance for doubtful accounts was $0 at December 31, 2014 and 2013.
Inventories	INVENTORIES – Inventories primarily consist of crude oil. Inventories are valued at the lower of cost or market, with cost generally determined using the weighted-average method. The cost of inventory includes applicable transportation costs. During the year ended December 31, 2014, we recorded non-cash charges of $5.7 million to write-down inventory to the lower of cost or market.
	We enter into exchanges with third parties whereby we acquire products that differ in location, grade, or delivery date from products we have available for sale. These exchanges are valued at cost, and although a transportation, location or product differential may be recorded, generally no gain or loss is recognized.
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT – Property, plant and equipment is recorded at cost. We capitalize costs that extend or increase the future economic benefits of property, plant and equipment, and expense maintenance costs that do not. When assets are disposed of, their cost and related accumulated depreciation are removed from the balance sheet, and any resulting gain or loss is recorded within operating expenses in the consolidated statements of income.
	Depreciation is calculated primarily on the straight-line method over the following estimated useful lives:
	Pipelines and related facilities	20 years
	Storage and terminal facilities	10 –25 years
	Trucking equipment and other	3 – 7 years
	Construction in process is reclassified to the fixed asset categories above and depreciation commences once the asset has been placed in-service.
Linefill	LINEFILL – Pipelines and storage facilities generally require a minimum volume of product in the system to enable the system to operate. Such product, known as linefill, is generally not available to be withdrawn from the system. Linefill owned by us in facilities operated by us is recorded at historical cost, is included in property, plant and equipment in the consolidated balance sheets, and is not depreciated. We also own linefill in third-party facilities, which is included in inventory on the consolidated balance sheets.
Impairment of Long-Lived Assets	IMPAIRMENT OF LONG-LIVED ASSETS – We test long-lived asset groups for impairment when events or circumstances indicate that the net book value of the asset group may not be recoverable. We test an asset group for impairment by estimating the undiscounted cash flows expected to result from its use and eventual disposition. If the estimated undiscounted cash flows are lower than the net book value of the asset group, we then estimate the fair value of the asset group and record a reduction to the net book value of the assets and a corresponding impairment loss.
Goodwill	GOODWILL — We test goodwill for impairment on an annual basis, or more often if circumstances warrant, by estimating the fair value of the asset group to which the goodwill relates and comparing this fair value to the net book value of the asset group. If fair value is less than net book value, we estimate the implied fair value of goodwill, reduce the book value of the goodwill to the implied fair value, and record a corresponding impairment loss. Our policy is to test goodwill for impairment on October 1st of each year.
Intangible Assets	INTANGIBLE ASSETS — Intangible assets are stated at cost, net of accumulated amortization, which is recorded on a straight-line basis over the life of the asset. We review amortizable intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. If such a review should indicate that the carrying amount of amortizable intangible assets is not recoverable, we reduce the carrying amount of such assets to fair value.
Equity Method Investments	EQUITY METHOD INVESTMENTS — We account for an investment under the equity method when we have significant influence over, but not control of, the significant operating decisions of the investee. Under the equity method, we record in the consolidated statements of income our share of the earnings or losses of the investee, with a corresponding adjustment to the investment balance on our consolidated balance sheet. When we receive a distribution from an equity method investee, we record a corresponding reduction to the investment balance.
Debt Issuance Costs	DEBT ISSUANCE COSTS — Costs incurred in connection with the issuance of long-term debt are reported as other noncurrent assets and are amortized to interest expense using the straight-line method over the term of the related debt. Use of the straight-line method of amortization does not differ materially from the “effective interest” method.
Commodity Derivative Instruments	COMMODITY DERIVATIVE INSTRUMENTS – We generally record the fair value of derivative instruments on the consolidated balance sheets and the change in fair value as an increase or decrease to product revenue. As shown in Note 6, the fair value of derivatives at December 31, 2014 and 2013 are recorded to other current assets or other current liabilities on the consolidated balance sheets. Related margin deposits are recorded to other current assets or other current liabilities on the consolidated balance sheets. Margin deposits have not generally been netted against derivative assets or liabilities at December 31, 2014 and 2013.
	The fair value of a derivative contract is determined based on the nature of the transaction and the market in which the transaction was executed. Quoted market prices, when available, are used to value derivative transactions. In situations where quoted market prices are not readily available, we estimate the fair value using other valuation techniques that reflect the best information available under the circumstances. Fair value measurements of derivative assets include consideration of counterparty credit risk. Fair value measurements of derivative liabilities include consideration of our creditworthiness.
	We have elected “normal purchase” and “normal sale” treatment for certain commitments to purchase or sell petroleum products at future dates. This election is only available when a transaction is expected to result in physical delivery of product over a reasonable period in the normal course of business and is not expected to be net settled. Agreements accounted for under this election are not recorded at fair value; instead, the transaction is recorded when the product is delivered.
Contingent Losses	CONTINGENT LOSSES – We record a liability for a contingent loss when it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. We record attorneys’ fees incurred in connection with a contingent loss at the time the fees are incurred. We do not record liabilities for attorneys’ fees that are expected to be incurred in the future.
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS – Asset retirement obligations include legal or contractual obligations associated with the retirement of long-lived assets, such as requirements to incur costs to dispose of equipment or to remediate the environmental impacts of the normal operation of the assets. We record liabilities for asset retirement obligations when a known obligation exists under current law or contract and when a reasonable estimate of the value of the liability can be made.
Revenue Recognition	REVENUE RECOGNITION – Product revenues relate primarily to our marketing business in the Bakken Shale area and to certain fixed-margin transactions related to our pipeline system in Kansas and Oklahoma. The fixed-margin transactions are structured such that we purchase crude oil from a producer or supplier at a designated receipt point at an index price less a transportation fee, and simultaneously sell an identical volume of crude oil at a designated delivery point to the same party at the same index price, thereby locking in a fixed margin that is, in effect, economically equivalent to a transportation fee. Sales of product are recognized at the time title to the product transfers to the purchaser, which typically occurs upon receipt of the product by the purchaser. Any transportation costs we incur to ship product on third-party infrastructure are included in the price of product sold to customers, and are included within product revenues and costs of products sold. Taxes collected from customers and remitted to governmental authorities are recorded on a net basis (excluded from revenue). As described in Note 6, product revenues include realized and unrealized gains and losses on commodity derivatives.
	Under our current operations, fixed-fee service revenues relate primarily to our storage terminal in Cushing, our pipeline system in Kansas and Oklahoma (excluding transactions whereby we take title to the product while it is in our pipeline system, as described above), our WOT pipeline, our crude oil truck unloading facility in Platteville, Colorado and our truck transportation assets. Service revenues are recognized at the time the service is performed.
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers", which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP.
	The standard is effective for annual periods beginning after December 15, 2016, and interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2017.
Costs Of Products Sold	COSTS OF PRODUCTS SOLD — Costs of products sold consists of the cost to purchase the product and any third-party cost incurred to transport the product to the point of sale and to store the product until it is sold.
Purchase and Sales of Inventory with the Same Counterparty	PURCHASES AND SALES OF INVENTORY WITH THE SAME COUNTERPARTY – We routinely enter into transactions to purchase inventory from, and sell inventory to, the same counterparty. Such transactions that are entered into in contemplation of one another are recorded on a net basis.
Income Taxes	INCOME TAXES – We are a partnership for income tax purposes and therefore are not subject to federal or state income taxes. The tax on our net income is borne by the individual partners through the allocation of taxable income. Net income for financial statement purposes may differ significantly from taxable income allocated to our partners because of differences between the tax basis and financial reporting basis of assets and liabilities and the taxable income allocation requirements of our partnership agreement. The aggregate difference in the basis of our net assets for financial and tax reporting purposes cannot be readily determined because information regarding each partner’s tax attributes is not available to us.
Earnings Per Unit	EARNINGS PER 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, which are declared and paid following the close of each quarter.
	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.
Common Control Transactions	COMMON CONTROL TRANSACTIONS – Entities and assets acquired from SemGroup and its affiliates are accounted for as common control transactions whereby the net assets acquired are recorded at their historical amounts. Any consideration in excess of the historical amount is treated as an equity transaction, similar to a dividend, which reduces the partners' equity accounts pro-rata based on their relative ownership percentages. Cash consideration up to the carrying value of net assets acquired is presented as an investing activity in our consolidated statements of cash flows. Cash consideration in excess of the carrying value of net assets acquired is presented as a financing activity.
Noncontrolling Interests In Consolidated Subsidiaries	NONCONTROLLING INTERESTS IN CONSOLIDATED SUBSIDIARIES – Noncontrolling interests represents the ownership interest in our consolidated subsidiary, SemCrude Pipeline, L.L.C. ("SCPL"), which was retained by SemGroup prior to our acquisition of the remaining noncontrolling interest in 2014. Income was allocated to noncontrolling interests pro-rata based on relative ownership interests in SemCrude Pipeline.
Reclassifications	RECLASSIFICATIONS – Certain reclassifications have been made to conform prior year balances to the current year presentation.
Equity-based Compensation	EQUITY-BASED COMPENSATION—We grant certain of our employees equity-based compensation awards which vest contingent on continued service of the recipient. We record compensation expense for these outstanding awards over applicable service periods based on their grant date fair value with a corresponding increase to partners' capital. The expense to be recorded over the life of the awards is discounted for expected forfeitures during the vesting period.
Operating Segment	OPERATING SEGMENT – Our operations are similar in geography, nature of the services we provide, and type of customers we serve. We are managed by SemGroup as one operating segment.
Comprehensive Income	COMPREHENSIVE INCOME – Comprehensive income is defined as a change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources and includes all changes in equity during a period except those resulting from investments by owners and distributions to owners. Rose Rock has no items of comprehensive income, other than net income, in any period presented. Therefore, net income and comprehensive income are the same.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful lives	Depreciation is calculated primarily on the straight-line method over the following estimated useful lives:
	Pipelines and related facilities	20 years
	Storage and terminal facilities	10 –25 years
	Trucking equipment and other	3 – 7 years
	Property, plant and equipment consists of the following (in thousands):
		December 31,			December 31,
		2014			2013
	Land	$	18,479		$	18,453
	Pipelines and related facilities	227,586			213,459
	Storage and terminal facilities	135,466			124,181
	Linefill	25,507			13,866
	Trucking equipment and other	40,281			19,180
	Construction-in-progress	31,393			19,093
	Property, plant and equipment, gross	478,712			408,232
	Accumulated depreciation	(82,646		)	(57,076		)
	Property, plant and equipment, net	$	396,066		$	351,156

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Chesapeake crude oil trucking assets [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	We have recorded the fair value of the assets acquired as follows (in thousands):
	Property, plant and equipment	$	19,092
	Customer contract intangible	17,010
	Goodwill	7,892
	Total assets acquired	$	43,994
Barcas Field Services, LLC [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	We have recorded fair values of the assets acquired as follows (in thousands
	Property, plant and equipment	$	13,865
	Customer contract intangible	6,880
	Goodwill	28,224
	Total assets acquired	$	48,969

Equity_Method_Investment_Table

Equity Method Investment (Tables)	12 Months Ended
	Dec. 31, 2014
Investments in nonconsolidated affiliates [Abstract]
Equity Method Investments, Summarized Financial Information[Table Text Block]	Certain summarized balance sheet information of White Cliffs as of December 31, 2014 and 2013 is shown below (in thousands):
		31-Dec-14		31-Dec-13
	Current assets	$	35,623	$	98,457
	Property, plant and equipment, net	471,179		312,831
	Goodwill	17,000		17,000
	Other intangible assets, net	16,043		20,802
	Total assets	$	539,845	$	449,090
	Current liabilities	$	11,108	$	9,648
	Members’ equity	528,737		439,442
	Total liabilities and members’ equity	$	539,845	$	449,090
	Certain summarized income statement information of White Cliffs for the years ended December 31, 2014 and 2013 is shown below (in thousands):
		Year ended December 31, 2014		Year Ended December 31, 2013
	Revenue	$	160,369	$	133,310
	Operating, general and administrative expenses	$	23,067	$	23,825
	Depreciation and amortization expense	$	23,257	$	18,668
	Net income	$	114,045	$	90,817

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Depreciation is calculated primarily on the straight-line method over the following estimated useful lives:
	Pipelines and related facilities	20 years
	Storage and terminal facilities	10 –25 years
	Trucking equipment and other	3 – 7 years
	Property, plant and equipment consists of the following (in thousands):
		December 31,			December 31,
		2014			2013
	Land	$	18,479		$	18,453
	Pipelines and related facilities	227,586			213,459
	Storage and terminal facilities	135,466			124,181
	Linefill	25,507			13,866
	Trucking equipment and other	40,281			19,180
	Construction-in-progress	31,393			19,093
	Property, plant and equipment, gross	478,712			408,232
	Accumulated depreciation	(82,646		)	(57,076		)
	Property, plant and equipment, net	$	396,066		$	351,156

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The table below summarizes the balances of these assets and liabilities at December 31, 2014 and 2013 (in thousands):
		31-Dec-14										31-Dec-13
		Level 1			Netting*				Total			Level 1		Netting*			Total
	Assets	$	3,198		$	(1,637	)		$	1,561		$	36	$	(36	)	$	—
	Liabilities	1,637			(1,637		)		—			96		(36		)	60
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table sets forth the notional quantities for derivative instruments entered into during the periods indicated (in thousands of barrels):
		Year ended December 31, 2014		Year Ended December 31, 2013			Year Ended December 31, 2012
	Sales	6,641		2,595			1,743
	Purchases	6,477		2,575			1,636
Summarized balance of 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):
	31-Dec-14							31-Dec-13
	Assets			Liabilities				Assets			Liabilities
	$	1,561		$	—			$	—		$	60
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):
	Year Ended			Year Ended				Year Ended
	31-Dec-14			31-Dec-13				31-Dec-12
	$	17,351		$	(1,593	)		$	149

Goodwill_and_other_intangibles1

Goodwill and other intangibles (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]
Schedule of Goodwill [Table Text Block]	Changes in goodwill are shown below (in thousands):
	Balance at December 31, 2012	$	—
	Barcas acquisition (Note 3)	28,322
	Balance at December 31, 2013	28,322
	Oilfield trucking acquisition (Note 3)	7,892
	Barcas purchase price adjustment	(98		)
	Balance at December 31, 2014	$	36,116
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Changes in other intangible assets are shown below (in thousands):
	Balance at December 31, 2012	$	—
	Barcas acquisition	6,930
	Amortization	(1,155		)
	Balance at December 31, 2013	5,775
	Oilfield trucking acquisition	17,010
	Barcas purchase price adjustment	(50		)
	Amortization	(6,095		)
	Balance at December 31, 2014	$	16,640
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	We estimate that future amortization of other intangible assets will be as follows (in thousands):
	For the twelve months ending:
	31-Dec-15	$	1,073
	31-Dec-16	1,881
	31-Dec-17	2,132
	31-Dec-18	2,172
	31-Dec-19	1,680
	Thereafter	7,702
	Total estimated amortization expense	$	16,640

LongTerm_Debt_LongTerm_Debt_Ta

Long-Term Debt Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	Our long-term debt consisted of the following (in thousands):
		December 31,		December 31,
		2014		2013
	5.625% senior unsecured notes	$	400,000	$	—
	Revolving credit facility	32,000		245,000
	Capital leases	132		125
	Total long-term debt	432,132		245,125
	less: current portion of long-term debt	40		37
	Noncurrent portion of long-term debt	$	432,092	$	245,088
Debt Instrument Redemption [Table Text Block]	From and after July 15, 2017, the Partnership may redeem the Notes, in whole or in part, at the redemption prices (expressed as percentages of principal amount) set forth below, plus accrued and unpaid interest, if redeemed during the twelve-month period beginning on July 15 of each of the years indicated below:
	Year		Percentage
	2017		104.22%
	2018		102.81%
	2019		101.41%
	2020 and thereafter		100.00%
Schedule of Maturities of Long-term Debt [Table Text Block]	Scheduled principal payments
	The following table summarizes the scheduled principal payments as of December 31, 2014 (in thousands). As described above, our debt agreements require accelerated principal payments under certain circumstances. As a result, principal payments may occur earlier than shown in the table below.
		Senior Unsecured Notes		Revolving Credit		Capital		Total
				Facility		Leases
	For the year ended:
	31-Dec-15	$	—	$	—	$	40	$	40
	31-Dec-16	—		—		40		40
	31-Dec-17	—		—		26		26
	31-Dec-18	—		32,000		26		32,026
	31-Dec-19	—		—		—		—
	Thereafter	400,000		—		—		400,000
	Total	$	400,000	$	32,000	$	132	$	432,132

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating lease commitments	Future minimum payments required under operating leases that have initial or remaining non-cancellable lease terms in excess of one year at December 31, 2014 are as follows (in thousands):
	For twelve months ending:
	December 31, 2015	$	986
	December 31, 2016	823
	December 31, 2017	617
	December 31, 2018	417
	December 31, 2019	250
	Thereafter	11
	Total future minimum lease payments	$	3,104
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 December 31, 2014, such commitments included the following (in thousands
		Volume		Value
		(barrels)
	Fixed price purchases	13,648		$	1,141,694
	Fixed price sales	13,612		$	1,152,966
	Floating price purchases	7,187		$	373,539
	Floating price sales	7,293		$	389,949

Employee_Benefits_and_EquityBa1

Employee Benefits and Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Unvested Share Activity	We use authorized but unissued units to satisfy our equity-based payment obligations. Although these awards are to be settled in units, we may elect to give participants the option of settling a portion of the awards in cash, to meet statutory minimum tax withholding requirements. The activity related to these awards is summarized below:
		Unvested Units	Average Grant Date Fair Value		Aggregate Fair Value of Units (in thousands)
	Outstanding at December 31, 2011	—	$	—
	Awards granted	46,069	$	21.97
	Awards vested	—	$	—	$	—
	Awards forfeited	-2,109	$	20.6
	Outstanding at December 31, 2012	43,960	$	21.91
	Awards granted	49,104	$	34.41
	Awards vested	-9,333	$	27.25	$	254
	Awards forfeited	-783	$	34.4
	Outstanding at December 31, 2013	82,948	$	28.59
	Awards granted	46,536	$	41.35
	Awards vested	-5,712	$	35.87	$	205
	Awards forfeited	-21,432	$	29.82
	Outstanding at December 31, 2014	102,340	$	33.79

Partners_Capital_and_Distribut1

Partners' Capital and Distributions (Tables)	12 Months Ended
	Dec. 31, 2014
Limited Partners' Capital Account [Line Items]
Incentive distribution level	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							$	0.3625	98.00%	2.00%	—	%
	First Target Distribution	above		$	0.3625		up to	$	0.416875	98.00%	2.00%	—	%
	Second Target Distribution	above		$	0.416875		up to	$	0.453125	85.00%	2.00%	13	%
	Third Target Distribution	above		$	0.453125		up to	$	0.54375	75.00%	2.00%	23	%
	Thereafter						above	$	0.54375	50.00%	2.00%	48	%
Distributions paid	The following table shows distributions paid in 2015, 2014, 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
	31-Dec-13		4-Feb-14		14-Feb-14	$0.47
	31-Mar-14		5-May-14		15-May-14	$0.50
	30-Jun-14		4-Aug-14		14-Aug-14	$0.54
	30-Sep-14		4-Nov-14		14-Nov-14	$0.57
	31-Dec-14		3-Feb-15		13-Feb-15	$0.62
	* 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.
Limited partner units outstanding	Changes in our limited partner units are as follows:
		Common			Common		Subordinated		Class A units
		Units -			Units -		Units
		Public			SemGroup
	December 14, 2011 initial public offering	7,000,000			1,389,709		8,389,709		—
	Balance at December 31, 2012	7,000,000			1,389,709		8,389,709		—
	Private placement	2,000,000			—		—		—
	Units issued to SemGroup in SemCrude Pipeline transactions	—			3,000,000		—		2,500,000
	August common unit offering	4,750,000			—		—		—
	Vesting of equity-based compensation awards, including equivalent distributions	9,739			—		—		—
	Balance at December 31, 2013	13,759,739			4,389,709		8,389,709		2,500,000
	Units issued to SemGroup in SemCrude Pipeline transaction	—			2,425,000		—		1,250,000
	Vesting of equity-based compensation awards, including equivalent distributions	5,712			—		—		—
	Balance at December 31, 2014	13,765,451			6,814,709		8,389,709		3,750,000

Earnings_Per_Limited_Partner_U1

Earnings Per Limited Partner Unit (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of basic and diluted earnings	The following tables set forth the computation of basic and diluted earnings per limited partner unit for the years ended December 31, 2014, 2013 and 2012 (in thousands, except per unit data):
		Year Ended December 31, 2014		Year Ended December 31, 2013			Year Ended December 31, 2012
	Net income attributable to Rose Rock Midstream, L.P.	$	55,167	$	36,259		$	23,954
	Less: General partner’s incentive distribution earned (*)	6,698		483			—
	Less: General partner’s 2.0% ownership, including amounts related to WOT revision (Note 1)	1,444		245			479
	Net income allocated to limited partners	$	47,025	$	35,531		$	23,475
	Numerator for basic and diluted earnings per limited partner unit (**):
	Allocation of net income among limited partner interests:
	Net income allocable to common units	$	32,914	$	22,701		$	11,737.50
	Net income allocable to subordinated units	13,912		13,321			11,737.50
	Net income (loss) allocable to Class A units	199		(491		)	—
	Net income allocated to limited partners	$	47,025	$	35,531		$	23,475
	Denominator for basic and diluted earnings per limited partner unit:
	Basic weighted average number of common units outstanding	19,419		13,672			8,390
	Effect of non-vested restricted units	65		36			16
	Diluted weighted average number of common units outstanding	19,484		13,708			8,406
	Basic and diluted weighted average number of subordinated units outstanding	8,390		8,390			8,390
	Basic and diluted weighted average number of Class A units outstanding	3,154		1,264			—
	Earnings (loss) per limited partner unit:
	Common units (basic)	$	1.69	$	1.66		$	1.4
	Common units (diluted)	$	1.69	$	1.66		$	1.4
	Subordinated units (basic and diluted)	$	1.66	$	1.59		$	1.4
	Class A units (basic and diluted)	$	0.06	$	(0.39	)	$	—
	(*) Based on the amount of the distributions declared per common unit related to earnings for the year ended December 31, 2012, our general partner was not entitled to receive incentive distributions for that period.
	(**) 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. Prior to the conversion of the Class A units in January 2015, the Class A units did not participate in cash distributions, but were allocated a proportional share of undistributed earnings. Class A units will receive the declared distribution for the fourth quarter of 2014, as such the fourth quarter distribution is reflected in the earnings attributable to Class A units for the year ended December 31, 2014. As distributions related to the available cash exceeded net income, the Class A units reflect a loss for the year ended December 31, 2013.

Quarterly_Financial_Data_Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Summarized Information on the Consolidated Results of Operations	Summarized information on the unaudited consolidated net income of Rose Rock Midstream, L.P. for the quarters during the year ended December 31, 2014, is shown below (in thousands), includes all normal recurring adjustments that management considers necessary for fair presentation and has been revised due to the WOT acquisition as described in Note 1:
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	Total revenues	$	292,514		$	292,156		$	376,856		$	336,571		$	1,298,097
	Total expenses	284,981			286,650			368,615			331,045			1,271,291
	Earnings from equity method investment	11,080			12,291			16,289			17,718			57,378
	Operating income	18,613			17,797			24,530			23,244			84,184
	Other expenses, net	2,387			2,709			8,010			8,153			21,259
	Net income	16,226			15,088			16,520			15,091			62,925
	Less: net income attributable to noncontrolling interests	3,676			4,082			—			—			7,758
	Net income attributable to Rose Rock Midstream, L.P.	$	12,550		$	11,006		$	16,520		$	15,091		$	55,167
	Earnings (loss) per limited partner unit
	Common unit (basic)	$	0.45		$	0.41		$	0.5		$	0.34		$	1.69
	Common unit (diluted)	$	0.45		$	0.41		$	0.5		$	0.34		$	1.69
	Subordinated unit (basic and diluted)	$	0.45		$	0.37		$	0.5		$	0.34		$	1.66
	Class A unit (basic and diluted)*	$	(0.05	)	$	(0.25	)	$	(0.07	)	$	0.34		$	0.06
	* Class A units converted to common units on January 1, 2015 and were eligible for distributions of fourth quarter 2014 earnings.
	Summarized information on the consolidated net income of Rose Rock Midstream, L.P. for the quarters during the year ended December 31, 2013, is shown below (in thousands) and includes all normal recurring adjustments that management considers necessary for fair presentation:
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	Total revenues	$	171,232		$	161,422		$	181,831		$	252,717		$	767,202
	Total expenses	160,937			153,257			174,140			250,757			739,091
	Earnings from equity method investments	3,453			3,451			3,527			7,140			17,571
	Operating income	13,748			11,616			11,218			9,100			45,682
	Other expenses, net	1,754			2,482			1,873			2,058			8,167
	Net income	11,994			9,134			9,345			7,042			37,515
	Less: net income attributable to noncontrolling interests	—			—			—			1,256			1,256
	Net income attributable to Rose Rock Midstream, L.P.	$	11,994		$	9,134		$	9,345		$	5,786		$	36,259
	Earnings (loss) per limited partner unit
	Common unit (basic)	$	0.59		$	0.44		$	0.45		$	0.26		$	1.66
	Common unit (diluted)	$	0.59		$	0.44		$	0.45		$	0.26		$	1.66
	Subordinated unit (basic and diluted)	$	0.57		$	0.44		$	0.37		$	0.24		$	1.59
	Class A unit (basic and diluted)	$	0.16		$	—		$	(0.08	)	$	(0.38	)	$	(0.39	)

Overview_Details

Overview (Details)	12 Months Ended
	Dec. 31, 2014
	Trucks
	Trailers
Schedule of Overview [Line Items]
Trucks	255
Trailers	275
General partners' interest	2.00%
Wattenberg Oil Trunkline [Member]
Schedule of Overview [Line Items]
Length of pipeline network	75
Width of Pipeline	12
Oklahoma [Member]
Schedule of Overview [Line Items]
Oil storage capacity, barrels	7,600,000
Kansas and Oklahoma [Member]
Schedule of Overview [Line Items]
Oil storage capacity, barrels	630,000
Length of pipeline network	570
Colorado [Member]
Schedule of Overview [Line Items]
Oil storage capacity, barrels	230,000
Length of pipeline network	17
Number of lanes	16
Subordinated Units [Member] | SemGroup [Member]
Schedule of Overview [Line Items]
Limited partner common units	8,389,709
Common Units [Member]
Schedule of Overview [Line Items]
Limited partner common units	20,580,160
Common Units [Member] | SemGroup [Member]
Schedule of Overview [Line Items]
Limited partner common units	6,814,709
Capital Unit, Class A [Member] | SemGroup [Member]
Schedule of Overview [Line Items]
Limited partner common units	3,750,000
Glass Mountain Pipeline Llc [Member]
Schedule of Overview [Line Items]
Ownership Interest	50.00%
White Cliffs Pipeline L L C [Member]
Schedule of Overview [Line Items]
Length of pipeline network	527
Ownership Interest	51.00%
Width of Pipeline	12
White Cliffs Pipeline L L C [Member] | SemCrude Pipeline [Member]
Schedule of Overview [Line Items]
Ownership Interest	51.00%

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Allowance for Doubtful Accounts Receivable	$0	$0
Property, Plant and Equipment [Line Items]
Inventory Write-down	$5,667,000	$0	$0
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Storage and terminal facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Storage and terminal facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Trucks and other property and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Trucks and other property and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years

Acquisitions_Details

Acquisitions (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 23, 2014	Sep. 02, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$36,116	$28,322	$0
Chesapeake crude oil trucking assets [Member]
Business Acquisition [Line Items]
Property, plant and equipment				19,092
Customer contract intangible acquired				17,010
Goodwill				7,892
Total assets acquired				43,994
Barcas Field Services, LLC [Member]
Business Acquisition [Line Items]
Property, plant and equipment					13,865
Customer contract intangible acquired					6,880
Goodwill					28,224
Total assets acquired					$48,969

Acquisitions_Details_Textual

Acquisitions (Details Textual) (USD $)

0 Months Ended

12 Months Ended

0 Months Ended

Aug. 14, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jan. 11, 2013

Jun. 24, 2014

Sep. 03, 2013

Jun. 23, 2014

Dec. 16, 2013

Nov. 08, 2013

Feb. 13, 2015

Jun. 19, 2014

Dec. 11, 2013

Sep. 01, 2013

Trucks

Trailers

Business Acquisition [Line Items]

General partners' interest

2.00%

Share Price

$45.45

Contributions to general partners account

$21,547,000

$25,398,000

$12,230,000

Payments to acquire interest in SemCrude Pipeline

54,930,000

31,832,000

0

Goodwill, Purchase Accounting Adjustments

-100,000

Tampa pipeline acquisition price

61,282,000

51,560,000

40,616,000

Common units issued to public

4,750,000

0

Common Units [Member]

Business Acquisition [Line Items]

Share Price

$29.63

$49.49

$36.30

Units issued in private placement

2,000,000

Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Units [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

120,000,000

Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

58,600,000

58,600,000

Chesapeake crude oil trucking assets [Member]

Business Acquisition [Line Items]

Payments to acquire businesses

44,000,000

Trucks purchased

124

Trailers purchased

122

Estimated probability of contract renewal

95.00%

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment

-2,600,000

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles

12,600,000

Goodwill, Purchase Accounting Adjustments

-10,000,000

Initial Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

30,500,000

Second Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

39,600,000

SemCrude Pipeline Acquisition Transactions [Member]

Business Acquisition [Line Items]

Transaction related costs

4,100,000

Limited partner unit issuance costs offset against proceeds

1,600,000

Acquisition costs expensed

900,000

SemCrude Pipeline Acquisition Transactions [Member] | Common Units [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

98,900,000

SemCrude Pipeline Acquisition Transactions [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

70,100,000

Barcas Field Services, LLC [Member]

Business Acquisition [Line Items]

Payments to acquire businesses

48,969,000

Trucks purchased

114

Trailers purchased

120

Estimated probability of contract renewal

50.00%

Goodwill, Purchase Accounting Adjustments

-98,000

Glass Mountain Pipeline Llc [Member]

Business Acquisition [Line Items]

Ownership Interest

50.00%

SemCrude Pipeline [Member] | Acquisition of remaining 33% interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Payments to acquire businesses

114,400,000

SemCrude Pipeline [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Ownership Interest

33.00%

Payments to acquire interest in SemCrude Pipeline

189,500,000

SemCrude Pipeline [Member] | Second Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Ownership Interest

33.00%

Payments to acquire interest in SemCrude Pipeline

173,100,000

White Cliffs Pipeline L L C [Member]

Business Acquisition [Line Items]

Ownership Interest

51.00%

Length of pipeline network

527

White Cliffs Pipeline L L C [Member]

Business Acquisition [Line Items]

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

125,000

Tampa Pipeline [Member]

Business Acquisition [Line Items]

Length of pipeline network

12

Width of pipeline in inches

12

Tampa pipeline acquisition price

8,200,000

SemCrude Pipeline [Member] | White Cliffs Pipeline L L C [Member]

Business Acquisition [Line Items]

Ownership Interest

51.00%

Noncontrolling Interest [Member] | Semgroup [Member] | SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Ownership Interest

33.00%

Revolving Credit Facility [Member]

Business Acquisition [Line Items]

Debt issuance cost

1,600,000

Revolving Credit Facility [Member] | SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Borrowing on line of credit to fund acquisition

130,300,000

General Partner [Member]

Business Acquisition [Line Items]

Contributions to general partners account

21,547,000

25,398,000

12,230,000

General Partner [Member] | Acquisition of remaining 33% interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Contributions to general partners account

3,600,000

General Partner [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Contributions to general partners account

2,700,000

General Partner [Member] | Second Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Contributions to general partners account

1,900,000

General Partner [Member] | SemCrude Pipeline Acquisition Transactions [Member]

Business Acquisition [Line Items]

Contributions to general partners account

4,600,000

Common Units [Member] | Acquisition of remaining 33% interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

120,000,000

Common Units [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

44,400,000

Common Units [Member] | Second Acquisition of 33% Interest in SemCrude Pipeline [Member]

Business Acquisition [Line Items]

Value of units issued as consideration

54,500,000

Partnership Interest [Member] | Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Units [Member]

Business Acquisition [Line Items]

Units issued as consideration

2,425,000

Partnership Interest [Member] | Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,250,000

Partnership Interest [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Units [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,500,000

Partnership Interest [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,250,000

Partnership Interest [Member] | Second Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Units [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,500,000

Partnership Interest [Member] | Second Acquisition of 33% Interest in SemCrude Pipeline [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,250,000

Partnership Interest [Member] | SemCrude Pipeline Acquisition Transactions [Member] | Common Units [Member]

Business Acquisition [Line Items]

Units issued as consideration

3,000,000

Partnership Interest [Member] | SemCrude Pipeline Acquisition Transactions [Member] | Common Class A [Member]

Business Acquisition [Line Items]

Units issued as consideration

2,500,000

Subsequent Event [Member]

Business Acquisition [Line Items]

Common units issued to public

2,300,000

Subsequent Event [Member] | Wattenberg Oil Trunkline and Glass Mountain Pipeline [Member] | Common Units [Member]

Business Acquisition [Line Items]

Units issued as consideration

1,750,000

Common units issued to public

2,300,000

Sale of Stock, Consideration Received on Transaction

89,100,000

Subsequent Event [Member] | Glass Mountain Pipeline Llc [Member]

Business Acquisition [Line Items]

Ownership Interest

50.00%

Semgroup [Member] | Subsequent Event [Member] | Wattenberg Oil Trunkline and Glass Mountain Pipeline [Member]

Business Acquisition [Line Items]

Payments to acquire interest in SemCrude Pipeline

251,200,000

Equity_Method_Investment_Detai

Equity Method Investment (Details) (White Cliffs Pipeline L L C [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
White Cliffs Pipeline L L C [Member]
Equity Method Investment, Summarized Financial Information, Revenue	$160,369	$133,310
Equity Method Investment, Summarized Financial Information, Operating, General and Administrative Expenses	23,067	23,825
Equity Method Investment, Summarized Financial Information, Depreciation and Amortization Expense	23,257	18,668
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	114,045	90,817
Equity Method Investment, Summarized Financial Information, Current Assets	35,623	98,457
Equity Method Investment, Summarized Financial Information, Property Plant And Equipment, Net	471,179	312,831
Equity Method Investment, Summarized Financial Information, Goodwill	17,000	17,000
Equity Method Investment, Summarized Financial Information, Other Intangible Assets, Net	16,043	20,802
Equity Method Investment, Summarized Financial Information, Assets	539,845	449,090
Equity Method Investment, Summarized Financial Information, Current Liabilities	11,108	9,648
Equity Method Investment Summarized Financial Information, Equity	528,737	439,442
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$539,845	$449,090

Equity_Method_Investment_Detai1

Equity Method Investment (Details Textual) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings from equity method investment	$17,718,000	$16,289,000	$12,291,000	$11,080,000	$7,140,000	$3,527,000	$3,451,000	$3,453,000	$57,378,000	$17,571,000	$0
General and administrative expense									19,415,000	15,557,000	12,083,000
Capital contributions to fund White Cliffs pipeline expansion									54,930,000	31,832,000	0
Proceeds from Noncontrolling Interests									14,367,000	0	0
White Cliffs Pipeline L L C [Member]
Earnings from equity method investment									57,400,000	3,800,000
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital									66,800,000	0
Ownership percentage	51.00%								51.00%
SemCrude Pipeline [Member]
Earnings from equity method investment										13,800,000
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital										17,000,000
SemCrude Pipeline [Member] | White Cliffs Pipeline L L C [Member]
Ownership percentage	51.00%								51.00%
White Cliffs Pipeline L L C [Member]
General and administrative expense									1,600,000	1,800,000
White Cliffs Expansion [Member] | White Cliffs Pipeline L L C [Member]
Pipeline capacity	65,000								65,000
White Cliffs Expansion [Member] | White Cliffs Pipeline L L C [Member]
Estimated contributions in 2015 to fund White Cliffs expansion	40,000,000								40,000,000
Pipeline expansion [Member]
Proceeds from Noncontrolling Interests									14,400,000
Pipeline expansion [Member] | White Cliffs Pipeline L L C [Member]
Pipeline capacity	150,000								150,000
Capital contributions to fund White Cliffs pipeline expansion									$53,300,000	$31,800,000
Pipeline expansion [Member] | White Cliffs Pipeline L L C [Member]
Width of pipeline in inches									12

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$478,712	$408,232
Accumulated depreciation	-82,646	-57,076
Property, plant and equipment, net	396,066	351,156
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,479	18,453
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	227,586	213,459
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	135,466	124,181
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,507	13,866
Trucks and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,281	19,180
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$31,393	$19,093

Property_Plant_and_Equipment_P

Property, Plant and Equipment Property, Plant and Equipment (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense	$33.90	$22.60	$12.10
Capitalized interest	$0.30	$0.70	$0

Financial_Instruments_Derivati

Financial Instruments (Derivative Assets and Liabilities) (Details) (Level 1 [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Level 1 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$3,198		$36
Derivative Asset, Fair Value, Gross Liability	1,637	[1]	36	[1]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0		60
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,561		0
Derivative Liability, Fair Value, Gross Liability	1,637		96
Derivative Liability, Fair Value, Gross Asset	$1,637	[1]	$36	[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_Derivati1

Financial Instruments (Derivative Instruments) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	bbl	bbl	bbl
Sales [Member]
Notional quantities of derivative instruments	6,641,000	2,595,000	1,743,000
Purchases [Member]
Notional quantities of derivative instruments	6,477,000	2,575,000	1,636,000

Financial_Instruments_Current_

Financial Instruments (Current Derivative Assets and Liabilities) (Details) (Not Designated as Hedging Instrument [Member], Commodity Contract [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets [Member]
Fair value of commodity derivative assets and liabilities
Assets	$1,561	$0
Liabilities [Member]
Fair value of commodity derivative assets and liabilities
Liabilities	$0	$60

Financial_Instruments_Commodit

Financial Instruments (Commodity Derivatives) (Details) (Product revenue [Member], Commodity Contract [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product revenue [Member] | Commodity Contract [Member]
Realized and unrealized gains (losses) from commodity derivatives
Commodity contracts	$17,351	($1,593)	$149

Financial_Instruments_Details_

Financial Instruments (Details Textual) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Level 2 and level 3 fair value transactions									$0	$0	$0
Margin Deposit Assets	800,000				800,000				800,000	800,000
Total revenues	336,571,000	376,856,000	292,156,000	292,514,000	252,717,000	181,831,000	161,422,000	171,232,000	1,298,097,000	767,202,000	620,417,000
Revenue [Member]
Concentration Risk [Line Items]
Total revenues									964,000,000
Cost of products sold [Member]
Concentration Risk [Line Items]
purchases of product									622,000,000
Customer Concentration Risk [Member] | Revenue [Member]
Concentration Risk [Line Items]
Number of Customers									2
Concentration percentage									74.00%
Customer Concentration Risk [Member] | Cost of products sold [Member]
Concentration Risk [Line Items]
Concentration percentage									55.00%
Number of Suppliers									2
Customer Concentration Risk [Member] | Accounts receivable [Member]
Concentration Risk [Line Items]
Number of Customers									2
Concentration percentage									53.00%
Commodity Contract [Member]
Concentration Risk [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$2,400,000				$800,000				$2,400,000	$800,000

Goodwill_and_other_intangibles2

Goodwill and other intangibles (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 02, 2013	Jun. 23, 2014
Goodwill [Line Items]
Goodwill	$28,322		$0
Goodwill, Purchase Accounting Adjustments	-100
Goodwill	36,116		0
Barcas Field Services, LLC [Member]
Goodwill [Line Items]
Goodwill				28,224
Goodwill, Acquired During Period		28,322
Goodwill, Purchase Accounting Adjustments	-98
Goodwill				28,224
Chesapeake crude oil trucking assets [Member]
Goodwill [Line Items]
Goodwill					7,892
Goodwill, Acquired During Period	7,892
Goodwill, Purchase Accounting Adjustments	-10,000
Goodwill					$7,892

Goodwill_and_other_intangibles3

Goodwill and other intangibles (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net	$5,775	$0
Amortization	-6,095	-1,155
Other intangible assets, net	16,640	5,775
Barcas Field Services, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		6,930
Finite-Lived Intangible Assets, Purchase Accounting Adjustments	-50
Chesapeake crude oil trucking assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$17,010

Goodwill_and_other_intangibles4

Goodwill and other intangibles (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Goodwill And Other Intangible Assets [Abstract]
Estimated amortization expense in next twelve months	$1,073
Estimated amortization expense in year two	1,881
Estimated amortization expense year three	2,132
Estimated amortization expense year four	2,172
Estimated amortization expense year five	1,680
Estimated amortization expense after year five	7,702
Total future amortization expense	$16,640	$5,775	$0

Goodwill_and_other_intangibles5

Goodwill and other intangibles (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 23, 2014	Sep. 02, 2013
Goodwill [Line Items]
Level 2 and level 3 fair value transactions	$0	$0	$0
Goodwill	36,116,000	28,322,000	0
Chesapeake crude oil trucking assets [Member]
Goodwill [Line Items]
Acquired intangible assets	17,010,000
Goodwill				7,892,000
Chesapeake crude oil trucking assets [Member] | Customer Contracts [Member]
Goodwill [Line Items]
Acquired intangible assets	17,010,000
Finite-Lived Intangible Asset, Useful Life	20 years
Barcas Field Services, LLC [Member]
Goodwill [Line Items]
Acquired intangible assets		6,930,000
Goodwill					$28,224,000

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)	Dec. 31, 2014	Jul. 02, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Senior Notes	$400,000	$400,000	$0
Amount outstanding	32,000		245,000
Capital lease obligations	132		125
Debt and Capital Lease Obligations	432,132		245,125
Long-term Debt and Capital Lease Obligations, Current	40		37
Long-term Debt and Capital Lease Obligations	$432,092		$245,088

LongTerm_Debt_Details_2

Long-Term Debt (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	40
Long-term Debt, Maturities, Repayments of Principal in Year Two	40
Long-term Debt, Maturities, Repayments of Principal in Year Three	26
Long-term Debt, Maturities, Repayments of Principal in Year Four	32,026
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	400,000
Debt and Capital Lease Obligations	432,132	245,125
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	400,000
Debt and Capital Lease Obligations	400,000
Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	104.22%
Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	102.81%
Senior Notes [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.41%
Senior Notes [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	32,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	0
Debt and Capital Lease Obligations	32,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	40
Long-term Debt, Maturities, Repayments of Principal in Year Two	40
Long-term Debt, Maturities, Repayments of Principal in Year Three	26
Long-term Debt, Maturities, Repayments of Principal in Year Four	26
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	0
Debt and Capital Lease Obligations	132

LongTerm_Debt_Details_Textual

Long-Term Debt (Details Textual) (USD $)	0 Months Ended	12 Months Ended
	Jul. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long Term Debt (Textual) [Abstract]
Maximum incremental borrowing increases		$200,000,000
Amount outstanding		32,000,000	245,000,000
Noncurrent capital lease obligations		92,000
Capital lease obligations		132,000	125,000
Senior Notes Redemable Prior to July15, 2017		35.00%
Senior Notes	400,000,000	400,000,000	0
Proceeds from Issuance of Senior Long-term Debt	391,900,000
Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Credit facility capacity		585,000,000
Amount outstanding		32,000,000
Interest Expense, Debt		9,000,000	8,700,000	1,900,000
Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Commitment fee on unused capacity		0.50%
Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Commitment fee on unused capacity		0.38%
Minimum EBITDA to interest expense ratio [Member]
Long Term Debt (Textual) [Abstract]
Line of credit facility, covenant terms		2.5
Maximum net debt to EBITDA ratio [Member]
Long Term Debt (Textual) [Abstract]
Line of credit facility, covenant terms		5.5
Maximum senior secured debt to EBITDA ratio [Member]
Long Term Debt (Textual) [Abstract]
Line of credit facility, covenant terms		3.5
Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage		5.63%
Interest Expense, Debt		11,700,000
Bilateral Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Outstanding letters of credit		67,600,000
Interest rate at period end		1.75%
Eurodollar Rate Borrowings [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Amount outstanding		20,000,000
Debt Instrument, Interest Rate, Effective Percentage		2.74%
Alternate Base Rate Borrowings [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Amount outstanding		12,000,000
Debt Instrument, Interest Rate, Effective Percentage		4.75%
Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument annual administrative fee		100,000
Letter of Credit [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Interest rate		3.00%
Letter of Credit [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Interest rate		1.75%
Letter of Credit [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Credit facility capacity		150,000,000
Outstanding letters of credit		17,500,000
Interest rate at period end		2.50%
Fronting fee percentage on outstanding letter of credit		0.25%
Eurodollar [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		3.00%
Eurodollar [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Base Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Base Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		0.75%
Other Noncurrent Assets [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		3,800,000
Other Noncurrent Assets [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		8,000,000
Redemption prior to June 15, 2016 [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument redemption premium		1.00%
Basis point adjustment to discount rate		50
Redemption prior to June 15, 2016 [Member] | Senior Notes [Member] | sale of stock [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Redemption Price, Percentage		105.63%
Redemption prior to June 15, 2016 [Member] | Senior Notes [Member] | Change of control [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Redemption Price, Percentage		101.00%
Fair Value, Inputs, Level 1 [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Long-term Debt, Fair Value		$368,000,000

Commitments_and_Contingencies_1

Commitments and Contingencies (Operating Leases) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
31-Dec-15	$986
31-Dec-16	823
31-Dec-17	617
31-Dec-18	417
31-Dec-19	250
Thereafter	11
Total future minimum lease payments	$3,104

Commitments_and_Contingencies_2

Commitments and Contingencies (Purchase and sale commitments) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	bbl
Floating Price Sales [Member]
Purchase and sale commitments
Sales volume (in barrels)	7,293,000
Sales value	$389,949
Fixed Price Sales [Member]
Purchase and sale commitments
Sales volume (in barrels)	13,612,000
Sales value	1,152,966
Floating Price Purchases [Member]
Purchase and sale commitments
Purchases volume (in barrels)	7,187,000
Purchases value	373,539
Fixed Price Purchases [Member]
Purchase and sale commitments
Purchases volume (in barrels)	13,648,000
Purchases value	$1,141,694

Commitments_and_Contingencies_3

Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 11, 2013	Aug. 18, 2011
	sites			bbl	bbl
Loss Contingencies [Line Items]
Barrels of crude oil claimed to be owed					141,000
Barrels of crude oil determined to be missing				148,000
Legal proceedings number of sites	5
Number of sites with limited soil contamination	3
Number of sites with ground water contamination	3
Sites for which closure is anticipated in 2015	3
Number of sites closed	1
Site contingency, number of sites remaining open	4
Commitments and Contingencies (Textual) [Abstract]
Operating Leases, Rent Expense	$1.50	$1.20	$1
Minimum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice Period For Cancellation Of Commitment	30 days
Maximum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice Period For Cancellation Of Commitment	120 days

Employee_Benefits_and_EquityBa2

Employee Benefits and Equity-Based Compensation (Awards Activity) (Details) (Equity Incentive Plan [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning (in shares)	82,948	43,960	0
Awards granted (in shares)	46,536	49,104	46,069
Awards vested (in shares)	-5,712	-9,333	0
Awards forfeited (in shares)	-21,432	-783	-2,109
Ending (in shares)	102,340	82,948	43,960
Beginning (in dollars per share)	$28.59	$21.91	$0
Awards granted (in dollars per share)	$41.35	$34.41	$21.97
Awards vested (in dollars per share)	$35.87	$27.25	$0
Total fair value of awards vested during the period	$205	$254	$0
Awards forfeited (in dollars per share)	$29.82	$34.40	$20.60
Ending (in dollars per share)	$33.79	$28.59	$21.91

Employee_Benefits_and_EquityBa3

Employee Benefits and Equity-Based Compensation (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2015	Dec. 08, 2011
	UnitAwards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense not yet recognized	$1,800,000
Weighted average recognition period for compensation expense	19 months
Shares issued based on unit distribution rights vested during period	0	406
Unvested unit distributions	2,835
Unvested unit distributions per unit (in dollars per unit)	$45.45
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	5,712	9,333	0
Common units reserved					840,000
Compensation expense	900,000	800,000	300,000
SemGroup Stock Based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,100,000	700,000	600,000
SemGroup [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	360
SemGroup Defined Contribution Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Contribution Plan, Cost Recognized	900,000	400,000	300,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation				10,537
Shares issued based on unit distribution rights vested during period				3,335
Subsequent Event [Member] | Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				25,745
Equity settled UUD [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested unit distributions value	129,000
Cash settled UUD [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested unit distributions value	$177,000

Partners_Capital_and_Distribut2

Partners' Capital and Distributions (Distribution rights) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Minimum Quarterly Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.36
Marginal percentage interest in distributions	0.00%
First Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	0.00%
Second Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	13.00%
Third Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	23.00%
Thereafter [Member]
Incentive distribution level
Marginal percentage interest in distributions	48.00%
Maximum [Member] | First Target Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.42
Maximum [Member] | Second Target Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.45
Maximum [Member] | Third Target Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.54
Minimum [Member] | Second Target Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.42
Minimum [Member] | Third Target Distribution [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.45
Minimum [Member] | Thereafter [Member]
Incentive distribution level
Quarterly distribution per unit target amount (in dollars per share)	$0.54
Unitholders [Member] | Minimum Quarterly Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	98.00%
Unitholders [Member] | First Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	98.00%
Unitholders [Member] | Second Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	85.00%
Unitholders [Member] | Third Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	75.00%
Unitholders [Member] | Thereafter [Member]
Incentive distribution level
Marginal percentage interest in distributions	50.00%
General Partner Interest [Member] | Minimum Quarterly Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | First Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Second Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Third Target Distribution [Member]
Incentive distribution level
Marginal percentage interest in distributions	2.00%
General Partner Interest [Member] | Thereafter [Member]
Incentive distribution level
Marginal percentage interest in distributions	2.00%

Partners_Capital_and_Distribut3

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

0 Months Ended

12 Months Ended

0 Months Ended

Feb. 13, 2012

Dec. 31, 2014

15-May-12

Aug. 14, 2012

Nov. 14, 2012

Feb. 14, 2013

15-May-13

Aug. 14, 2013

Nov. 14, 2013

Feb. 14, 2014

15-May-14

Aug. 14, 2014

Nov. 14, 2014

Feb. 13, 2015

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

Limited Partners' Capital Account [Line Items]

Date of record

3-Feb-12

Distribution date

13-Feb-12

Distribution per unit

$0.07

[1]

Distribution of Q1 2012 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

7-May-12

Distribution date

15-May-12

Distribution per unit

$0.37

Distribution of Q2 2012 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

6-Aug-12

Distribution date

14-Aug-12

Distribution per unit

$0.38

Distribution of Q3 2012 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

5-Nov-12

Distribution date

14-Nov-12

Distribution per unit

$0.39

Distribution of Q4 2012 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

4-Feb-13

Distribution date

14-Feb-13

Distribution per unit

$0.40

Distribution of Q1 2013 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

6-May-13

Distribution date

15-May-13

Distribution per unit

$0.43

Distribution of Q2 2013 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

5-Aug-13

Distribution date

14-Aug-13

Distribution per unit

$0.44

Distribution of Q3 2013 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

5-Nov-13

Distribution date

14-Nov-13

Distribution per unit

$0.45

Distribution of Q4 2013 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

4-Feb-14

Distribution date

14-Feb-14

Distribution per unit

$0.47

Distribution of Q1 2014 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

5-May-14

Distribution date

15-May-14

Distribution per unit

$0.50

Distribution of Q2 2014 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

4-Aug-14

Distribution date

14-Aug-14

Distribution per unit

$0.54

Distribution of Q3 2014 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

4-Nov-14

Distribution date

14-Nov-14

Distribution per unit

$0.57

Subsequent Event [Member] | Distribution of Q4 2014 earnings [Member]

Limited Partners' Capital Account [Line Items]

Date of record

3-Feb-15

Distribution date

13-Feb-15

Distribution per unit

$0.62

[1]

* 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.

Partners_Capital_and_Distribut4

Partners' Capital and Distributions (Common Units) (Details)	0 Months Ended	12 Months Ended
	Aug. 14, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 14, 2011
Limited Partners' Capital Account [Line Items]
Common units issued to public	4,750,000	0
Subordinated Units [Member]
Limited Partners' Capital Account [Line Items]
Limited partner units outstanding			8,389,709	8,389,709	8,389,709
Common units issued to public				0
Units issued in private placement				0
Units issued to SemGroup in SemCrude Pipeline transactions			0	0
Vesting of share-based compensation			0	0
Limited partner units outstanding			8,389,709	8,389,709	8,389,709
Class A unitholder [Member]
Limited Partners' Capital Account [Line Items]
Limited partner units outstanding			2,500,000	0	0
Common units issued to public				0
Units issued in private placement				0
Units issued to SemGroup in SemCrude Pipeline transactions			1,250,000	2,500,000
Vesting of share-based compensation			0	0
Limited partner units outstanding			3,750,000	2,500,000	0
Common Units Public [Member]
Limited Partners' Capital Account [Line Items]
Limited partner units outstanding			13,759,739	7,000,000	7,000,000
Common units issued to public				4,750,000
Units issued in private placement				2,000,000
Units issued to SemGroup in SemCrude Pipeline transactions			0	0
Vesting of share-based compensation			5,712	9,739
Limited partner units outstanding			13,765,451	13,759,739	7,000,000
Common Units SemGroup [Member]
Limited Partners' Capital Account [Line Items]
Limited partner units outstanding			4,389,709	1,389,709	1,389,709
Common units issued to public				0
Units issued in private placement				0
Units issued to SemGroup in SemCrude Pipeline transactions			2,425,000	3,000,000
Vesting of share-based compensation			0	0
Limited partner units outstanding			6,814,709	4,389,709	1,389,709

Partners_Capital_and_Distribut5

Partners' Capital and Distributions (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
	Aug. 14, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 11, 2013	Feb. 13, 2015	Jan. 02, 2015	Feb. 17, 2015	Jun. 19, 2014	Dec. 11, 2013
Investments in and Advances to Affiliates [Line Items]
Percentage of ownership general partner interest		2.00%
Percentage of limited partner voting interest required to remove general partner		66.66%
Common units issued to public	4,750,000			0
Proceeds from common L.P. unit issuance, net of offering costs	$152,500,000	$0	$210,226,000	$0
Equity issuance costs	6,400,000
Share Price		$45.45
Contributions from general partner	3,242,000	21,547,000	28,640,000	12,230,000
Subordinated Unitholders [Member]
Investments in and Advances to Affiliates [Line Items]
Common units issued to public			0
Units issued in private placement			0
Common Units Public [Member]
Investments in and Advances to Affiliates [Line Items]
Common units issued to public			4,750,000
Units issued in private placement			2,000,000
Minimum Quarterly Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.36
Marginal percentage interest in distributions		0.00%
Minimum Quarterly Distribution [Member] | Subordinated Unitholders [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		98.00%
Minimum Quarterly Distribution [Member] | Common unit [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		98.00%
Minimum Quarterly Distribution [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
First Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		0.00%
First Target Distribution [Member] | Common unit [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		98.00%
First Target Distribution [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
Second Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		13.00%
Second Target Distribution [Member] | Common unit [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		85.00%
Second Target Distribution [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
Third Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		23.00%
Third Target Distribution [Member] | Common unit [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		75.00%
Third Target Distribution [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
Thereafter [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		48.00%
Thereafter [Member] | Common unit [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		50.00%
Thereafter [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
Cash Distribution [Member] | General Partner Interest [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		2.00%
Common Units [Member]
Investments in and Advances to Affiliates [Line Items]
Units issued in private placement					2,000,000
Share Price					$29.63				$49.49	$36.30
Proceeds from Issuance of Private Placement					59,300,000
Maximum [Member] | First Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.42
Maximum [Member] | Second Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.45
Maximum [Member] | Third Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.54
Maximum [Member] | Cash Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Marginal percentage interest in distributions		48.00%
Minimum [Member] | Second Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.42
Minimum [Member] | Third Target Distribution [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.45
Minimum [Member] | Thereafter [Member]
Investments in and Advances to Affiliates [Line Items]
Quarterly distribution per unit target amount (in dollars per share)		$0.54
Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Common units issued to public						2,300,000
Proceeds from common L.P. unit issuance, net of offering costs						$89,100,000
Subsequent Event [Member] | Common Class A [Member]
Investments in and Advances to Affiliates [Line Items]
Limited partners' capital account, units converted to common							3,750,000
Subsequent Event [Member] | Subordinated Units [Member]
Investments in and Advances to Affiliates [Line Items]
Limited partners' capital account, units converted to common								8,389,709
SemCrude Pipeline [Member] | Initial Acquisition of 33% Interest in SemCrude Pipeline [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership percentage					33.00%
Glass Mountain Pipeline Llc [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership percentage		50.00%
Glass Mountain Pipeline Llc [Member] | Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership percentage		50.00%

Earnings_Per_Limited_Partner_U2

Earnings Per Limited Partner Unit (Details) (USD $)	3 Months Ended								12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Limited Partners' Capital Account [Line Items]
Net Income (Loss) Attributable to Parent	$15,091,000	$16,520,000	$11,006,000	$12,550,000	$5,786,000	$9,345,000	$9,134,000	$11,994,000	$55,167,000		$36,259,000		$23,954,000
General partners' interest									2.00%
Incentive Distribution, Distribution									6,698,000		483,000		0	[1]
Net income allocated to general partner									8,142,000		728,000		479,000
Net income (loss) allocated to limited partners									47,025,000	[2]	35,531,000	[2]	23,475,000	[2]
Common Units [Member]
Limited Partners' Capital Account [Line Items]
Earnings per limited partner unit, basic	$0.34	$0.50	$0.41	$0.45	$0.26	$0.45	$0.44	$0.59	$1.69		$1.66		$1.40
Earnings per limited partner unit, diluted	$0.34	$0.50	$0.41	$0.45	$0.26	$0.45	$0.44	$0.59	$1.69		$1.66		$1.40
Net income (loss) allocated to limited partners									32,914,000		22,701,000		11,737,500
Basic weighted average number of limited partner units outstanding:									19,419		13,672		8,390
Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment									65		36		16
Weighted Average Limited Partnership Units Outstanding, Diluted									19,484		13,708		8,406
Subordinated Units [Member]
Limited Partners' Capital Account [Line Items]
Earnings per limited partner unit, basic and diluted	$0.34	$0.50	$0.37	$0.45	$0.24	$0.37	$0.44	$0.57	$1.66		$1.59		$1.40
Net income (loss) allocated to limited partners									13,912,000		13,321,000		11,737,500
Basic weighted average number of limited partner units outstanding:									8,390		8,390		8,390
Weighted Average Limited Partnership Units Outstanding, Diluted									8,390		8,390		8,390
Common Class A [Member]
Limited Partners' Capital Account [Line Items]
Earnings per limited partner unit, basic and diluted	$0.34	($0.07)	($0.25)	($0.05)	($0.38)	($0.08)	$0	$0.16	$0.06		($0.39)		$0
Net income (loss) allocated to limited partners									199,000		-491,000		0
Basic weighted average number of limited partner units outstanding:									3,154		1,264		0
Weighted Average Limited Partnership Units Outstanding, Diluted									3,154		1,264		0
Excluding incentive distributions [Member]
Limited Partners' Capital Account [Line Items]
Net income allocated to general partner									$1,444,000		$245,000		$479,000
[1]	(*) Based on the amount of the distributions declared per common unit related to earnings for the year ended December 31, 2012, our general partner was not entitled to receive incentive distributions for that period.
[2]	(**) 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. Prior to the conversion of the Class A units in January 2015, the Class A units did not participate in cash distributions, but were allocated a proportional share of undistributed earnings. Class A units will receive the declared distribution for the fourth quarter of 2014, as such the fourth quarter distribution is reflected in the earnings attributable to Class A units for the year ended December 31, 2014. As distributions related to the available cash exceeded net income, the Class A units reflect a loss for the year ended December 31, 2013.

Earnings_Per_Limited_Partner_U3

Earnings Per Limited Partner Unit (Details Textual)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
General partners' interest	2.00%

Supplemental_Information_State1

Supplemental Information - Statement of Cash Flows (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 23, 2014
Other Significant Noncash Transactions [Line Items]
Contributions	$21,547,000	$25,398,000	$12,230,000
Cash paid for interest	8,500,000	7,200,000	1,200,000
Amounts accrued for purchases of property, plant and equipment	1,200,000	1,500,000	100,000
General Partner [Member]
Other Significant Noncash Transactions [Line Items]
Contributions	21,547,000	25,398,000	12,230,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member]
Other Significant Noncash Transactions [Line Items]
Purchase price in excess of historical cost				206,600,000
Cash consideration in excess of historical cost				24,400,000
Non-cash purchase price in excess of historical cost				182,200,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | General Partner [Member]
Other Significant Noncash Transactions [Line Items]
Contributions				3,600,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Units [Member]
Other Significant Noncash Transactions [Line Items]
Value of units issued as consideration				120,000,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Common Class A [Member]
Other Significant Noncash Transactions [Line Items]
Value of units issued as consideration				58,600,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Partnership Interest [Member] | Common Units [Member]
Other Significant Noncash Transactions [Line Items]
Units issued as consideration				2,425,000
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Partnership Interest [Member] | Common Class A [Member]
Other Significant Noncash Transactions [Line Items]
Units issued as consideration				1,250,000
SemCrude Pipeline Acquisition Transactions [Member]
Other Significant Noncash Transactions [Line Items]
Purchase price in excess of historical cost		414,300,000
Cash consideration in excess of historical cost		240,600,000
Non-cash purchase price in excess of historical cost		173,700,000
SemCrude Pipeline Acquisition Transactions [Member] | General Partner [Member]
Other Significant Noncash Transactions [Line Items]
Contributions		4,600,000
SemCrude Pipeline Acquisition Transactions [Member] | Common Units [Member]
Other Significant Noncash Transactions [Line Items]
Value of units issued as consideration		98,900,000
SemCrude Pipeline Acquisition Transactions [Member] | Common Class A [Member]
Other Significant Noncash Transactions [Line Items]
Value of units issued as consideration		$70,100,000
SemCrude Pipeline Acquisition Transactions [Member] | Partnership Interest [Member] | Common Units [Member]
Other Significant Noncash Transactions [Line Items]
Units issued as consideration		3,000,000
SemCrude Pipeline Acquisition Transactions [Member] | Partnership Interest [Member] | Common Class A [Member]
Other Significant Noncash Transactions [Line Items]
Units issued as consideration		2,500,000
Noncontrolling Interest [Member] | Semgroup [Member] | SemCrude Pipeline [Member]
Other Significant Noncash Transactions [Line Items]
Ownership percentage				33.00%

Related_Party_Transactions_Det

Related Party Transactions (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Semgroup [Member]
Related Party Transactions (Textual) [Abstract]
Direct employee expenses	$34,000,000	$13,500,000	$12,100,000
Allocated expenses	10,700,000	7,300,000	6,400,000
NGL Energy [Member]
Related Party Transactions (Textual) [Abstract]
Revenue	400,300,000	693,200,000	362,700,000
Purchases of inventory	437,000,000	669,400,000	328,600,000
Reimbursement of expense from a related party Transaction	168,000	182,000	0
Sem Gas [Member]
Related Party Transactions (Textual) [Abstract]
Purchases of inventory	37,900,000	24,000,000	10,600,000
White Cliffs Pipeline L L C [Member]
Related Party Transactions (Textual) [Abstract]
Revenue	2,900,000	2,900,000	2,500,000
Expenses from transactions with related party	3,900,000
Glass Mountain Pipeline Llc [Member]
Related Party Transactions (Textual) [Abstract]
Expenses from transactions with related party	800,000
Reimbursement of expense from a related party Transaction	500,000
Conner and Winters [Member]
Related Party Transactions (Textual) [Abstract]
Legal fees and related expenses	100,000	400,000	600,000
White Cliffs Pipeline L L C [Member] | Conner and Winters [Member]
Related Party Transactions (Textual) [Abstract]
Legal fees and related expenses	$100,000	$200,000

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Line Items]
Total revenues	$336,571	$376,856	$292,156	$292,514	$252,717	$181,831	$161,422	$171,232	$1,298,097	$767,202	$620,417
Total expenses	331,045	368,615	286,650	284,981	250,757	174,140	153,257	160,937	1,271,291	739,091	594,482
Earnings from equity method investment	17,718	16,289	12,291	11,080	7,140	3,527	3,451	3,453	57,378	17,571	0
Operating income	23,244	24,530	17,797	18,613	9,100	11,218	11,616	13,748	84,184	45,682	25,935
Other (income) expenses, net	8,153	8,010	2,709	2,387	2,058	1,873	2,482	1,754	21,259	8,167
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15,091	16,520	15,088	16,226	7,042	9,345	9,134	11,994	62,925	37,515	23,954
Less: net income attributable to noncontrolling interests	0	0	4,082	3,676	1,256	0	0	0	7,758	1,256	0
Net income attributable to Rose Rock Midstream, L.P.	$15,091	$16,520	$11,006	$12,550	$5,786	$9,345	$9,134	$11,994	$55,167	$36,259	$23,954
Common Units [Member]
Quarterly Financial Data [Line Items]
Earnings per limited partner unit, basic	$0.34	$0.50	$0.41	$0.45	$0.26	$0.45	$0.44	$0.59	$1.69	$1.66	$1.40
Earnings per limited partner unit, diluted	$0.34	$0.50	$0.41	$0.45	$0.26	$0.45	$0.44	$0.59	$1.69	$1.66	$1.40
Subordinated Units [Member]
Quarterly Financial Data [Line Items]
Earnings per limited partner unit, basic and diluted	$0.34	$0.50	$0.37	$0.45	$0.24	$0.37	$0.44	$0.57	$1.66	$1.59	$1.40
Common Class A [Member]
Quarterly Financial Data [Line Items]
Earnings per limited partner unit, basic and diluted	$0.34	($0.07)	($0.25)	($0.05)	($0.38)	($0.08)	$0	$0.16	$0.06	($0.39)	$0