Semgroup (SEMG) 10-K 26 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Jan. 31, 2016	Jun. 30, 2015
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2,015
Entity Registrant Name	SemGroup Corporation
Entity Central Index Key	1,489,136
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 3,466,750,226
Entity Current Reporting Status	No
Entity Voluntary Filers	No
Class A [Member]
Entity Common Stock, Shares Outstanding		43,932,174
Class B
Entity Common Stock, Shares Outstanding		0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 58,096	$ 40,598
Restricted cash	32	6,980
Accounts receivable (net of allowance of $3,019 and $3,260, respectively)	326,713	351,334
Receivable from affiliates	5,914	16,819
Inventories	70,239	43,532
Other current assets	19,387	20,017
Total current assets	480,381	479,280
Property, plant and equipment (net of accumulated depreciation of $319,769 and $245,629, respectively)	1,566,821	1,256,825
Equity method investments	551,078	577,920
Goodwill	48,032	58,326
Other intangible assets (net of accumulated amortization of $29,515 and $20,545, respectively)	162,223	173,065
Other noncurrent assets, net	62,155	44,386
Total assets	2,870,690	2,589,802
Current liabilities:
Accounts payable	273,666	257,177
Payable to affiliates	5,033	13,460
Accrued liabilities	85,047	92,694
Payables to pre-petition creditors	0	3,129
Deferred revenue	11,349	23,688
Other current liabilities	1,901	1,474
Current portion of long-term debt	31	40
Total current liabilities	377,027	391,662
Long-term debt	1,074,597	767,092
Deferred income taxes	200,953	161,956
Other noncurrent liabilities	$ 21,757	$ 49,655
Commitments and contingencies (Note 16)
SemGroup Corporation owners’ equity:
Common stock, $0.01 par value (authorized - 100,000 shares; issued - 44,863 and 44,689 shares, respectively)	$ 439	$ 436
Additional paid-in capital	1,217,255	1,245,877
Treasury stock, at cost (931 and 862 shares, respectively)	(5,593)	(1,332)
Accumulated deficit	(38,012)	(68,332)
Accumulated other comprehensive loss	(58,562)	(27,141)
Total SemGroup Corporation owners’ equity	1,115,527	1,149,508
Noncontrolling interests in consolidated subsidiaries	80,829	69,929
Total owners’ equity	1,196,356	1,219,437
Total liabilities and owners’ equity	$ 2,870,690	$ 2,589,802

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 3,019	$ 3,260
Accumulated depreciation	319,769	245,629
Accumulated amortization on other intangible assets	$ 29,515	$ 20,545
Par value per share	$ 0.01	$ 0.01
Common stock shares authorized	100,000	100,000
Common stock shares issued	44,863	44,689
Treasury Stock, Shares	931	862

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Product	$ 1,118,886	$ 1,780,314	$ 1,145,104
Service	259,542	233,239	140,198
Other	76,666	109,026	141,714
Total revenues	1,455,094	2,122,579	1,427,016
Expenses:
Costs of products sold, exclusive of depreciation and amortization shown below	979,549	1,623,358	1,020,100
Operating	224,443	246,613	223,585
General and administrative	97,366	87,845	78,597
Depreciation and amortization	100,882	98,397	66,409
Loss (gain) on disposal or impairment, net	11,472	32,592	(239)
Total expenses	1,413,712	2,088,805	1,388,452
Earnings from equity method investments	81,386	64,199	52,477
Gain on issuance of common units by equity method investee	6,385	29,020	26,873
Operating income (loss)	129,153	126,993	117,914
Other expenses (income):
Interest expense	69,675	49,044	25,142
Foreign currency transaction loss (gain)	(1,067)	(86)	(1,633)
Other expense (income), net	(15,801)	(20,536)	45,906
Total other expenses, net	52,807	28,422	69,415
Income from continuing operations before income taxes	76,346	98,571	48,499
Income tax expense (benefit)	33,530	46,513	(17,254)
Income from continuing operations	42,816	52,058	65,753
Income (loss) from discontinued operations, net of income taxes	(4)	(1)	59
Net income	42,812	52,057	65,812
Less: net income attributable to noncontrolling interests	12,492	22,817	17,710
Net income (loss) attributable to SemGroup	30,320	29,240	48,102
Other comprehensive income (loss):
Currency translation adjustments	(32,142)	(20,551)	(6,363)
Other, net of income tax	721	(3,736)	4,808
Total other comprehensive income (loss)	(31,421)	(24,287)	(1,555)
Comprehensive income (loss)	11,391	27,770	64,257
Less: comprehensive income attributable to noncontrolling interests	12,492	22,817	17,710
Comprehensive income (loss) attributable to SemGroup	$ (1,101)	$ 4,953	$ 46,547
Net income attributable to SemGroup per common share (Note 18):
Basic	$ 0.69	$ 0.69	$ 1.14
Diluted	$ 0.69	$ 0.68	$ 1.13

Consolidated Statements of Chan

Consolidated Statements of Changes in Owners' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2012	$ 1,021,528	$ 420	$ 1,039,189	$ (242)	$ (145,674)	$ (1,299)	$ 129,134
Net income (loss)	65,812	0	0	0	48,102	0	17,710
Other comprehensive income (loss), net of income taxes	(1,555)	0	0	0	0	(1,555)	0
Distributions to noncontrolling interests	(17,647)	0	0	0	0	0	(17,647)
Non-cash equity compensation	7,330	0	6,524	0	0	0	806
Warrants exercised	21,379	4	21,375	0	0	0	0
Issuance of common stock under compensation plans	0	1	(1)	0	0	0	0
Repurchase of common stock	(371)	0	0	(371)	0	0	0
Net proceeds from issuance of Rose Rock Midstream, L.P. common units	210,226	0	0	0	0	0	210,226
Transfer to subsidiary in common control transaction	(67,291)	0	112,929	0	0	0	(180,220)
Dividends paid	(25,429)	0	(25,429)	0	0	0	0
Unvested dividend equivalent rights	(119)	0	(71)	0	0	0	(48)
Ending Balance at Dec. 31, 2013	1,213,863	425	1,154,516	(613)	(97,572)	(2,854)	159,961
Net income (loss)	52,057	0	0	0	29,240	0	22,817
Other comprehensive income (loss), net of income taxes	(24,287)	0	0	0	0	(24,287)	0
Distributions to noncontrolling interests	(28,494)	0	0	0	0	0	(28,494)
Non-cash equity compensation	8,262	0	7,319	0	0	0	943
Warrants exercised	73,017	9	73,008	0	0	0	0
Issuance of common stock under compensation plans	2,172	2	2,170	0	0	0	0
Repurchase of common stock	(719)	0	0	(719)	0	0	0
Transfer to subsidiary in common control transaction	(31,930)	0	53,243	0	0	0	(85,173)
Dividends paid	(44,206)	0	(44,206)	0	0	0	0
Unvested dividend equivalent rights	(298)	0	(173)	0	0	0	(125)
Ending Balance at Dec. 31, 2014	1,219,437	436	1,245,877	(1,332)	(68,332)	(27,141)	69,929
Net income (loss)	42,812	0	0	0	30,320	0	12,492
Other comprehensive income (loss), net of income taxes	(31,421)	0	0	0	0	(31,421)	0
Distributions to noncontrolling interests	(40,410)	0	0	0	0	0	(40,410)
Non-cash equity compensation	10,405	0	9,051	0	0	0	1,354
Issuance of common stock under compensation plans	1,515	3	1,512	0	0	0	0
Repurchase of common stock	(4,261)	0	0	(4,261)	0	0	0
Net proceeds from issuance of Rose Rock Midstream, L.P. common units	89,119	0	0	0	0	0	89,119
Transfer to subsidiary in common control transaction	(20,772)	0	30,680	0	0	0	(51,452)
Dividends paid	(69,514)	0	(69,514)	0	0	0	0
Unvested dividend equivalent rights	(554)	0	(351)	0	0	0	(203)
Ending Balance at Dec. 31, 2015	$ 1,196,356	$ 439	$ 1,217,255	$ (5,593)	$ (38,012)	$ (58,562)	$ 80,829

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 42,812	$ 52,057	$ 65,812
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net unrealized (gain) loss related to derivative instruments	2,014	(1,734)	(974)
Depreciation and amortization	100,882	98,397	66,409
Loss (gain) on disposal or impairment, net	11,472	32,592	(216)
Equity earnings from investments	(81,386)	(64,199)	(52,477)
Gain on issuance of common units by equity method investee	(6,385)	(29,020)	(26,873)
Gain on sale of common units of equity method investee	(14,517)	(34,211)	0
Distributions from equity investments	95,429	85,261	63,651
Amortization and write down of debt issuance costs	5,102	3,632	2,732
Deferred tax expense (benefit)	29,197	36,148	(36,274)
Non-cash compensation expense	10,617	8,386	7,330
Excess tax benefit from equity-based awards	0	(1,650)	0
(Gain) loss on fair value of warrants	0	13,423	46,433
Provision for uncollectible accounts receivable, net of recoveries	208	360	(372)
Inventory valuation adjustment	2,590	5,667	0
Currency (gain) loss	(1,067)	(86)	(1,633)
Changes in operating assets and liabilities (Note 22)	(15,206)	(23,365)	39,861
Net cash provided by operating activities	181,762	181,658	173,409
Cash flows from investing activities:
Capital expenditures	(479,530)	(270,506)	(215,609)
Proceeds from sale of long-lived assets	3,688	4,445	1,279
Investments in non-consolidated subsidiaries	(46,730)	(71,131)	(173,868)
Payments to acquire businesses	0	(44,508)	(362,456)
Proceeds from sale of common units of equity method investee	56,318	79,741	0
Distributions from equity method investments in excess of equity in earnings	24,113	11,734	12,246
Net cash provided by (used in) investing activities	(442,141)	(290,225)	(738,408)
Cash flows from financing activities:
Debt issuance costs	(6,289)	(8,686)	(14,936)
Borrowings on debt and other obligations	867,208	1,254,244	1,268,474
Principal payments on debt and other obligations	(560,049)	(1,102,272)	(859,412)
Distributions to noncontrolling interests	(40,410)	(28,494)	(17,647)
Proceeds from warrant exercises	0	1,451	225
Repurchase of common stock	(4,261)	(719)	(371)
Dividends paid	(69,514)	(44,206)	(25,429)
Proceeds from issuance of common stock under employee stock purchase plan	1,223	340	0
Excess tax benefit from equity-based awards	0	1,650	0
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs	89,119	0	210,226
Net cash provided by (used in) financing activities	277,027	73,308	561,130
Effect of exchange rate changes on cash and cash equivalents	850	(3,494)	3,191
Change in cash and cash equivalents	17,498	(38,753)	(678)
Cash and cash equivalents at beginning of period	40,598	79,351	80,029
Cash and cash equivalents at end of period	$ 58,096	$ 40,598	$ 79,351

Overview

Overview	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview	OVERVIEW SemGroup Corporation is a Delaware corporation headquartered in Tulsa, Oklahoma that provides diversified services for end-users and consumers of crude oil, natural gas, natural gas liquids, refined products and asphalt. The accompanying consolidated financial statements include the activities of SemGroup Corporation and its subsidiaries. The terms “we,” “our,” “us,” “the Company” and similar language used in these notes to consolidated financial statements refer to SemGroup Corporation and its subsidiaries. At December 31, 2015, our reportable segments include the following: • Crude Transportation operates crude oil pipelines and truck transportation businesses in the United States. Crude Transportation’s assets include: • a 570 -mile crude oil gathering and transportation pipeline system with over 650,000 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; • 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 pipeline owned by White Cliffs Pipeline, L.L.C. ("White Cliffs"). The WOT has a capacity of approximately 85,000 barrels per day as well as 360,000 barrels of operational storage; • a 16 -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 270 transport trucks and 270 trailers; • Maurepas Pipeline, a project underway to build three pipelines to service refineries in the Gulf Coast region, which is expected to be completed in the fourth quarter of 2016; • a 51% ownership interest in White Cliffs, which owns a 527 -mile pipeline, consisting of two 12 -inch common carrier, crude oil pipelines, that transports crude oil from Platteville, Colorado to Cushing, Oklahoma (the "White Cliffs Pipeline"); and • a 50% ownership interest in Glass Mountain Pipeline, LLC ("Glass Mountain"), which owns a 210 -mile crude oil pipeline in western and north central Oklahoma ("the Glass Mountain Pipeline"). • Crude Facilities operates crude oil storage and terminal businesses in the United States. Crude Facilities assets include: • approximately 7.6 million barrels of crude oil storage capacity in Cushing, Oklahoma, of which 6.5 million barrels are leased to customers and 1.1 million barrels are used for crude oil operations and marketing activities; and • a thirty -lane crude oil truck unloading facility with 350,000 barrels of associated storage capacity in Platteville, Colorado which connects to the origination point of the White Cliffs Pipeline. • Crude Supply and Logistics operates a crude oil marketing business which utilizes our Crude Transportation and Crude Facilities assets for marketing purposes. Additionally, Crude Supply and Logistics' assets include: • approximately 61,800 barrels of crude oil storage capacity in Trenton and Stanley, North Dakota. • SemGas, which provides natural gas gathering and processing services in the United States. SemGas owns and operates gathering systems and four processing plants with 595 million cubic feet per day of capacity. • SemCAMS, which provides natural gas gathering and processing services in Alberta, Canada. SemCAMS owns working interests in, and operates, four natural gas processing plants with a combined operating capacity of 695 million cubic feet per day. • SemLogistics, which provides refined product and crude oil storage services in the United Kingdom. SemLogistics owns a facility in Wales that has multi-product storage capacity of approximately 8.7 million barrels. • SemMexico, which purchases, produces, stores, and distributes liquid asphalt cement products in Mexico. SemMexico operates an in-country network of eleven asphalt cement terminals and modification facilities and two marine terminals. • SemStream, which owns 4,652,568 common units representing 4.4% of the total limited partner interests, as of September 30, 2015, in NGL Energy Partners LP ("NGL Energy") (NYSE: NGL) and an 11.78% interest in the general partner of NGL Energy. We report the results of our investment in NGL Energy under the equity method on a one-quarter lag (Note 5).

Consolidation And Basis Of Pres

Consolidation And Basis Of Presentation	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation and Basis of Presentation	CONSOLIDATION AND BASIS OF PRESENTATION The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States. Consolidated subsidiaries Our consolidated financial statements include the accounts of our controlled subsidiaries, including Rose Rock Midstream, L.P. ("Rose Rock"). All significant transactions between our consolidated subsidiaries have been eliminated. Outside ownership interests in consolidated subsidiaries are reported as noncontrolling interests in the consolidated financial statements. In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis,” which adds requirements that limited partnerships must meet to qualify as voting interest entities and modifies the evaluation of whether limited partnerships are variable interest entities or voting interest entities. It also eliminates the presumption that a general partner should consolidate a limited partnership. This guidance is effective for public companies for fiscal years beginning after December 15, 2015. The Company will adopt this guidance in the first quarter of 2016. The impact is not expected to be material. Proportionally consolidated assets Our SemCAMS segment owns undivided interests in certain natural gas gathering and processing assets, for which we record only our proportionate share of the assets on the consolidated balance sheets. The net book value of the property, plant and equipment recorded by us associated with these undivided interests is approximately $273.0 million at December 31, 2015 . We serve as operator of these facilities and incur the costs of operating the facilities (recorded as operating expenses in the consolidated statements of operations) and charge the other owners for their proportionate share of the costs (recorded as other revenue in the consolidated statements of operations). Equity method investments We own a 51% interest in White Cliffs. The other owners have substantive rights to participate in the management of White Cliffs. Because of this, we account for it under the equity method. In 2014 and 2013, we sold our interest in SemCrude Pipeline, which holds the 51% interest in White Cliffs, to our consolidated subsidiary, Rose Rock. No gain was recorded on these transactions as they were between entities under common control. We own a 50% interest in Glass Mountain which we account for under the equity method. In 2015, we sold our interest in Glass Mountain Holding, LLC, which holds the 50% interest in Glass Mountain, to our consolidated subsidiary Rose Rock. No gain was recorded on the transaction as it was between entities under common control. We own general partner and limited partner interests in NGL Energy which we account for under the equity method.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Signifcant 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 impact depreciation; (3) estimated fair values used in impairment tests; (4) fair values of derivative instruments; (5) valuation allowances for deferred tax 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. RESTRICTED CASH —During the year ended December 31, 2015 , we completed the process of disbursing funds held in reserve accounts to settle pre-petition claims related to our predecessor's bankruptcy. Of the restricted cash balance of $7.0 million at December 31, 2014 , approximately $3.8 million was restricted for this purpose. See "Payables to Pre-petition Creditors" below. 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. INVENTORIES —Inventories primarily consist of crude oil and asphalt. 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. 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. In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory," which requires that inventory within the scope of the guidance be measured at the lower of cost and net realizable value rather than the lower of cost or market. The standard will be effective for public business entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The new guidance shall be applied prospectively and early adoption is permitted. The Company will adopt this guidance in the first quarter of 2017. The impact is not expected to be material. 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 as a gain or loss on disposal or impairment in the consolidated statements of operations. Our SemCAMS segment operates plants which periodically undergo planned major maintenance activities, typically occurring every four to five years. Planned major maintenance projects that do not increase the overall life or capacity of the related assets are recorded in operating expense as incurred, whereas major maintenance activity costs that materially increase the life or capacity of the underlying assets are capitalized. When maintenance expenses are recoverable from the producers who use the plants, they are recorded as revenue, and typically include a 10% overhead fee. Depreciation is calculated primarily on the straight-line method over the following estimated useful lives: Pipelines and related facilities 10 – 31 years Storage and terminal facilities 10 – 25 years Natural gas gathering and processing facilities 10 – 31 years Trucking equipment and other 3 – 7 years Office property and equipment 3 – 31 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 reporting unit to which the goodwill relates and comparing this fair value to the net book value of the reporting unit. 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 1 of each year. INTANGIBLE ASSETS —Intangible assets are stated at cost, net of accumulated amortization, which is recorded on a straight-line or accelerated 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 operations 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. When an equity method investee issues additional ownership interests which dilute our ownership interest, we recognize a gain or loss in our consolidated statements of operations. We assess our equity method investments for impairment when circumstances indicate that the carrying value may not be recoverable and record an impairment when a decline in value is considered to be other than temporary. For equity method investments for which we do not expect financial information to be consistently available on a timely basis to apply the equity method currently, our policy is to apply the equity method consistently on a one-quarter lag. 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. In April 2015, the FASB issued ASU 2015-03, “Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs,” which is designed to simplify presentation of debt issuance costs. The standard requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB issued ASU 2015-15, “Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting,” which amended the SEC paragraphs of ASC Subtopic 835-30 to include the language from the SEC Staff Announcement indicating that the SEC would not object to presenting deferred debt issuance costs related to line-of-credit agreements as assets and subsequently amortizing the deferred debt issuance costs ratably over the term of the agreement. The standards will be effective for U.S. public companies for annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The new guidance shall be applied on a retrospective basis for all periods presented. The Company will adopt this guidance in the first quarter of 2016. The impact is not expected to be material. COMMODITY DERIVATIVE INSTRUMENTS —We generally record the fair value of commodity 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 13, the fair value of commodity derivatives at December 31, 2015 and 2014 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 are not generally netted against derivative assets or liabilities. 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 that would ordinarily meet the definition of a derivative but instead 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. PAYABLES TO PRE-PETITION CREDITORS —During the year ended December 31, 2015 , we completed the process of disbursing funds held in reserve accounts to settle pre-petition claims related to our predecessor's bankruptcy. At December 31, 2014 , we recorded a liability of $3.1 million associated with these obligations and a liability of $0.7 million which is associated with discontinued operations and is reported within other current liabilities. Cash was held in accounts restricted for this purpose which was included in Restricted Cash on the balance sheet. 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 —Sales of product, as well as gathering and marketing revenues, are recognized at the time title to the product transfers to the purchaser, which typically occurs upon receipt of the product by the purchaser. Terminal and storage revenues are recognized at the time the service is performed. Revenue for the transportation of product is recognized upon delivery of the product to its destination. Certain revenue transactions are reported on a net basis, including certain buy/sell transactions (see “Purchases and Sales of Inventory with the Same Counterparty”). Other revenue primarily represents operating cost recovery from working interest owners in certain processing plants and is recorded when earned in accordance with the terms of related agreements. Taxes collected from customers and remitted to governmental authorities are recorded on a net basis (excluded from revenue). In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers," which supersedes nearly all existing revenue recognition guidance under accounting principles generally accepted in the United States ("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 permits 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). In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 by one year. 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. We will adopt this guidance in the first quarter of 2018. COSTS OF PRODUCTS SOLD —Costs of products sold consists of the cost to purchase the product, the cost to transport the product to the point of sale, and the cost 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. CURRENCY TRANSLATION —The consolidated financial statements are presented in U.S. dollars. Our segments operate in four countries, and each segment has identified a “functional currency,” which is the primary currency in the environment in which the segment operates. The functional currencies include the U.S. dollar, the Canadian dollar, the British pound sterling, and the Mexican peso. At the end of each reporting period, the assets and liabilities of each segment are translated from its functional currency to U.S. dollars using the exchange rate at the end of the month. The monthly results of operations of each segment are generally translated from its functional currency to U.S. dollars using the average exchange rate during the month. Changes in exchange rates result in currency translation gains and losses, which are recorded within other comprehensive income (loss). Certain segments also enter into transactions in currencies other than their functional currencies. At the end of each reporting period, each segment re-measures the related receivables, payables, and cash to its functional currency using the exchange rate at the end of the period. Changes in exchange rates between the time the transactions were entered into and the end of the reporting period result in currency transaction gains or losses, which are recorded in the consolidated statements of operations. INCOME TAXES —Deferred income taxes are accounted for under the liability method, which takes into account the differences between the basis of the assets and liabilities for financial reporting purposes and amounts recognized for income tax purposes. We record valuation allowances on deferred tax assets when, in the opinion of management, it is more likely than not that the asset will not be recovered. We monitor uncertain tax positions and we recognize tax benefits only when management believes the relevant tax positions would more likely than not be sustained upon examination. We record any interest and any penalties related to income taxes within income tax expense in the consolidated statements of operations. In November 2015, the FASB issues ASU 2015-17, "Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes," which requires all deferred tax assets and liabilities to be classified as noncurrent in the statement of financial position. For public entities, this ASU is effective for annual periods beginning after December 15, 2016, and interim periods within those years. The new guidance may be applied prospectively or retrospectively and early adoption is permitted. The Company has not determined which method we will apply when we adopt the standard. The Company intends to adopt this guidance in the first quarter of 2017. The impact is not expected to be material. RECLASSIFICATIONS —Certain reclassifications have been made to conform prior year balances to the current year presentation. PENSION BENEFITS —Pension cost and obligations are actuarially determined and are affected by assumptions including expected return on plan assets, discount rates, compensation increases, and employee turnover rates. We evaluate our assumptions periodically and make adjustments to these assumptions and the recorded liability as necessary. Actuarial gains or losses are amortized on a straight-line basis over the expected remaining service life of employees in the pension plan. EQUITY-BASED COMPENSATION —We grant certain of our employees and non-managerial directors equity-based compensation awards which vest contingent on continued service of the recipient and, in some cases, on their achievement of specific performance targets or market conditions. We record compensation expense for these outstanding awards over applicable service or performance periods based on their grant date fair value with a corresponding increase to additional paid-in capital. The expense to be recorded over the life of the awards is discounted for expected forfeitures during the vesting period. NONCONTROLLING INTERESTS IN CONSOLIDATED SUBSIDIARIES —Noncontrolling interests represents third-party limited partner unitholders' interests in our consolidated subsidiary, Rose Rock. Rose Rock allocates net income to its limited partners based on the distributions pertaining to the current period's available cash as defined by Rose Rock's partnership agreement. After adjusting for the appropriate period's distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to Rose Rock's general partner, limited partners and participating securities in accordance with the contractual terms of Rose Rock's partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings. COMPREHENSIVE INCOME (LOSS) AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) —Comprehensive income (loss) 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. Our comprehensive income (loss) includes currency translation adjustments and changes in the funded status of pension benefit plans.

Rose Rock Midstream, L.P.

Rose Rock Midstream, L.P.	12 Months Ended
	Dec. 31, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Rose Rock Midstream, L.P.	ROSE ROCK MIDSTREAM, L.P. At December 31, 2015 , we owned the 2% general partner interest and a 55.1% limited partner interest made up of 20,704,418 common units of Rose Rock. We also own certain incentive distribution rights, which are described below. We control the operations of Rose Rock through our ownership of the general partner interest and consolidate Rose Rock. Rose Rock owns and operates all of our domestic crude oil assets with the exception of the Maurepas Pipeline. The outside ownership interests in Rose Rock are reflected in “noncontrolling interests in consolidated subsidiaries” on our consolidated balance sheets. The portion of the net income of Rose Rock that is attributable to outside owners is reflected within “net income attributable to noncontrolling interests” in our consolidated statements of operations and comprehensive income. Rose Rock intends to pay a minimum quarterly distribution of $0.3625 per unit to the extent it has sufficient available cash, as defined in Rose Rock’s partnership agreement. Rose Rock’s partnership agreement requires Rose Rock to distribute all of its available cash each quarter in the following manner: Total Quarterly Distributions Per Unit Target Amount Marginal Percentage Interest in Distributions Unitholders General Partner Incentive Distribution Rights Minimum Quarterly Distributions $ 0.362500 98.0 % 2.0 % — First Target Distribution above $ 0.362500 up to $ 0.416875 98.0 % 2.0 % — Second Target Distribution above $ 0.416875 up to $ 0.453125 85.0 % 2.0 % 13.0 % Third Target Distribution above $ 0.453125 up to $ 0.543750 75.0 % 2.0 % 23.0 % Thereafter above $ 0.543750 50.0 % 2.0 % 48.0 % The following table shows the distributions paid related to the earnings for each of the following periods (in thousands, except for per unit amounts): Distribution Per Unit Distributions Paid Quarter Ended SemGroup Noncontrolling Interest Common Units Total Distributions General Partner Incentive Distributions Common Units Subordinated Units December 31, 2012 $ 0.4025 $ 167 $ — $ 1,163 $ 3,377 $ 3,624 $ 8,331 March 31, 2013 $ 0.4300 $ 179 $ 41 $ 1,242 $ 3,607 $ 3,872 $ 8,941 June 30, 2013 $ 0.4400 $ 183 $ 72 $ 1,271 $ 3,692 $ 3,962 $ 9,180 September 30, 2013 $ 0.4500 $ 232 $ 127 $ 1,301 $ 3,775 $ 6,189 $ 11,624 December 31, 2013 $ 0.4650 $ 257 $ 244 $ 2,041 $ 3,901 $ 6,398 $ 12,841 March 31, 2014 $ 0.4950 $ 278 $ 488 $ 2,173 $ 4,153 $ 6,811 $ 13,903 June 30, 2014 $ 0.5350 $ 334 $ 888 $ 3,646 $ 4,488 $ 7,362 $ 16,718 September 30, 2014 $ 0.5750 $ 377 $ 1,835 $ 3,918 $ 4,824 $ 7,912 $ 18,866 December 31, 2014 $ 0.6200 $ 485 $ 3,487 $ 6,551 $ 5,202 $ 8,544 $ 24,269 March 31, 2015 $ 0.6350 $ 568 $ 4,450 $ 13,148 $ — $ 10,213 $ 28,379 June 30, 2015 $ 0.6500 $ 590 $ 4,979 $ 13,458 $ — $ 10,456 $ 29,483 September 30, 2015 $ 0.6600 $ 604 $ 5,333 $ 13,665 $ — $ 10,619 $ 30,221 December 31, 2015 $ 0.6600 (1) $ 604 $ 5,333 $ 13,665 $ — $ 10,622 $ 30,224 (1) The distribution to common unitholders related to earnings for the quarter ended December 31, 2015 was payable on February 12, 2016 to holders of record at February 2, 2016. Certain summarized balance sheet information of Rose Rock is shown below (in thousands): December 31, 2015 2014 Cash $ 9,059 $ 3,625 Other current assets 310,555 271,144 Property, plant and equipment, net 441,596 396,066 Equity method investment 438,291 269,635 Goodwill 26,628 36,116 Other noncurrent assets 31,702 29,677 Total assets $ 1,257,831 $ 1,006,263 Current liabilities $ 283,029 $ 265,682 Long-term debt 744,597 432,092 Partners’ capital attributable to SemGroup 149,376 238,560 Partners’ capital attributable to noncontrolling interests 80,829 69,929 Total liabilities and partners’ capital $ 1,257,831 $ 1,006,263 Certain summarized income statement information of Rose Rock for the years ended December 31, 2015 , 2014 , and 2013 is shown below (in thousands): Year Ended December 31, 2015 2014 2013 Revenue $ 844,711 $ 1,298,097 $ 767,202 Costs of products sold $ 671,769 $ 1,131,362 $ 663,759 Operating, general and administrative expenses $ 114,476 $ 99,894 $ 51,624 Depreciation and amortization expense $ 41,998 $ 40,035 $ 23,708 Earnings from equity method investment $ 76,355 $ 57,378 $ 17,571 Net income $ 49,673 $ 62,925 $ 37,515 Noncontrolling interest in consolidated subsidiaries retained by SemGroup $ — $ 7,758 $ 1,256 Net income attributable to Rose Rock Midstream, L.P. $ 49,673 $ 55,167 $ 36,259 Drop-down Transactions with Rose Rock 2015 drop-down transaction On February 13, 2015, we contributed WOT and Glass Mountain Holding, LLC, which holds our 50% interest in Glass Mountain, to Rose Rock 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 the general partner of Rose Rock and a related issuance of general partner interest, to allow the general partner of Rose Rock to maintain its 2% general partner interest. The cash consideration was funded through a borrowing under Rose Rock's 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 . SemGroup used the proceeds from these transactions to pay amounts owed under its revolving credit facility. As the acquisition was between parties under common control, Rose Rock recorded its interest in acquired assets and liabilities at SemGroup's historical value and SemGroup did not recognize a gain on the transaction. Proceeds in excess of the historical value were accounted for as a dividend from Rose Rock to SemGroup and resulted in a $51.5 million reduction to noncontrolling interests in consolidated subsidiaries and an offsetting increase to additional paid-in capital of $30.7 million (net of tax impact of $20.8 million ). This non-cash entry represents the portion of the proceeds in excess of historical cost which were attributed to Rose Rock's third-party unitholders. Additionally, the acquisition of WOT created a change in reporting entity which required Rose Rock's historical results to be recast as if WOT had been part of Rose Rock in prior periods. The historical summarized financial information of Rose Rock has been recast to reflect this change. The impact to prior periods was not significant. Earnings of WOT prior to the acquisition have been allocated to the general partner. The acquisition of the equity method investment in Glass Mountain did not create a change in reporting entity. As such, prior periods have not been recast to include the historical results of Glass Mountain. There was no impact to SemGroup from the Rose Rock recast as these entities are all reported within the Crude Transportation segment. 2014 drop-down transaction On June 23, 2014, we contributed the remaining 33% interest in SemCrude Pipeline, L.L.C. ("SCPL") to Rose Rock 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 the general partner and a related issuance of general partner interest, to allow the general partner to maintain its 2% general partner interest. Subsequent to this transaction, Rose Rock owns 100% of SCPL, which owns a 51% membership interest in White Cliffs. SemGroup used the proceeds from these transactions to pay amounts owed under its revolving credit facility. The Class A units were not entitled to receive any distribution 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 volumes on the White Cliffs Pipeline for such month are 125,000 barrels per day or greater. The Class A units converted to common units in January 2015. As this transaction was between parties under common control, Rose Rock recorded its interest in SCPL at SemGroup's historical value and as such no gain on the sale was recognized by SemGroup. Proceeds in excess of the historical value were accounted for as a dividend from Rose Rock to SemGroup and resulted in an $85.2 million reduction to noncontrolling interests in consolidated subsidiaries and an offsetting increase to additional paid-in capital of $53.2 million (net of tax impact of $31.9 million ). This non-cash entry represents the portion of the proceeds in excess of historical cost which were attributed to Rose Rock's third-party unitholders. SemGroup incurred approximately $0.9 million of expense associated with this transaction, including $0.4 million of costs incurred by Rose Rock. 2013 drop-down transactions On January 11, 2013, we contributed a 33% interest in SCPL to Rose Rock 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 the general partner of Rose Rock and a related issuance of general partner interest, to allow the general partner of Rose Rock to maintain its 2% general partner interest. In connection with this transaction, Rose Rock issued and sold 2.0 million common units to third-party purchasers in a private placement for aggregate consideration of approximately $59.3 million . In addition, Rose Rock made a borrowing of $133.5 million under its revolving credit facility. The proceeds from the private placement and the borrowing were used by Rose Rock to fund the cash consideration in the transaction with us and to pay certain related transaction costs and expenses. On December 16, 2013, we contributed an additional 33% interest in SCPL to Rose Rock 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 the general partner of Rose Rock and a related issuance of general partner interest, to allow the general partner of Rose Rock to maintain its 2% general partner interest. The cash consideration was funded through a borrowing under Rose Rock's credit facility. As these transactions were between parties under common control, Rose Rock recorded its interest in SCPL at SemGroup's historical value and as such no gain was recognized by SemGroup. Proceeds in excess of the historical value were accounted for as a dividend from Rose Rock to SemGroup and resulted in a $180.2 million reduction to noncontrolling interests in consolidated subsidiaries and an offsetting increase to additional paid-in capital of $112.9 million (net of tax impact of $67.3 million ). This non-cash entry represents the portion of the proceeds in excess of historical cost which were attributed to Rose Rock's third-party unitholders. SemGroup incurred approximately $2.2 million of expense associated with these transactions, including expenses of Rose Rock. Rose Rock incurred $1.6 million of equity issuance costs which were offset against proceeds, $1.6 million of costs related to the January 2013 borrowing which were deferred, and $0.9 million of acquisition related costs which were expensed. SemGroup used the proceeds from these transactions to pay amounts owed under its revolving credit facility. Rose Rock equity issuance In August 2013, Rose Rock sold 4.75 million common limited partner units to third-party purchasers for $152.5 million , net of underwriting discounts and commissions. Proceeds were used to repay borrowings on the Rose Rock credit facility. Rose Rock conversion of subordinated and Class A units On January 1, 2015, certain operational targets were achieved by White Cliffs and all 3,750,000 Class A units held by the Company were converted to common units on a one-for-one basis. The conversion did not impact the total number of Rose Rock's outstanding units representing limited partner interests. On February 17, 2015, certain targets specified in Rose Rock’s partnership agreement were achieved and all 8,389,709 subordinated units held by the Company were converted to common units. The conversion did not impact the total number of Rose Rock’s outstanding units representing limited partner interests.

Equity Method Investments

Equity Method Investments	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	EQUITY METHOD INVESTMENTS Our equity method investments consist of the following (in thousands): December 31, 2015 2014 White Cliffs $ 297,109 $ 269,635 NGL Energy 112,787 162,246 Glass Mountain 141,182 146,039 Total equity method investments $ 551,078 $ 577,920 Our earnings from equity method investments consist of the following (in thousands): Year Ended December 31, 2015 2014 2013 White Cliffs $ 70,238 $ 57,378 $ 45,459 NGL Energy (1) 5,031 2,343 7,123 Glass Mountain 6,117 4,478 (105 ) Total earnings from equity method investments $ 81,386 $ 64,199 $ 52,477 (1) Excluding gains on issuance of common units of $6.4 million , $29.0 million and $26.9 million for the years ended December 31, 2015, 2014 and 2013, respectively. Cash distributions received from equity method investments consist of the following (in thousands): Year Ended December 31, 2015 2014 2013 White Cliffs $ 86,845 $ 66,768 $ 57,576 NGL Energy 19,074 23,404 18,321 Glass Mountain 13,623 6,823 — Total cash distributions received from equity method investments $ 119,542 $ 96,995 $ 75,897 White Cliffs Certain summarized balance sheet information of White Cliffs is shown below (in thousands): December 31, 2015 2014 Current assets $ 54,091 $ 35,623 Property, plant and equipment, net 509,068 471,179 Goodwill 17,000 17,000 Other intangible assets, net 11,974 16,043 Total assets $ 592,133 $ 539,845 Current liabilities $ 9,491 $ 11,108 Members’ equity 582,642 528,737 Total liabilities and members’ equity $ 592,133 $ 539,845 Certain summarized income statement information of White Cliffs for the years ended December 31, 2015 , 2014 and 2013 is shown below (in thousands): Year Ended December 31, 2015 2014 2013 Revenue $ 206,395 $ 160,369 $ 133,310 Operating, general and administrative expenses $ 33,284 $ 23,067 $ 23,825 Depreciation and amortization expense $ 34,105 $ 23,257 $ 18,668 Net income $ 139,000 $ 114,045 $ 90,817 The equity in earnings of White Cliffs for the years ended December 31, 2015 , 2014 and 2013 reported in our consolidated statements of operations is less than 51% of the net income of White Cliffs for the same period. This is due to certain general and administrative expenses we incur 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 interests. White Cliffs recorded $1.3 million , $1.6 million and $1.8 million of such general and administrative expense for the years ended December 31, 2015 , 2014 and 2013 , respectively. The members of White Cliffs are required to contribute capital to White Cliffs to fund various projects. For the year ended December 31, 2015 , we contributed $42.8 million to these projects, including $34.5 million of contributions for an expansion project adding approximately 65,000 barrels per day of capacity. Remaining contributions related to the expansion project will be paid in 2016 and are expected to total approximately $2.3 million . The project is expected to be completed during the first half of 2016. In August 2014, White Cliffs completed an expansion project adding a parallel 12 " pipeline from Platteville, Colorado to Cushing, Oklahoma. For the years ended December 31, 2014 and 2013, we contributed $53.3 million and $95.5 million , respectively, for project funding. This expansion increased White Cliffs’ capacity to about 150,000 barrels per day and became fully operational in the third quarter of 2014. 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, 2015 and 2014 and for each of the three years in the period ended December 31, 2015 as an exhibit to this Form 10-K. NGL Energy At December 31, 2015 , we owned 4,652,568 common units representing limited partner interests in NGL Energy, which represents approximately 4.4% of the limited partner units of NGL Energy outstanding at September 30, 2015, and an 11.78% interest in the general partner of NGL Energy. On October 27, 2014, we agreed to terminate our right to appoint two representatives to the Board of Directors of NGL Energy Holdings LLC, the general partner of NGL Energy, and our current representatives resigned. We no longer have significant influence over NGL Energy Holdings, LLC or NGL Energy. However, in accordance with ASC 323-30-S99-1, we have continued to account for these investments under the equity method as our ownership is within the 3 to 5 percent interest which is generally considered to be more than minor. At December 31, 2015 , the fair market value of our 4,652,568 common unit investment in NGL Energy was $51.4 million , based on a December 31, 2015 closing price of $11.04 per common unit. This does not reflect our 11.78% interest in the general partner of NGL Energy. The fair value of our limited partner investment in NGL Energy is categorized as a Level 1 measurement, as it is based on quoted market prices. During the 4th quarter of 2015 the market price of NGL Energy common units fell below our carrying value per unit. In accordance with ASC 320-10-S99 “Investments - Debt and Equity Securities” we have assessed whether such decline in value is other than temporary. The evidence management considered in such assessment included the nature and volatility of such decline, as well as the latest public financial guidance, condition, and results of NGL Energy. Based on the rapid and recent nature of such decline, and our assessment of the financial condition and near-term prospects of NGL Energy, we have concluded that the decline in the value of our investment is not other than temporary. We have the ability and intent to hold the shares for a period of time sufficient to allow for a recovery in the market value. However, we will continue to closely monitor future events and developments related to NGL Energy that would impact our conclusions about the recoverability of the investment, and if future facts and circumstances indicate that the decline in value of our investment is other than temporary, a significant impairment may be recorded. Our policy is to record our equity in earnings of NGL Energy on a one-quarter lag, as we do not expect information on the earnings of NGL Energy to always be available in time to consistently record the earnings in the quarter in which they are generated. Accordingly, the equity in earnings from NGL Energy, which is reflected in our consolidated statements of operations and comprehensive income for the years ended December 31, 2015 , 2014 and 2013 relates to the earnings of NGL Energy for the twelve months ended September 30, 2015 , 2014 and 2013 respectively. Certain unaudited summarized balance sheet information of NGL Energy is shown below (in thousands): (Unaudited) September 30, 2015 2014 Current assets $ 1,276,919 $ 2,585,053 Property plant and equipment, net 1,845,112 1,433,313 Goodwill 1,490,928 1,170,490 Intangible and other assets, net 1,836,878 1,362,823 Total assets $ 6,449,837 $ 6,551,679 Current liabilities $ 852,170 $ 1,759,980 Long-term debt 3,093,694 2,437,351 Other noncurrent liabilities 17,679 39,518 Equity 2,486,294 2,314,830 Total liabilities and equity $ 6,449,837 $ 6,551,679 Certain unaudited summarized income statement information of NGL Energy for the twelve months ended September 30, 2015, 2014 and 2013 is shown below (in thousands): (Unaudited) Twelve Months Ended September 30, 2015 2014 2013 Revenue $ 14,504,581 $ 15,748,520 $ 5,935,715 Costs of products sold $ 13,573,066 $ 15,054,291 $ 5,478,361 Operating, general and administrative expenses $ 625,035 $ 440,609 $ 276,905 Depreciation and amortization expense $ 221,067 $ 162,443 $ 94,050 Net income $ 22,995 $ 11,409 $ 44,378 During the years ended December 31, 2015, 2014 and 2013, our limited partnership interest was diluted in connection with NGL Energy common unit issuances. Accordingly, we recorded non-cash gains of $6.4 million , $29.0 million and $26.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively, related to these transactions, which are included in "gain on issuance of common units by equity method investee" in our consolidated statements of operations and comprehensive income. During the year ended December 31, 2015, we sold 1,999,533 of our NGL Energy common units for $56.3 million , net of related costs of $0.5 million . We recorded a net gain of $14.5 million in "other expense (income), net" in our consolidated statement of operations and comprehensive income. During the year ended December 31, 2014, we sold 2,481,308 of our NGL Energy common units for $88.8 million , net of related costs of $3.1 million . We recorded a net gain of $34.2 million in "other expense (income), net" in our consolidated statement of operations and comprehensive income. Our ownership interest in NGL Energy 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 will amend this Form 10-K to include the audited financial statements of NGL Energy as of March 31, 2016 and 2015 and for each of the three years in the period ended March 31, 2016 as an exhibit, when available. Glass Mountain We hold a 50% interest in Glass Mountain which we account for under the equity method. Glass Mountain began operations in the first quarter of 2014. The excess of the recorded amount of our investment over the book value of our share of the underlying net assets represents equity method goodwill and capitalized interest of $31.0 million and $4.0 million , respectively, at December 31, 2015 . Capitalized interest is amortized as a reduction of earnings from equity method investments. The equity in earnings of Glass Mountain for the years ended December 31, 2015 and 2014 reported in our consolidated statement of operations and comprehensive income is less than 50% of the net income of Glass Mountain for the same period due to amortization of capitalized interest for the period. Certain summarized balance sheet information of Glass Mountain is shown below (in thousands): December 31, 2015 2014 Current assets $ 7,856 $ 8,810 Property, plant and equipment, net 205,920 215,876 Total assets $ 213,776 $ 224,686 Current liabilities $ 1,036 $ 2,643 Other liabilities 28 42 Members’ equity 212,712 222,001 Total liabilities and members’ equity $ 213,776 $ 224,686 Certain summarized income statement information of Glass Mountain for the year ended December 31, 2015 and 2014 is shown below (in thousands): Year Ended December 31, 2015 2014 Revenue $ 38,526 $ 30,398 Cost of Sales $ 3,392 $ 757 Operating, general and administrative expenses $ 6,643 $ 6,419 Depreciation and amortization expense $ 15,828 $ 13,872 Net income $ 12,657 $ 9,344 We invested $2.7 million , $16.2 million and $57.8 million in Glass Mountain for the years ended December 31, 2015 , 2014 and 2013 , respectively. Our ownership interest in Glass Mountain is not significant as defined by Securities and Exchange Commission's Regulation S-X Rule 1-02(w). Accordingly, no audited financial statements of Glass Mountain pursuant to Regulation S-X 3-09 have been included as an exhibit to this Form 10-K.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2015
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	ACQUISITIONS During the year ended December 31, 2014, we completed the following acquisition: Crude oil trucking assets On June 24, 2014, our Crude Transportation segment acquired crude oil trucking assets from a subsidiary of Chesapeake Energy Corporation ("Chesapeake") (NYSE: CHK) 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. During the year ended December 31, 2013, we completed the following acquisitions: Mid-America Midstream Gas Services, L.L.C. On August 1, 2013, our SemGas segment acquired the equity interest of Mid-America Midstream Gas Services, L.L.C. ("MMGS"), a wholly owned subsidiary of Chesapeake, which is the owner of gas gathering and processing assets in the Mississippi Lime play for approximately $314.0 million in cash. We incurred approximately $3.6 million in transaction related general and administrative expenses. The transaction was funded through the combination of a portion of the net proceeds from the sale of $300 million of 7.50% senior unsecured notes (Note 15) and a borrowing under the revolving credit facility under SemGroup's corporate credit agreement. Highlights of the acquisition include the following: • 200 miles of gathering pipeline; • Rose Valley I plant - A 200 mmcf/d (million cubic feet per day) cryogenic processing plant, placed in operation in the first quarter of 2014; • Rose Valley II plant - A 200 mmcf/d cryogenic processing plant placed in operation in mid-2015; • Approximately 540,000 net acre dedication in the core of the Mississippi Lime play, supported by a joint venture between Chesapeake and Sinopec International Petroleum Exploration and Production Corporation ("Sinopec"); and • A 20 -year, 100% fee based, gas gathering and processing agreement with certain affiliates of Chesapeake and Sinopec. Barcas Field Services, LLC On September 1, 2013, our Crude Transportation segment 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, which has expired. NGL Energy On August 6, 2013, we completed the acquisition of approximately 5.36% of the general partner of NGL Energy, which increased our ownership of NGL Energy's general partner to 11.78% .

Disposals of Long-Lived Assets

Disposals of Long-Lived Assets	12 Months Ended
	Dec. 31, 2015
Disposals And Impairments Of Long-Lived Assets [Abstract]
Disposals of Long-Lived Assets	DISPOSALS OR IMPAIRMENTS OF LONG-LIVED ASSETS Year Ended December 31, 2015 During the year ended December 31, 2015, our SemGas segment sold certain non-core Kansas based gas gathering and compression assets for approximately $1.0 million , resulting in a pre-tax loss of approximately $1.7 million which is reported in "loss (gain) on disposal or impairment, net" in the consolidated statement of operations and comprehensive income. See Note 12 for discussion of the goodwill impairment recorded by our Crude Transportation segment. Year Ended December 31, 2014 On June 1, 2014, our SemGas segment sold certain natural gas gathering assets in Eastern Oklahoma resulting in a $20.1 million pre-tax loss on a cash sales price of $2.4 million . The assets sold were made up of property, plant and equipment with a net book value of $22.5 million . The loss on the sale was reported in "loss (gain) on disposal or impairment, net" in the consolidated statement of operations and comprehensive income. The operations of the gas gathering assets were not material to SemGroup. During the year ended December 31, 2014, we recorded an impairment charge of $11.9 million related to leaseholds of unproved oil and gas properties located in Kansas. These assets were written off when due to the downturn in crude oil prices and the remaining life of the leaseholds, it became apparent that these properties would not be developed. These assets were held by a subsidiary included in Corporate and Other in our segment disclosures (Note 8). Year Ended December 31, 2013 There were no significant gains (losses) recorded during the year ended December 31, 2013 related to the disposal or impairment of long-lived assets.

Segments

Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segments	SEGMENTS As described in Note 1, our businesses are organized based on the nature and location of the services they provide. Certain summarized information related to our reportable segments is shown in the tables below. None of the operating segments have been aggregated. Our equity investment in NGL Energy is included within the SemStream segment. Although Corporate and Other does not represent an operating segment, it is included in the tables below to reconcile segment information to that of the consolidated Company. Eliminations of transactions between segments are also included within Corporate and Other in the tables below. During the year ended December 31, 2015, management made the decision to disaggregate certain activities and functions within the domestic crude oil business to provide additional granularity, both internally and externally, to our operating results. As such, the prior period results of the former Crude segment have been recast to reflect the resulting reportable segments: Crude Transportation, Crude Facilities and Crude Supply and Logistics. Certain amounts formerly included in the Crude segment have been included in Corporate and Other in the current presentation. No other segments were impacted. The accounting policies of each segment are the same as the accounting policies of the consolidated Company. Transactions between segments are generally recorded based on prices negotiated between the segments. Certain general and administrative and interest expenses incurred at the corporate level were allocated to the segments, based on our allocation policies in effect at the time. Year Ended December 31, 2015 2014 2013 Revenues: Crude Transportation External $ 81,991 $ 84,718 $ 34,917 Intersegment 15,021 10,840 225 Crude Facilities External 45,936 44,007 46,697 Crude Supply and Logistics External 716,784 1,169,372 685,588 SemGas External 231,569 342,286 207,134 Intersegment 20,605 37,897 23,985 SemCAMS External 136,197 176,724 198,450 SemLogistics External 24,351 12,650 11,671 SemMexico External 211,291 290,869 242,559 Corporate and Other External 6,975 1,953 — Intersegment (35,626 ) (48,737 ) (24,210 ) Total Revenues $ 1,455,094 $ 2,122,579 $ 1,427,016 Year Ended December 31, 2015 2014 2013 Earnings from equity method investments: Crude Transportation $ 76,355 $ 61,856 $ 45,354 SemStream (1) 11,416 31,363 33,996 Total earnings from equity method investments $ 87,771 $ 93,219 $ 79,350 (1) including gain on issuance of common units by equity method investee Year Ended December 31, 2015 2014 2013 Depreciation and amortization: Crude Transportation $ 35,500 $ 33,679 $ 17,814 Crude Facilities 5,829 5,365 4,833 Crude Supply and Logistics 159 549 673 SemGas 31,803 26,353 14,517 SemCAMS 12,940 14,295 10,766 SemLogistics 8,543 10,005 9,426 SemMexico 4,076 6,031 5,991 Corporate and Other 2,032 2,120 2,389 Total depreciation and amortization $ 100,882 $ 98,397 $ 66,409 Year Ended December 31, 2015 2014 2013 Income tax expense (benefit): SemCAMS $ 4,847 $ 3,135 $ 6,348 SemLogistics (2,195 ) (2,231 ) (5,699 ) SemMexico 2,611 4,053 2,589 Corporate and other 28,267 41,556 (20,492 ) Total income tax expense (benefit) $ 33,530 $ 46,513 $ (17,254 ) Year Ended December 31, 2015 2014 2013 Segment profit (1) : Crude Transportation $ 81,028 $ 76,705 $ 51,100 Crude Facilities 33,757 32,286 37,083 Crude Supply and Logistics 30,088 24,021 15,010 SemGas 61,669 41,715 32,483 SemCAMS 36,013 45,326 32,886 SemStream 11,391 31,280 33,389 SemLogistics 7,249 25 (2,007 ) SemMexico 15,614 16,139 13,493 Corporate and Other (44,760 ) (43,841 ) (30,088 ) Total segment profit $ 232,049 $ 223,656 $ 183,349 (1) Segment profit represents revenues excluding unrealized gains (losses) related to derivative instruments plus earnings from equity method investments less cost of sales excluding depreciation and amortization and less operating and general and administrative expenses. Year Ended December 31, 2015 2014 2013 Reconciliation of segment profit to net income: Total segment profit $ 232,049 $ 223,656 $ 183,349 Less: Net unrealized loss (gain) related to derivative instruments 2,014 (1,734 ) (974 ) Depreciation and amortization 100,882 98,397 66,409 Interest expense 69,675 49,044 25,142 Foreign currency transaction gain (1,067 ) (86 ) (1,633 ) Other expense (income), net (15,801 ) (20,536 ) 45,906 Income tax expense (benefit) 33,530 46,513 (17,254 ) Loss (income) from discontinued operations 4 1 (59 ) Net income $ 42,812 $ 52,057 $ 65,812 Year Ended December 31, 2015 2014 2013 Additions to long-lived assets, including acquisitions and contributions to equity method investments: Crude Transportation $ 219,227 $ 160,471 $ 244,777 Crude Facilities 30,118 8,207 11,783 Crude Supply and Logistics 2,564 11,662 1,868 SemGas 110,908 153,088 410,508 SemCAMS 142,368 35,286 56,122 SemLogistics 12,289 2,974 2,071 SemMexico 7,051 9,690 6,375 SemStream — — 18,775 Corporate and Other 1,919 1,906 1,211 Total additions to long-lived assets $ 526,444 $ 383,284 $ 753,490 December 31, 2015 2014 Total assets (excluding intersegment receivables): Crude Transportation $ 877,017 $ 746,723 Crude Facilities 155,186 116,784 Crude Supply and Logistics 328,419 271,444 SemGas 719,789 662,223 SemCAMS 331,749 279,191 SemLogistics 155,794 150,498 SemMexico 89,608 107,225 SemStream 112,787 162,246 Corporate and Other 100,947 93,468 Total $ 2,871,296 $ 2,589,802 December 31, 2015 2014 Equity investments: Crude Transportation $ 438,291 $ 415,674 SemStream 112,787 162,246 Total equity investments $ 551,078 $ 577,920

Inventories

Inventories	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following (in thousands): December 31, 2015 2014 Crude oil $ 59,121 $ 26,722 Asphalt and other 11,118 16,810 Total inventories $ 70,239 $ 43,532 During the years ended December 31, 2015 and 2014, our Crude Supply and Logistics segment recorded non-cash charges of $2.6 million and $5.7 million to write-down crude oil inventory to the lower of cost or market.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2015
Other Assets [Abstract]
Other Assets	OTHER ASSETS Other current assets consist of the following (in thousands): December 31, 2015 2014 Prepaid expenses $ 6,252 $ 5,989 Deferred tax asset 2,321 5,897 Other 10,814 8,131 Total other current assets $ 19,387 $ 20,017 Other noncurrent assets consist of the following (in thousands): December 31, 2015 2014 Debt issuance costs, net (1) $ 23,728 $ 22,203 Deferred tax asset 34,848 13,933 Other 3,579 8,250 Total other noncurrent assets, net $ 62,155 $ 44,386 (1) See Note 15 for discussion of debt issuance costs.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consists of the following (in thousands): December 31, 2015 2014 Land $ 89,815 $ 81,886 Pipelines and related facilities 338,789 283,347 Storage and terminal facilities 283,608 284,300 Natural gas gathering and processing facilities 810,358 606,553 Linefill 26,900 26,050 Trucking equipment and other 43,157 40,392 Office property and equipment 45,818 37,120 Construction-in-progress 248,145 142,806 Property, plant and equipment, gross 1,886,590 1,502,454 Accumulated depreciation (319,769 ) (245,629 ) Property, plant and equipment, net $ 1,566,821 $ 1,256,825 We recorded depreciation expense of $90.5 million , $82.5 million and $60.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. We include within the cost of property, plant and equipment interest costs incurred while an asset is being constructed. We capitalized $1.0 million , $1.5 million and $4.3 million of interest costs during the years ended December 31, 2015 , 2014 and 2013 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill And Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill Goodwill relates to the following segments (in thousands): December 31, 2015 2014 Crude Transportation $ 26,628 $ 36,116 SemGas 13,052 13,052 SemMexico 8,352 9,158 Total Goodwill $ 48,032 $ 58,326 In addition to the amounts in the table above, approximately $46.4 million of our investment in NGL Energy and $31.0 million of our investment in Glass Mountain represents equity method goodwill. Equity method goodwill is not amortized and is tested for impairment with the equity method investment in accordance with ASC 323. We assess our goodwill for impairment at least annually as of October 1. No impairments were indicated as of October 1, 2015. However, as a result of the continued decline in oil prices and lower forecast volumes from declining drilling activity, along with lower than expected results during the fourth quarter of 2015, we performed an interim goodwill impairment analysis as of December 31, 2015 which resulted in an impairment charge of $9.5 million related to our crude oil trucking operation which was identified as the reporting unit for purposes of the impairment test. We used an income approach, supplemented by a market approach to calculate the fair value of the reporting unit. Under the income approach, we utilized a discounted cash flow model to determine the fair value of our crude oil trucking operations. Significant judgments and assumptions included the discount rate, anticipated revenue and volume growth rates, estimated operating expenses and capital expenditures, which were based on our operating and capital budgets as well as our strategic plans. A significant underlying assumption is that crude oil prices will eventually improve and production volumes will begin to increase. If crude oil production does not increase in the future or the production takes longer than anticipated to return, this would negatively affect our key assumptions and potentially lead to additional impairments in the future. We considered the market approach by comparing the revenue and earnings multiples implied by our income approach to those of comparable companies for reasonableness. Changes in goodwill balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands): Balance, December 31, 2012 $ 9,884 Barcas acquisition (Note 6) 28,322 MMGS acquisition (Note 6) 23,839 Currency translation adjustments (24 ) Balance, December 31, 2013 62,021 Crude oil trucking asset acquisition (Note 6) 7,892 MMGS purchase price allocation adjustment (10,787 ) Barcas purchase price allocation adjustment (98 ) Currency translation adjustments (702 ) Balance, December 31, 2014 58,326 Impairment loss (9,488 ) Currency translation adjustments (806 ) Balance, December 31, 2015 $ 48,032 For U.S. federal income tax purposes, goodwill is amortized on a straight-line basis over 15 years . Other intangible assets The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands): December 31, 2015 December 31, 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Customer Relationships $ 188,304 $ (26,975 ) $ 161,329 $ 189,583 $ (17,963 ) $ 171,620 Trade Names 493 (378 ) 115 570 (379 ) 191 Unpatented Technology 2,941 (2,162 ) 779 3,457 (2,203 ) 1,254 Total other intangible assets $ 191,738 $ (29,515 ) $ 162,223 $ 193,610 $ (20,545 ) $ 173,065 Changes in other intangible asset balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands): Balance, December 31, 2012 $ 7,585 Amortization (6,018 ) Barcas acquisition 6,930 MMGS acquisition 166,332 Currency translation adjustments 9 Balance, December 31, 2013 174,838 Amortization (15,875 ) Crude oil trucking asset acquisition 17,010 MMGS purchase price allocation adjustment (2,313 ) Barcas purchase price allocation adjustment (50 ) Currency translation adjustments (545 ) Balance, December 31, 2014 173,065 Amortization (10,334 ) Currency translation adjustments (508 ) Balance, December 31, 2015 $ 162,223 Our other intangible assets consist primarily of customer relationships at our Crude Transportation, SemGas and SemMexico segments. These assets may be subject to impairments in the future if we are unable to maintain the relationships with the customers to which the assets relate. We estimate that future amortization of other intangible assets will be as follows (in thousands): For year ending: December 31, 2016 $ 10,928 December 31, 2017 11,011 December 31, 2018 10,918 December 31, 2019 10,316 December 31, 2020 9,649 Thereafter 109,401 Total estimated amortization expense $ 162,223

Financial Instruments and Conce

Financial Instruments and Concentrations of Risk	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Financial Instruments and Concentrations of Risk	FINANCIAL INSTRUMENTS AND CONCENTRATIONS OF RISK Fair value of financial instruments We record certain financial assets and liabilities at fair value at each balance sheet date. The table below summarizes the balances of commodity derivative assets and liabilities at December 31, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 Derivatives subject to netting arrangements: Level 1 Netting (1) Total Level 1 Netting (1) Total Commodity derivatives: Assets $ 131 $ (131 ) $ — $ 3,311 $ (1,637 ) $ 1,674 Liabilities $ 470 $ (131 ) $ 339 $ 1,637 $ (1,637 ) $ — (1) 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. The valuation of our common stock warrants which were traded on the New York Stock Exchange was also classified as Level 1. “Level 2” measurements are based on inputs consisting of market observable and corroborated prices for similar commodity derivative contracts. Assets and liabilities classified as Level 2 include over-the-counter ("OTC") traded forwards contracts and swaps. “Level 3” measurements are obtained using information from a pricing service and internal valuation models incorporating observable and unobservable market data. These include commodity derivatives, such as forwards and swaps for which there is not a highly liquid market, and therefore are not included in Level 2 above. Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the measurement requires judgment, and may affect the valuation of assets and liabilities and their placement within the fair value levels. There were no financial assets or liabilities classified as Level 2 or Level 3 during the years ended December 31, 2015 , 2014 and 2013 , as such no rollforward of Level 3 activity has been presented. Commodity derivative contracts Our consolidated 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 petroleum products to create back-to-back transactions that are intended to lock in positive margins based on the timing, location or quality of the petroleum products purchased and delivered or (ii) derivative contracts. Our storage and transportation assets can also 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 swaps, futures contracts and forward contracts of crude oil and natural gas liquids. These are defined as follows: Swaps – OTC transactions where a floating price, basis or index is exchanged for a fixed (or a different floating) price, basis or index at a preset schedule in the future, according to an agreed-upon formula. 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. Forward contracts – 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. The following table sets forth the notional quantities for derivative instruments entered into (in thousands of barrels): Year Ended December 31, 2015 2014 2013 Sales 23,228 6,773 2,595 Purchases 22,946 6,477 2,575 We have not designated any of our commodity derivative instruments as accounting hedges. We have recorded the fair value of our commodity derivative instruments on our consolidated balance sheets in "other current assets" and "other current liabilities" in the following amounts (in thousands): December 31, 2015 December 31, 2014 Other Current Assets Other Current Liabilities Other Current Assets Other Current Liabilities $ — $ 339 $ 1,674 $ — 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 $2.9 million and $0.8 million at December 31, 2015 and 2014 , 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, 2015 and 2014 , we would have had net asset positions of $2.6 million and $2.5 million , respectively. Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands): Year Ended December 31, 2015 2014 2013 Realized and unrealized gain (loss) $ 8,146 $ 19,305 $ (1,593 ) Warrants In addition to the commodity derivatives above, we had $58.1 million of derivative liabilities related to common stock warrants at December 31, 2013, which were not subject to netting arrangements. The warrants were issued upon emergence from bankruptcy and were recorded at fair value on the consolidated balance sheets with changes in the fair value recorded to "other expense (income), net" in our consolidated statements of operations and comprehensive income. For the years ended December 31, 2014, and 2013 , we recorded expense related to the change in fair value of $13.4 million and $46.4 million , respectively. The warrants expired on November 30, 2014. See Note 17 for additional information. Concentrations of risk During the year ended December 31, 2015 , two customers primarily of our Crude Supply and Logistics segment accounted for more than 10% of our consolidated revenue with revenues of $457.3 million and $146.2 million . We purchased approximately $232.6 million of product from two third-party suppliers of our Crude Supply and Logistics segment, which represented approximately 24% of our costs of products sold. At December 31, 2015 , one customer, primarily of our Crude Supply and Logistics segment, accounted for approximately 39% of our consolidated accounts receivable. Our SemGas segment has a significant concentration of producers which account for a large portion of our SemGas segment's volumes. During the year ended December 31, 2015, three producers accounted for approximately 92% of our total processed volumes. During the year ended December 31, 2015, three producers accounted for 93% of our total gathered volumes. Additionally, all of the processing and gathering volumes from these customers are produced in the Northern Oklahoma region. Our SemCAMS processing plants require a minimum rate of sulfur tonnage to operate, and to comply with the regulatory requirements for air emissions. We have several large producers that provide significant sour gas to our plants. If these producers shut in their sour gas production due to current commodity prices, it could result in regulatory non-compliance, as well as operating and financial impacts to SemCAMS. Assets and liabilities of subsidiaries outside the United States The following table summarizes the assets and liabilities (excluding affiliate balances) at December 31, 2015 of our subsidiaries outside the United States (in thousands): Canada United Kingdom Mexico Total Cash and cash equivalents $ 20,729 $ 8,014 $ 17,338 $ 46,081 Other current assets 47,267 3,413 31,616 82,296 Noncurrent assets 273,967 144,367 40,654 458,988 Total assets $ 341,963 $ 155,794 $ 89,608 $ 587,365 Current liabilities $ 40,541 $ 5,660 $ 15,868 $ 62,069 Noncurrent liabilities 47,971 15,633 1,167 64,771 Total liabilities 88,512 21,293 17,035 126,840 Net assets $ 253,451 $ 134,501 $ 72,573 $ 460,525 Employees At December 31, 2015 , we had approximately 1,160 employees, including approximately 555 employees outside the U.S. Approximately 130 of the employees in Canada and Mexico are represented by labor unions and are subject to collective bargaining agreements governing their employment with us. Of that number, approximately 68 employees have collective bargaining agreements that renew annually and 60 have collective bargaining agreements that expired in January 2016 and are currently being renegotiated. We have never had a labor related work stoppage and believe our employee relations are good.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income tax expense (benefit) Our consolidated income from continuing operations before income taxes was generated in the following jurisdictions (in thousands): Year Ended December 31, 2015 2014 2013 U.S. $ 46,728 $ 39,231 $ 40,002 Foreign 29,618 59,340 8,497 Consolidated $ 76,346 $ 98,571 $ 48,499 The following table summarizes income tax provision (benefit) from continuing operations by jurisdiction (in thousands): Year Ended December 31, 2015 2014 2013 Current income tax provision: Foreign $ 4,301 $ 10,430 $ 15,546 U.S. federal — (195 ) 2,067 U.S. state 32 132 1,435 4,333 10,367 19,048 Deferred income tax provision (benefit): Foreign 4,747 2,024 (10,222 ) U.S. federal 21,865 30,074 (23,756 ) U.S. state 2,585 4,048 (2,324 ) 29,197 36,146 (36,302 ) Provision (benefit) for income taxes $ 33,530 $ 46,513 $ (17,254 ) The following table reconciles income tax provision at the U.S. federal statutory rate to the consolidated provision (benefit) for income taxes (in thousands): Year Ended December 31, 2015 2014 2013 Income from continuing operations before income taxes $ 76,346 $ 98,571 $ 48,499 U.S. federal statutory rate 35 % 35 % 35 % Provision at statutory rate 26,721 34,500 16,975 State income taxes—net of federal benefit 1,701 3,197 (577 ) Effect of rates other than statutory (2,306 ) (1,925 ) (1,041 ) Effect of U.S. taxation on foreign branches 10,366 20,769 2,974 Foreign tax adjustment, prior years 7 (3,669 ) 4,533 Warrants — 4,698 24,625 Noncontrolling interest (4,373 ) (7,986 ) (6,096 ) Foreign tax credit and offset to branch deferreds (1,740 ) 6,851 (2,876 ) Impact of valuation allowance on deferred tax assets 1,740 (7,331 ) (53,218 ) Foreign net gain on subsidiary dissolution and debt waivers — (13,620 ) — Foreign withholding taxes 6 5,054 — Other, net 1,408 5,975 (2,553 ) Provision (benefit) for income taxes $ 33,530 $ 46,513 $ (17,254 ) For the years ended December 31, 2015 , 2014 and 2013 , the foreign subsidiaries are disregarded entities for U.S. federal income tax purposes. The foreign earnings are taxed in foreign jurisdictions as well as in the U.S. Foreign tax credits, subject to limitations, are available to reduce U.S. taxes. Deferred tax positions Deferred income taxes reflect the effects of temporary differences between the amounts of assets and liabilities recognized for financial reporting purposes and the amounts recognized for income tax purposes. Significant components of deferred tax assets and liabilities are as follows at December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Deferred tax assets: Net operating loss and other credit carryforwards $ 55,100 $ 38,835 Compensation and benefits 8,178 10,736 Inventories 213 280 Intangible assets 35,152 43,977 Pension plan 4,643 3,733 Allowance for doubtful accounts 1,552 1,860 Deferred revenue 4,619 7,622 Foreign tax credit and offset to branch deferreds 104,026 102,286 Other 41,318 17,786 less: valuation allowance (104,509 ) (102,769 ) Net deferred tax assets 150,292 124,346 Deferred tax liabilities: Intangible assets (4,638 ) (5,770 ) Prepaid expenses (142 ) (163 ) Property, plant and equipment (219,247 ) (178,505 ) Equity investment in partnerships (85,385 ) (78,813 ) Other (4,107 ) (2,549 ) Total deferred tax liabilities (313,519 ) (265,800 ) Net deferred tax liabilities $ (163,227 ) $ (141,454 ) At December 31, 2015 , we had a cumulative U.S. federal net operating loss of approximately $127.9 million that can be carried forward to apply against taxable income generated in future years. This carry forward begins to expire in 2031. We had cumulative U.S. state net operating losses of approximately $90.4 million available for carryforward, which begin to expire in 2016. We had a foreign net operating loss of $23.6 million available for indefinite carryforward. We had foreign tax credits of approximately $59.3 million available for carry forward, which begin to expire in 2020. Due to our emergence from bankruptcy and overall restructuring, we recorded a full valuation allowance on all U.S. federal and state deferred tax assets in all periods prior to March 31, 2013. Deferred tax assets are reduced by a valuation allowance when a determination is made that it is more likely than not that some, or all, of the deferred tax assets will not be realized based on the weight of all available evidence. Evidence which is objectively verifiable carries a higher weight in the analysis. The ultimate realization of deferred tax assets is dependent upon the existence of sufficient taxable income of the appropriate character within the carryback and carryforward period available under the tax law. Sources of taxable income include future reversals of existing taxable temporary differences, future earnings and available tax planning strategies. In 2013, we recorded a discrete tax benefit for the partial release of our valuation allowance. Gain recognition, for tax purposes, on the contribution of a one-third interest in SCPL to Rose Rock had a material impact to the available positive and objectively verifiable evidence and combined with other factors, resulted in the change in our assessment of recoverability of the deferred tax assets. We did not release the valuation allowance attributable to a small portion of our state net operating loss carryovers which have shorter carryover periods. We have not released the valuation allowance on the foreign tax credits due to the foreign tax credit limitation and the relative subjectivity of forecasts of the relational magnitude of U.S. and foreign taxable income in future periods, as well as the shorter carryover period available for the credits. The valuation allowance increased by $1.7 million during 2015. The change related to a net increase of $1.7 million for foreign tax credits and offset to branch deferreds. We have analyzed filing positions in all of the federal, state and foreign jurisdictions where we are required to file income tax returns and determined that no accruals related to uncertainty in tax positions are required. All income tax years of the Company ending after the emergence from bankruptcy remain open for examination in U.S. jurisdictions under general operation of the statute of limitations, including special provisions with regard to net operating loss carryovers. In foreign jurisdictions, all tax periods prior to the emergence from bankruptcy are closed. The statute of limitations has not been waived with respect to any foreign jurisdictions post emergence and tax periods are open for examination in accordance with the general statutes of each foreign jurisdiction. Currently, there are no examinations in progress for our federal, state or foreign jurisdictions.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	LONG-TERM DEBT Our long-term debt consisted of the following (in thousands): December 31, 2015 2014 SemGroup 7.50% senior unsecured notes due 2021 $ 300,000 $ 300,000 SemGroup corporate revolving credit facility 30,000 35,000 Rose Rock 5.625% senior unsecured notes due 2022 400,000 400,000 Rose Rock 5.625% senior unsecured notes due 2023, net of discount 344,545 — Rose Rock credit facility — 32,000 SemMexico credit facility — — Capital leases 83 132 Total long-term debt 1,074,628 767,132 less: current portion of long-term debt 31 40 Noncurrent portion of long-term debt $ 1,074,597 $ 767,092 SemGroup senior unsecured notes due 2021 At December 31, 2015, we had outstanding $300 million of 7.50% senior unsecured notes due 2021 (the “SemGroup Notes”). The SemGroup Notes are guaranteed by certain of our subsidiaries: SemGas, L.P., SemMaterials, L.P., SemGroup Europe Holding, L.L.C., SemOperating G.P., L.L.C., SemMexico, L.L.C., SemDevelopment, L.L.C., Rose Rock Midstream Holdings, LLC and Mid-America Midstream Gas Services, L.L.C. (collectively, the "Guarantors"). The guarantees of the SemGroup Notes are full and unconditional and constitute the joint and several obligations of the Guarantors. The SemGroup Notes are governed by an indenture, as supplemented, between the Company and its subsidiary Guarantors and Wilmington Trust, N.A., 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; enter into sale and lease-back transactions; 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, including events of default relating to non-payment of principal and other amounts owing from time to time, failure to provide required reports, failure to comply with agreements in the indenture, cross payment-defaults to any material indebtedness, bankruptcy and insolvency events, certain unsatisfied judgments, and invalidation or cessation of the subsidiary guarantee of a significant subsidiary. A default would permit holders to declare the SemGroup Notes and accrued interest due and payable. The SemGroup Notes are effectively subordinated in right of payment to any of our, and the Guarantors', existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness and are structurally subordinated to the obligations of any subsidiary that is not a guarantor of the SemGroup Notes. The Company may issue additional SemGroup Notes under the Indenture from time to time, subject to the terms of the Indenture. Except as described below, the SemGroup Notes are not redeemable at the Company's option prior to June 15, 2016. From and after June 15, 2016, the Company may redeem the SemGroup 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 June 15 of each of the years indicated below: SemGroup 2021 senior unsecured notes 2016 105.625% 2017 103.750% 2018 101.875% 2019 and thereafter 100.000% Prior to June 15, 2016, the Company may, at its option, on one or more occasions, redeem up to 35% of the sum of the original aggregate principal amount of the SemGroup Notes at a redemption price equal to 107.5% of the aggregate principal amount thereof, plus accrued and unpaid interest, with the net cash proceeds of one or more equity offerings of the Company, subject to certain conditions. Prior to June 15, 2016, the Company may also redeem all or part of the SemGroup 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 June 15, 2016 redemption price from the table above plus all required interest payments due through June 15, 2016, 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 Company is required to offer to repurchase the SemGroup Notes at an amount equal to 101% of the principal plus accrued and unpaid interest. Interest on the SemGroup Notes is payable in arrears on June 15th and December 15th to holders of record on June 1st and December 1st each year until maturity. For the years ended December 31, 2015 , 2014 and 2013 , we incurred $23.3 million , $23.3 million and $12.7 million , respectively, of interest expense related to the SemGroup Notes including the amortization of debt issuance costs. At December 31, 2015 , we had $4.5 million of unamortized debt issuance costs related to the SemGroup Notes included in other noncurrent assets on our consolidated balance sheet. At December 31, 2015 , we were in compliance with the terms of the SemGroup Notes. SemGroup corporate credit agreement Our revolving credit facility has a capacity of $500 million at December 31, 2015 . This capacity may be used either for cash borrowings or letters of credit, although the maximum letter of credit capacity is $250 million . The credit agreement allows for the increase of the revolving commitments under the credit agreement by an aggregate amount of $300 million subject to the satisfaction of certain conditions. The agreement matures on December 11, 2018. Earlier principal payments may be required if we enter into certain transactions to sell assets or obtain new borrowings. We have the right to make additional principal payments without incurring any penalties for early repayment. Interest on revolving credit cash borrowings is charged at either a Eurodollar rate or an alternate base rate ("ABR"), at our election, plus, in each case an applicable margin. The applicable margin will range from 2.0% to 3.25% in the case of a Eurodollar loan, and from 1.0% to 2.25% in the case of an ABR loan, in each case, based on a leverage ratio specified in the agreement. At December 31, 2015 , there were $30.0 million of outstanding borrowings which incurred interest at the ABR. The interest rate in effect at December 31, 2015 on alternate base rate borrowings was 4.50% . Fees are charged on any outstanding letters of credit at a rate that ranges from 2.0% to 3.25% , depending on a leverage ratio specified in the credit agreement. At December 31, 2015 , we had $4.7 million of outstanding letters of credit for which the rate in effect was 2.0% . In addition, a fronting fee of 0.25% is charged on outstanding letters of credit. A commitment fee that ranges from 0.375% to 0.5% , depending on a leverage ratio defined in the credit agreement, is charged on any unused capacity on the revolving credit facility. In addition, we are charged an annual administrative fee of $0.1 million . At December 31, 2015 , we had unamortized capitalized loan fees of $4.2 million net of accumulated amortization, which was recorded in other noncurrent assets and is being amortized over the life of the agreement. We recorded interest expense related to the revolving credit facility of $3.8 million , $6.3 million and $7.7 million for the years ended December 31, 2015 , 2014 and 2013 , respectively, including amortization of capitalized loan fees. The credit agreement includes customary affirmative and negative covenants, including limitations on the creation of new indebtedness, liens, sale and lease-back transactions, new investments, making fundamental changes including mergers and consolidations, making of dividends and other distributions, making material changes in our business, modifying certain documents and maintenance of a consolidated leverage ratio and an interest coverage ratio. In addition, the credit agreement prohibits any commodity transactions that are not permitted by our comprehensive risk management policy. The terms of our current credit facility restrict, to some extent, the payment of cash dividends on our common stock. The credit agreement is guaranteed by all of our material domestic subsidiaries (except for Rose Rock and its general partner and subsidiaries) and secured by a lien on substantially all of our property and assets, subject to customary exceptions. At December 31, 2015 , we were in compliance with the terms of the credit agreement. Rose Rock senior unsecured notes due 2022 and 2023 At December 31, 2015 , Rose Rock had outstanding $400 million of 5.625% senior unsecured notes due 2022 (the “Rose Rock 2022 Notes”) and $350 million of 5.625% senior unsecured notes due 2023 (the "Rose Rock 2023 Notes") (collectively, the "Rose Rock Notes"). Rose Rock and its wholly-owned subsidiary, Rose Rock Finance Corporation ("Finance Corp."), are co-issuers of the Rose Rock Notes. The Rose Rock 2023 Notes were sold at 98.345% of par, a discount of $5.8 million , on May 14, 2015. The discount is reported as a reduction to the face value of the Rose Rock 2023 Notes on our consolidated balance sheets and is being amortized over the life of the Rose Rock 2023 Notes using the interest method. At December 31, 2015 , the unamortized discount was $5.5 million . The net proceeds from the offering of the Rose Rock 2023 Notes of $337.7 million , after the discount and $6.5 million of underwriters' fees and offering expenses, were used to repay amounts borrowed under Rose Rock's revolving credit facility and for general partnership purposes. Interest on the Rose Rock 2022 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 years ended December 31, 2015 and 2014, we recorded interest expense of $23.5 million and $11.7 million , respectively, including amortization of debt issuance costs on the Rose Rock 2022 Notes. Interest on the Rose Rock 2023 Notes is payable in arrears on May 15th and November 15th to holders of record on May 1st and November 1st each year until maturity. For the year ended December 31, 2015 , we recorded interest expense of $13.2 million , including amortization of debt issuance costs and amortization of discount on the Rose Rock 2023 Notes. At December 31, 2015 , we had $12.2 million of debt issuance costs, net of accumulated amortization, related to the Rose Rock Notes included in other noncurrent assets on our consolidated balance sheet. The Rose Rock Notes are governed by indentures between Rose Rock, its subsidiary guarantors, Finance Corp. and Wilmington Trust, National Association, as trustee (the “Rose Rock Indenture”). The Rose Rock Indentures include customary covenants, including limitations on Rose Rock's 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 its assets; and designate its subsidiaries as unrestricted under the Rose Rock Indentures. The Rose Rock Indentures include customary events of default. A default would permit the trustee or holders of at least 25% in aggregate principal amounts of the Rose Rock Notes then outstanding to declare all amounts owing under the Rose Rock Notes to be due and payable. The Rose Rock Notes are effectively subordinated in right of payment to any of Rose Rock's, and the subsidiary guarantors', existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness. Rose Rock may issue additional Rose Rock Notes under the Rose Rock Indentures from time to time, subject to the terms of the Rose Rock Indentures. Except as described below, the Rose Rock 2022 and 2023 Notes are not redeemable at Rose Rock's option prior to July 15, 2017 and May 15, 2019, respectively. From and after July 15, 2017, in the case of the Rose Rock 2022 Notes, or May 15, 2019, in the case of the Rose Rock 2023 Notes, Rose Rock may redeem the Rose Rock 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 for the Rose Rock 2022 Notes or May 15 for the Rose Rock 2023 Notes of each of the years indicated below for the respective Notes: Rose Rock 2022 senior unsecured notes 2017 104.219% 2018 102.813% 2019 101.406% 2020 and thereafter 100.000% Rose Rock 2023 senior unsecured notes 2019 102.813% 2020 101.406% 2021 and thereafter 100.000% Prior to July 15, 2017, in the case of the Rose Rock 2022 Notes, or May 15, 2018, in the case of the Rose Rock 2023 Notes, Rose Rock may, at its option, on one or more occasions, redeem up to 35% of the sum of the original aggregate principal amount of the Rose Rock 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 Rose Rock, or the parent of Rose Rock to the extent such net proceeds are contributed to Rose Rock, subject to certain conditions. Prior to July 15, 2017, in the case of the 2022 Notes, or May 15, 2019, in the case of the 2023 Notes, Rose Rock may also redeem all or part of the Rose Rock 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 redemption price from the table above plus all required interest payments due through July 15, 2017, with respect to the Rose Rock 2022 Notes, or May 15, 2019, with respect to the Rose Rock 2023 Notes, computed using a discount rate based on a published United States Treasury Rate plus 50 basis points, over the principal value of such Rose Rock Note. In the event of a change of control, Rose Rock is required to offer to repurchase the Rose Rock Notes at an amount equal to 101% of the principal plus accrued and unpaid interest. At December 31, 2015 , we were in compliance with the terms of the Rose Rock Indentures. Rose Rock credit facility Our Rose Rock senior secured revolving credit facility agreement provides for a revolving credit facility of $585 million and includes a $150 million sub-limit for letters of credit. The facility can be increased by not more than $200 million , subject to certain conditions. The credit agreement expires on September 20, 2018. At Rose Rock’s option, amounts borrowed under the credit agreement will bear interest at either the Eurodollar rate or an 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, 2015 , we had no outstanding cash borrowings on this credit facility. 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, 2015 , there were $35.3 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. 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 . 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, 2015 , we had $42.9 million of secured bilateral letters of credit outstanding and the interest rate in effect was 1.75% . At December 31, 2015 , we had $2.8 million in capitalized loan fees, net of accumulated amortization, which is recorded in other noncurrent assets and is being amortized over the life of the agreement. We recorded interest expense related to this facility of $6.9 million , $9.0 million and $8.7 million for the years ended December 31, 2015 , 2014 and 2013 , respectively, including amortization of debt issuance costs and interest on bilateral letters of credit. The credit agreement includes customary 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, dividends and other distributions, material changes in Rose Rock’s business and modifying certain documents. In addition, the agreement prohibits any commodity transactions that are not permitted by Rose Rock’s comprehensive risk management policy. The credit agreement restricts Rose Rock’s ability to make certain types of payments relating to its units, including the declaration or payment of cash distributions; provided that Rose Rock 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 Rose Rock’s material domestic subsidiaries and secured by a lien on substantially all of the property and assets of Rose Rock and the guarantors, subject to customary exceptions. At December 31, 2015 , we were in compliance with the terms of the credit agreement. SemMexico facilities During the year ended December 31, 2015 , SemMexico's credit facilities expired and, on May 22, 2015, SemMexico entered into a $100 million Mexican pesos (U.S. $5.8 million at the December 31, 2015 exchange rate) revolving credit facility, which matures in May 2018. There were no outstanding borrowings on the facility at December 31, 2015 . Borrowings are unsecured and bear interest at the bank prime rate in Mexico plus 1.50% . At December 31, 2015 , SemMexico had outstanding letters of credit of $292.8 million Mexican pesos (U.S. $16.9 million ). Fees charged on outstanding letters of credit were 0.25% . SemMexico recorded interest expense of $0.1 million , $0.2 million and $0.2 million during the years ended December 31, 2015 , 2014 and 2013 , respectively. At December 31, 2015 , we were in compliance with the terms of this facility. Scheduled principal payments The following table summarizes the scheduled principal payments as of December 31, 2015 (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. SemGroup Notes Rose Rock 2022 Notes Rose Rock 2023 Notes SemGroup Facility Rose Rock Facility SemMexico Facility Capital Leases Total For the year ended: December 31, 2016 $ — $ — $ — $ — $ — $ — $ 31 $ 31 December 31, 2017 — — — — — — 26 26 December 31, 2018 — — — 30,000 — — 26 30,026 December 31, 2019 — — — — — — — — December 31, 2020 — — — — — — — — Thereafter 300,000 400,000 350,000 — — — — 1,050,000 Total $ 300,000 $ 400,000 $ 350,000 $ 30,000 $ — $ — $ 83 $ 1,080,083 Fair value We estimate the fair value of the SemGroup Notes to be $279 million and the fair value of the Rose Rock 2022 Notes and 2023 Notes to be $337 million and $300 million , respectively at December 31, 2015 , based on transacted market prices for identical liabilities near the measurement date, which is categorized as a Level 2 measurement. We estimate that the fair value of our other long-term debt was not materially different than the recorded values at December 31, 2015 . 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 other debt outstanding at December 31, 2015 . This estimate is categorized as a Level 2 measurement.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Bankruptcy matters On July 22, 2008 (the "Petition Date"), SemGroup, L.P. and certain subsidiaries filed petitions for reorganization under Chapter 11 of the U.S. Bankruptcy Code. Also on July 22, 2008, SemGroup, L.P.'s Canadian subsidiaries filed for creditor protection in Canada. Later during 2008, certain other U.S. subsidiaries filed petitions for reorganization. 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 Corporation emerged from bankruptcy protection on November 30, 2009 (the "Emergence Date"). Claims reconciliation process A large number of parties made claims against us for obligations alleged to have been incurred prior to our predecessor's bankruptcy filing. 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. 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. Multiple lawsuits involving claims of wrongful death and personal injury were filed in Zavala County and Dimmit County, Texas. These lawsuits have been consolidated and the trial will be held in the District Court, 293rd Judicial District, Zavala County, Texas. The trial for cause number 15-01-13356-ZCV, Maribel Rodriguez and the Estate of David Rodriguez, et al., vs. Rose Rock Midstream Field Services, LLC, SemGroup Corporation, Rose Rock Midstream, L.P. and SemManagement LLC, et al., was set to begin on February 9, 2016, and has been postponed to April 12, 2016. 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. 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 ("the KDHE") initiated discussions during our bankruptcy proceeding regarding six of our sites in Kansas ( five owned by Crude Transportation and one owned by SemGas) that KDHE believes, based on their historical use, may have soil or groundwater contamination in excess of state standards. KDHE sought our agreement to undertake assessments of these sites to determine whether they are contaminated. We reached an agreement with KDHE on this matter and entered into a Consent Agreement and Final Order with KDHE to conduct environmental assessments on the sites and to pay KDHE’s costs associated with their oversight of this matter. We have conducted Phase II investigations at all sites. Four of the sites have limited amounts of soil contamination that will be excavated and/or remediated on site. Four of the sites appeared to have ground water contamination requiring further delineation and/or ongoing monitoring. Work plans have been submitted to, and approved by, the KDHE. One site has been closed. Groundwater beneath two sites is being monitored until contaminants achieve regulatory threshold for closure and will not require active remediation. Two sites are in the process of completing assessment and characterization and will be remediated if necessary. We do not anticipate any penalties or fines for these historical sites. 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 adverse 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 will be required to incur significant removal and restoration costs when we retire our natural gas gathering and processing facilities in Canada. We have recorded a liability associated with these obligations, which is reported within other noncurrent liabilities on the consolidated balance sheets. The following table summarizes the changes in this liability from December 31, 2012 through December 31, 2015 (in thousands): Balance, December 31, 2012 $ 40,105 Accretion 4,752 Payments made (808 ) Currency translation adjustments (2,864 ) Balance, December 31, 2013 41,185 Accretion 4,807 Payments made (514 ) Currency translation adjustments (3,524 ) Balance, December 31, 2014 41,954 Accretion 4,748 Payments made (511 ) Revaluation (26,000 ) Currency translation adjustments (4,245 ) Balance, December 31, 2015 $ 15,946 The December 31, 2015 liability was calculated using the $117.8 million cost we estimate we would incur to retire these facilities, discounted based on our risk-adjusted cost of borrowing and the estimated timing of remediation. The calculation of the liability for an asset retirement obligation requires the use of significant estimates, including those related to the length of time before the assets will be retired, cost inflation over the assumed life of the assets, actual remediation activities to be required, and the rate at which such obligations should be discounted. Future changes in these estimates could result in material changes in the value of the recorded liability. In addition, future changes in laws or regulations could require us to record additional asset retirement obligations. During the year ended December 31, 2015 , we completed a reevaluation of our asset retirement obligations and recorded reductions to the liability and offsetting asset of $26.0 million . The reduction was largely due to a change in the estimated timing of the retirement of the facilities. The $117.8 million estimated cost represents only our proportionate share of the obligations associated with these facilities. An additional $20.0 million of estimated costs are attributable to third-party owners’ proportionate share of the obligations. If an owner fails to perform on its obligations, the other owners (including SemGroup) could be obligated to bear that party’s share of the remediation costs. Our other segments may also be subject to removal and restoration costs upon retirement of their facilities. However, we are unable to predict when, or if, our pipelines, storage tanks and other 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 vehicles. Future minimum payments required under operating leases that have initial or remaining non-cancellable lease terms in excess of one year at December 31, 2015 are as follows (in thousands): For year ending: December 31, 2016 $ 9,218 December 31, 2017 7,001 December 31, 2018 3,055 December 31, 2019 1,941 December 31, 2020 157 Thereafter 6,814 Total future minimum lease payments $ 28,186 We recorded lease and rental expenses of $15.5 million , $16.2 million and $11.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Purchase and sale commitments We routinely enter into agreements to purchase and sell petroleum products at specified future dates. We account for these commitments as normal purchases and sales, and therefore we do not record assets or liabilities related to these agreements until the product is purchased or sold. At December 31, 2015 , such commitments included the following (in thousands): Volume (barrels) Value Fixed price purchases 1,976 $ 71,709 Fixed price sales 2,907 $ 116,329 Floating price purchases 17,361 $ 652,122 Floating price sales 19,691 $ 709,991 Certain of the commitments shown in the table above relate to agreements to purchase product from a counterparty and to sell a similar amount of product (in a different location) to the same counterparty. Many of the commitments shown in the table above are cancellable by either party, as long as notice is given within the time frame specified in the agreement (generally 30 to 120 days). Our SemGas segment has a take or pay contractual obligation related to the fractionation of natural gas liquids. This obligation continues through June 2023. At December 31, 2015 , approximately $110.7 thousand was due under the contract. The approximate amount of future obligation is as follows (in thousands): For year ending: December 31, 2016 $ 11,804 December 31, 2017 11,938 December 31, 2018 10,060 December 31, 2019 9,121 December 31, 2020 8,451 Thereafter 15,941 Total expected future payments $ 67,315 SemGas also enters into contracts under which we are responsible for marketing the majority of the gas and natural gas liquids produced by the counterparties to the agreements. The majority of SemGas’ revenues were generated from such contracts. Rose Rock has a throughput commitment with our equity method investee, White Cliffs, for approximately 5,000 barrels per day of space on White Cliffs' pipeline which became effective in October 2015 and has a term of five years. Annual payments to White Cliffs under the agreement are expected to be $9.4 million . Rose Rock has a throughput commitment for 5,000 barrels per day on the Dakota Access Pipeline which becomes effective upon the full service date of the pipeline which is expected in the fourth quarter of 2016. The commitment has a seven year term. Annual payments are expected to be $11.9 million . Capital expenditures We expect to spend $325 million for construction of the Maurepas Pipeline in 2016. See Note 5 for commitments related to the White Cliffs expansion project.

Equity

Equity	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Equity	EQUITY Common stock The par value of common stock reflected on the consolidated balance sheet at December 31, 2015 is summarized below: Class A Class B Shares accounted for at December 31, 2012 41,971,050 28,235 Issuance of shares under employee and director compensation programs (1) 107,988 — Shares issued upon exercise of warrants 425,618 — Shares accounted for at December 31, 2013 42,504,656 28,235 Conversion of Class B shares 28,235 (28,235 ) Issuance of shares under employee and director compensation programs (1) 169,933 — Shares issued under employee stock purchase plan 6,999 — Shares issued upon exercise of warrants 904,231 — Shares accounted for at December 31, 2014 43,614,054 — Issuance of shares under employee and director compensation programs (1) 184,803 — Shares issued under employee stock purchase plan 24,882 — Shares accounted for at December 31, 2015 (2) 43,823,739 — (1) Of these vested shares, recipients sold back to the Company 62,291 , 11,120 and 8,591 shares during the years ended December 31, 2015 , 2014 and 2013, respectively, to satisfy tax withholding obligations. These repurchased shares are being recognized at cost as treasury stock on the consolidated balance sheet. (2) In addition to the shares in the table above, there are shares of unvested restricted stock outstanding at December 31, 2015 . The par value of these shares has not yet been reflected in common stock on the consolidated balance sheet, as these shares have not yet vested. There are also shares of restricted stock that were returned to treasury upon forfeiture. The par value of these shares is not reflected in the consolidated balance sheet, as no accounting recognition is given to forfeited shares. Certain unvested restricted stock is considered legally issued and outstanding and is included in the number of shares presented on the consolidated balance sheets. The common stock includes Class A and Class B stock. Class A stock is eligible to be listed on an exchange, whereas Class B stock is not. Any share of Class B stock may be converted to Class A at the election of the holder. Both classes of stock have full voting rights. Both classes of stock have a par value of $0.01 per share. All Class B stock has been converted to Class A stock. The total number of shares authorized for issuance is 90,000,000 shares of Class A stock and 10,000,000 shares of Class B stock. Warrants Prior to November 30, 2014, we had outstanding common stock warrants which entitled the holder to purchase one share of common stock for $25 . Upon exercise, a holder could elect a cashless exercise, whereby the number of shares to be issued to the holder was reduced, in lieu of a cash payment. Changes in the fair value of warrants were recorded in "other expense (income)" in the consolidated statements of operations and comprehensive income. The warrants expired on November 30, 2014. Dividends We began paying a quarterly cash dividend in the second quarter of 2013. The following table sets forth the quarterly dividends per share declared and paid to shareholders for the periods indicated: Quarter Ending Dividend Per Share Date Declared Date of Record Date Paid June 30, 2013 $ 0.19 May 8, 2013 May 20, 2013 May 30, 2013 September 30, 2013 $ 0.20 August 8, 2013 August 19, 2013 August 30, 2013 December 31, 2013 $ 0.21 November 11, 2013 November 22, 2013 December 3, 2013 March 31, 2014 $ 0.22 February 25, 2014 March 10, 2014 March 20, 2014 June 30, 2014 $ 0.24 May 8, 2014 May 19, 2014 May 29, 2014 September 30, 2014 $ 0.27 August 6, 2014 August 18, 2014 August 28, 2014 December 31, 2014 $ 0.30 November 6, 2014 November 17, 2014 November 28, 2014 March 31, 2015 $ 0.34 February 26, 2015 March 9, 2015 March 20, 2015 June 30, 2015 $ 0.38 May 6, 2015 May 18, 2015 May 29, 2015 September 30, 2015 $ 0.42 August 4, 2015 August 17, 2015 August 25, 2015 December 31, 2015 $ 0.45 November 3, 2015 November 16, 2015 November 24, 2015 March 31, 2016 $ 0.45 February 24, 2016 March 7, 2016 March 17, 2016

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Earnings per share is calculated based on income from continuing and discontinued operations less any income attributable to noncontrolling interests. Income attributable to noncontrolling interests represents third-party limited partner unitholders' interests in the earnings of our consolidated subsidiary, Rose Rock. Rose Rock allocates net income to its limited partners based on the distributions pertaining to the current period's available cash as defined by Rose Rock's partnership agreement. After adjusting for the appropriate period's distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to Rose Rock's general partner, limited partners and participating securities in accordance with the contractual terms of Rose Rock's partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings. Basic earnings (loss) per share is calculated based on the weighted average shares outstanding during the period. Diluted earnings (loss) per share includes the dilutive effect of warrants and unvested equity compensation awards. The following summarizes the calculation of basic earnings per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 Continuing Operations Discontinued Operations Net Income $ 42,816 $ (4 ) $ 42,812 less: Income attributable to noncontrolling interest 12,492 — 12,492 Income attributable to SemGroup $ 30,324 $ (4 ) $ 30,320 Weighted average common stock outstanding 43,787 43,787 43,787 Basic earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2014 Continuing Operations Discontinued Operations Net Income $ 52,058 $ (1 ) $ 52,057 less: Income attributable to noncontrolling interest 22,817 — 22,817 Income attributable to SemGroup $ 29,241 $ (1 ) $ 29,240 Weighted average common stock outstanding 42,665 42,665 42,665 Basic earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2013 Continuing Operations Discontinued Operations Net Income $ 65,753 $ 59 $ 65,812 less: Income attributable to noncontrolling interest 17,710 — 17,710 Income attributable to SemGroup $ 48,043 $ 59 $ 48,102 Weighted average common stock outstanding 42,339 42,339 42,339 Basic earnings per share $ 1.13 $ 0.00 $ 1.14 The following summarizes the calculation of diluted earnings per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 Continuing Operations Discontinued Operations Net Income $ 42,816 $ (4 ) $ 42,812 less: Income attributable to noncontrolling interest 12,492 — 12,492 Income attributable to SemGroup $ 30,324 $ (4 ) $ 30,320 Weighted average common stock outstanding 43,787 43,787 43,787 Effect of dilutive securities 183 183 183 Diluted weighted average common stock outstanding 43,970 43,970 43,970 Diluted earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2014 Continuing Operations Discontinued Operations Net Income $ 52,058 $ (1 ) $ 52,057 less: Income attributable to noncontrolling interest 22,817 — 22,817 Income attributable to SemGroup $ 29,241 $ (1 ) $ 29,240 Weighted average common stock outstanding 42,665 42,665 42,665 Effect of dilutive securities 302 302 302 Diluted weighted average common stock outstanding 42,967 42,967 42,967 Diluted earnings per share $ 0.68 $ 0.00 $ 0.68 Year Ended December 31, 2013 Continuing Operations Discontinued Operations Net Income $ 65,753 $ 59 $ 65,812 less: Income attributable to noncontrolling interest 17,710 — 17,710 Income attributable to SemGroup $ 48,043 $ 59 $ 48,102 Weighted average common stock outstanding 42,339 42,339 42,339 Effect of dilutive securities 307 307 307 Diluted weighted average common stock outstanding 42,646 42,646 42,646 Diluted earnings per share $ 1.13 $ 0.00 $ 1.13 All outstanding warrants expired on November 30, 2014 and therefore have no dilutive effect for the years ended December 31, 2015 and 2014. For the year ended December 31, 2013, we recorded a loss on the change in the fair value of the warrants; because of this, the warrants did not cause any dilution for that period.

Equity-Based Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	EQUITY-BASED COMPENSATION SemGroup Corporation equity awards We have reserved a total of 2,781,635 shares of common stock for issuance pursuant to employee and director compensation programs. These awards give the recipients the right to receive shares of common stock, once specified service, performance or market related vesting conditions are met. The awards typically have one year vesting period for non-management directors and three years for employees. The awards may be subject to accelerated vesting in the event of involuntary terminations. We record expense for these awards (and corresponding increases to additional paid-in capital) based on the grant date fair value of the awards over the vesting period. We use authorized but unissued shares to satisfy our equity-based payment obligations. Although these awards are to be settled in shares, we may elect to give participants the option of surrendering a portion of the awards, to meet statutory minimum tax withholding requirements. The activity related to these awards during the period from December 31, 2012 to December 31, 2015 is summarized below: Unvested Shares Average Grant Date Fair Value Aggregate Fair Value of Shares (in thousands) Outstanding at December 31, 2012 450,552 $ 26.87 Awards granted - 2013 201,451 $ 52.78 Awards vested - 2013 (107,988 ) $ 25.71 $ 2,776 Awards forfeited - 2013 (13,412 ) $ 32.36 Outstanding at December 31, 2013 530,603 $ 36.80 Awards granted - 2014 207,786 $ 77.14 Awards vested - 2014 (169,340 ) $ 33.07 $ 5,600 Awards forfeited - 2014 (119,130 ) $ 42.16 Outstanding at December 31, 2014 449,919 $ 70.69 Awards granted - 2015 151,789 $ 77.93 Awards vested - 2015 (181,906 ) $ 35.18 $ 6,399 Awards forfeited - 2015 (8,494 ) $ 42.05 Outstanding at December 31, 2015 411,308 $ 75.25 Of the awards vested during the years ended December 31, 2015 , 2014 and 2013 , 62,291 , 11,120 and 8,591 shares were withheld to satisfy minimum tax requirements, respectively. For certain of the awards granted in 2015, 2014 and 2013, the number of shares that will vest is contingent upon our achievement of certain specified targets. Awards with performance conditions are valued based on the grant date closing price on the New York Stock Exchange based on the number of awards expected to vest. Awards with market conditions are valued using Monte Carlo simulations. The following table sets forth the assumptions used in the valuations of these awards granted in 2015, 2014 and 2013: 2015 2014 2013 Volatility 26.8% 29.3% 28.9% Risk-free interest rate 1.06% 0.66% 0.35% Volatility assumptions related to 2015 and 2014 awards containing a market condition were based on historical volatility using a simple average calculation of volatility over a period equal to the vesting period of the awards. We do not expect future volatility over the term of the awards to be significantly different from historical volatility. Volatility assumptions related to 2013 awards containing a market condition were comprised of 50% historical volatility and 50% implied volatility. We intend to use only historical volatility going forward. The change in assumption basis from 2014 to 2013 did not have a significant impact. If we meet the specified maximum targets, approximately 72 thousand , 51 thousand and 47 thousand additional shares could vest related to the 2015, 2014 and 2013 awards, respectively. The holders of certain restricted stock awards are entitled to equivalent dividends (“UDs”) to be received upon vesting of the restricted stock awards. The UDs are subject to the same forfeiture and acceleration conditions as the associated restricted stock awards. For awards granted prior to 2013, the dividends were settled in common shares based on the market price of our Class A shares as of the close of business on the vesting date. For the year ended December 31, 2015 , 1,793 shares were issued upon the vesting of these restricted stock awards. For the year ended December 31, 2014 , 593 shares were issued upon the vesting of these restricted stock awards. No shares were issued upon vesting of restricted stock awards for the year ended December 31, 2013. As of December 31, 2015 , all awards granted prior to 2013 have vested. UDs related to restricted stock awards granted after 2013 will be settled in cash upon vesting. At December 31, 2015 , the value of UDs to be settled in cash related to unvested restricted stock awards was approximately $595 thousand . Compensation costs expensed for the years ended December 31, 2015 , 2014 and 2013 were $9.1 million , $7.3 million and $6.5 million , respectively. As of December 31, 2015 , there was $13.0 million of total unrecognized compensation cost related to our non-vested awards, which is expected to be recognized over a weighted-average period of 17 months. Director Retainer During the year ended December 31, 2015 we issued 1,104 shares of common stock to a director in lieu of an annual cash retainer. Employee stock purchase plan Our employee stock purchase plan ("ESPP") allows eligible employees to contribute up to 10% of their base earnings toward the semi-annual purchase of our common stock, subject to an annual maximum dollar amount. The purchase price is 85% of the closing price on the last business day of the offering period. We have reserved a total of 1,000,000 shares of common stock for issuance under the ESPP. During the years ended December 31, 2015 and 2014 , we issued 24,882 and 6,999 shares under our ESPP, respectively. Rose Rock Midstream L.P. equity-based compensation Certain of our employees who support Rose Rock participate in Rose Rock's equity-based compensation program. Awards under this program generally represent awards of restricted common units representing limited partner interests of Rose Rock. Generally, the awards vest three years after the date of grant for employees and one year after the date of grant for non-management 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. Vesting of these awards dilutes our ownership interest. 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, 2012 43,960 $ 21.91 Awards granted - 2013 49,104 $ 34.41 Awards vested - 2013 (9,333 ) $ 27.25 $ 254 Awards forfeited - 2013 (783 ) $ 34.40 Outstanding at December 31, 2013 82,948 $ 28.59 Awards granted - 2014 46,536 $ 41.35 Awards vested - 2014 (5,712 ) $ 35.87 $ 205 Awards forfeited - 2014 (21,432 ) $ 29.82 Outstanding at December 31, 2014 102,340 $ 33.79 Awards granted - 2015 36,527 $ 39.03 Awards vested - 2015 (38,366 ) $ 27.54 $ 1,057 Awards forfeited - 2015 (310 ) $ 42.80 Outstanding at December 31, 2015 100,191 $ 38.70 Of the awards vested during the year ended December 31, 2015, 12,892 units were withheld to satisfy minimum tax requirements. No units were withheld to satisfy minimum tax requirements for the years ended December 31, 2014 and 2013. Compensation cost expensed for the years ended December 31, 2015 , 2014 and 2013 was $1.4 million , $0.9 million and $0.8 million , respectively, and represents an increase in noncontrolling interests in consolidated subsidiaries. As of December 31, 2015 , there was $1.9 million of total unrecognized compensation cost related to the non-vested awards, which is expected to be recognized over a weighted-average period of 14 months. The holders of certain of these restricted unit awards are entitled to equivalent distributions (“UUDs”) to be received upon vesting of the restricted unit awards. For awards granted prior to 2013, the UUDs were 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. For the year ended December 31, 2015 , 3,335 UUDs were issued upon the vesting of these restricted units. No UUD units were issued upon vesting of restricted units for the year ended December 31, 2014. For the year ended December 31, 2013, 406 UUDs were issued upon the vesting of these restricted units. As of December 31, 2015 , all awards granted prior to 2013 have vested. UUDs related to the restricted unit awards granted subsequent to 2013 will be settled in cash upon vesting. At December 31, 2015 , the value of these cash settled UUDs related to unvested restricted units was approximately $381 thousand .

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS Defined contribution plans We sponsor defined contribution retirement plans in which the majority of employees are eligible to participate. Our contributions to the defined contribution plans were $2.4 million , $1.9 million , and $1.1 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Pension plans We sponsor a defined benefit pension plan and a supplemental defined benefit pension plan (collectively, the “Pension Plans”) for certain employees of the SemCAMS segment hired before June 30, 2001. These plans are closed to new participants and do not accrue any additional benefits. We recognize the funded status of the Pension Plans, measured as the difference between the fair value of the plan assets and the projected benefit obligation, in the Consolidated Balance Sheets. The table below summarizes the balances of the projected benefit obligation and fair value of the plan assets at December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Projected benefit obligation $ 23,865 $ 29,266 Fair value of plan assets 22,204 26,368 Funded status: $ (1,661 ) $ (2,898 ) All of the plan's assets are invested in pooled funds that hold highly-liquid securities and are classified as Level 2 within the fair value hierarchy. We recorded other noncurrent liabilities of $1.7 million and $2.9 million at December 31, 2015 and 2014 , respectively, to reflect the funded status of the Pension Plans. We record changes in the funded status of the Pension Plans to other comprehensive income (loss), net of income taxes. These amounts were a gain of $0.7 million , a loss of $3.7 million and a gain of $4.8 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Retiree medical plan We sponsor an unfunded, post-employment health benefit plan (the “Health Plan”) for certain employees of the SemCAMS segment. The projected benefit obligation related to the Health Plan was $1.4 million at December 31, 2015 and $1.7 million at December 31, 2014 , and is reported within other noncurrent liabilities on the consolidated balance sheets.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table presents changes in the components of accumulated other comprehensive income (loss) (in thousands): Currency Translation Employee Benefit Plans Total Balance, December 31, 2012 $ 1,855 $ (3,154 ) $ (1,299 ) Currency translation adjustment, net of income tax benefit of $3,993 (6,363 ) — (6,363 ) Changes related to benefit plans, net of income tax expense of $1,603 — 4,808 4,808 Balance, December 31, 2013 (4,508 ) 1,654 (2,854 ) Currency translation adjustment, net of income tax benefit of $11,102 (20,551 ) — (20,551 ) Changes related to benefit plans, net of income tax benefit of $1,245 — (3,736 ) (3,736 ) Balance, December 31, 2014 (25,059 ) (2,082 ) (27,141 ) Currency translation adjustment, net of income tax benefit of $19,593 (32,142 ) — (32,142 ) Changes related to benefit plans, net of income tax expense of $240 — 721 721 Balance, December 31, 2015 $ (57,201 ) $ (1,361 ) $ (58,562 )

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	SUPPLEMENTAL CASH FLOW INFORMATION Operating assets and liabilities The following table summarizes the changes in the components of operating assets and liabilities, net of the effects of acquisitions (in thousands): Year Ended December 31, 2015 2014 2013 Decrease (increase) in restricted cash $ 6,764 $ (2,045 ) $ 29,467 Decrease (increase) in accounts receivable 9,051 (32,602 ) 11,172 Decrease (increase) in receivable from affiliates 10,905 50,454 (61,095 ) Decrease (increase) in inventories (31,043 ) (6,243 ) (11,352 ) Decrease (increase) in derivatives and margin deposits (2,109 ) 28 1,012 Decrease (increase) in other current assets (413 ) (614 ) 9,361 Decrease (increase) in other assets 4,015 2 137 Increase (decrease) in accounts payable and accrued liabilities 2,513 11,461 31,030 Increase (decrease) in payable to affiliates (8,427 ) (48,819 ) 62,279 Increase (decrease) in payables to pre-petition creditors (3,837 ) (54 ) (29,609 ) Increase (decrease) in other noncurrent liabilities (2,625 ) 5,067 (2,541 ) $ (15,206 ) $ (23,365 ) $ 39,861 Non-cash transactions During the years ended December 31, 2015 , 2014 and 2013, we recorded reductions of $51.5 million , $85.2 million and $180.2 million , respectively, to noncontrolling interests in consolidated subsidiaries and offsetting increases to additional paid-in capital of $30.7 million , $53.2 million and $112.9 million , respectively, (net of tax impacts of $20.8 million , $31.9 million and $67.3 million , respectively). These non-cash entries represent the portion of proceeds in excess of historical cost which were attributed to Rose Rock's third-party unitholders related to Rose Rock's common control acquisitions from SemGroup (Note 4). During the years ended December 31, 2014 and 2013, we issued 904,231 and 425,618 shares of Class A common stock, respectively, related to the exercise of warrants. These issuances resulted in the non-cash reclassifications for the years ended December 31, 2014 and 2013 of $73.0 million and $21.4 million , respectively, from other noncurrent liabilities to common stock and additional paid-in capital. Cash proceeds of $1.5 million and $0.2 million were received in connection with the warrant exercises for the years ended December 31, 2014 and 2013, respectively. Outstanding warrants expired in 2014. See Note 16 for discussion of non-cash change to ARO liability for the year ended December 31, 2015. Other supplemental disclosures We paid cash for interest totaling $64.9 million , $36.7 million and $23.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. We paid cash for income taxes (net of refunds received) in the amount of $7.3 million , $23.5 million and $13.9 million during the years ended December 31, 2015 , 2014 and 2013 , respectively. We accrued $11.8 million , $7.0 million and $10.1 million at December 31, 2015 , 2014 and 2013 , respectively, for purchases of property, plant and equipment. We sold common units of NGL Energy for proceeds of $88.8 million during the year ended December 31, 2014 (Note 5), of which only $79.7 million of proceeds from the sales had been received at December 31, 2014. We recorded an accrual for the proceeds that had not been received at December 31, 2014.

Quarterly Financial Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Quarterly Financial Data (Unaudited)	QUARTERLY FINANCIAL DATA (UNAUDITED) Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2015 is shown below (in thousands, except per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter Total Total revenues $ 298,310 $ 377,226 $ 397,065 $ 382,493 $ 1,455,094 Loss (gain) on disposal or impairment, net 1,058 1,372 (951 ) 9,993 11,472 Other operating costs and expenses 301,206 352,549 376,973 371,512 1,402,240 Total expenses 302,264 353,921 376,022 381,505 1,413,712 Earnings from equity method investments 20,559 23,903 16,237 20,687 81,386 Gain on issuance of common units by equity method investee — 5,897 136 352 6,385 Operating income 16,605 53,105 37,416 22,027 129,153 Other expenses, net 6,087 9,809 17,829 19,082 52,807 Income from continuing operations before income taxes 10,518 43,296 19,587 2,945 76,346 Income tax expense 4,742 14,861 10,006 3,921 33,530 Income from continuing operations 5,776 28,435 9,581 (976 ) 42,816 Loss from discontinued operations, net of income taxes — (2 ) (1 ) (1 ) (4 ) Net income 5,776 28,433 9,580 (977 ) 42,812 Less: net income (loss) attributable to noncontrolling interests 4,310 5,136 4,707 (1,661 ) 12,492 Net income attributable to SemGroup $ 1,466 $ 23,297 $ 4,873 $ 684 $ 30,320 Earnings per share—basic $ 0.03 $ 0.53 $ 0.11 $ 0.02 $ 0.69 Earnings per share—diluted $ 0.03 $ 0.53 $ 0.11 $ 0.02 $ 0.69 Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2014 is shown below (in thousands, except per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter Total Total revenues $ 498,883 $ 482,224 $ 594,235 $ 547,237 $ 2,122,579 Loss (gain) on disposal or impairment, net (58 ) 19,315 1,376 11,959 32,592 Other operating costs and expenses 478,264 471,863 575,936 530,150 2,056,213 Total expenses 478,206 491,178 577,312 542,109 2,088,805 Earnings from equity method investments 14,962 19,187 14,223 15,827 64,199 Gain on issuance of common units by equity method investee 8,127 — 18,772 2,121 29,020 Operating income 43,766 10,233 49,918 23,076 126,993 Other expenses (income), net 7,497 29,489 (6,368 ) (2,196 ) 28,422 Income (loss) from continuing operations before income taxes 36,269 (19,256 ) 56,286 25,272 98,571 Income tax expense (benefit) 16,526 (6,672 ) 24,090 12,569 46,513 Income (loss) from continuing operations 19,743 (12,584 ) 32,196 12,703 52,058 Income (loss) from discontinued operations, net of income taxes (5 ) — — 4 (1 ) Net income (loss) 19,738 (12,584 ) 32,196 12,707 52,057 Less: net income attributable to noncontrolling interests 6,150 5,025 6,934 4,633 22,817 Net income (loss) attributable to SemGroup $ 13,588 $ (17,609 ) $ 25,262 $ 8,074 $ 29,240 Earnings (loss) per share—basic $ 0.32 $ (0.41 ) $ 0.59 $ 0.19 $ 0.69 Earnings (loss) per share—diluted $ 0.29 $ (0.41 ) $ 0.59 $ 0.18 $ 0.68

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS NGL Energy Partners LP As described in Note 5, we own interests in NGL Energy, which we account for under the equity method. During the years ended December 31, 2015 , 2014 and 2013 , we generated the following transactions with NGL Energy and its subsidiaries (in thousands): Year Ended December 31, 2015 2014 2013 Revenues $ 157,732 $ 456,987 $ 796,440 Purchases $ 138,095 $ 437,015 $ 669,450 Reimbursements from NGL Energy for services $ 56 $ 168 $ 198 White Cliffs We generated approximately $4.8 million , $2.9 million and $2.9 million of revenue from services we provided to White Cliffs during the years ended December 31, 2015 , 2014 and 2013 , respectively. We incurred $5.2 million and $3.9 million of cost for the years ended December 31, 2015 and 2014, respectively, related to transportation fees for shipments on the White Cliffs Pipeline. Glass Mountain We incurred $5.1 million and $0.8 million of cost for the years ended December 31, 2015 and 2014, respectively, related to product purchases and transportation fees for shipments on the Glass Mountain Pipeline. We received $0.8 million and $0.7 million in fees from Glass Mountain for the years ended December 31, 2015 and 2014, respectively, related to support and administrative services associated with 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. Mr. Berman does not perform any legal services for us. SemGroup paid $1.3 million , $1.3 million and $1.9 million in legal fees and related expenses to this law firm during the years ended December 31, 2015 , 2014 and 2013 , respectively (of which $3.4 thousand , $0.1 million and $0.2 million was paid by White Cliffs, respectively).

Condensed Consolidating Guarant

Condensed Consolidating Guarantor Financial Statements	12 Months Ended
	Dec. 31, 2015
Condensed Consolidating Guarantor Financial Statements [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	CONDENSED CONSOLIDATING GUARANTOR FINANCIAL STATEMENTS We have outstanding $300 million of 7.50% senior unsecured notes due 2021 (the “SemGroup Notes”). The SemGroup Notes are guaranteed by certain of our subsidiaries as follows: SemGas, L.P., SemMaterials, L.P., SemGroup Europe Holding, L.L.C., SemOperating G.P., L.L.C., SemMexico, L.L.C., SemDevelopment, L.L.C., Rose Rock Midstream Holdings, LLC and Mid-America Midstream Gas Services, L.L.C. (collectively, the "Guarantors"). The guarantees of the SemGroup Notes are full and unconditional and constitute the joint and several obligations of the Guarantors. Each of the Guarantors is 100% owned by SemGroup Corporation (the "Parent"). There are no significant restrictions upon the ability of the Parent or any of the Guarantors to obtain funds from its respective subsidiaries by dividend or loan. None of the assets of the Guarantors represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X under the Securities Act of 1933, as amended. In February 2015, we contributed our interests in Wattenberg Holding, LLC and Glass Mountain Holding, LLC to Rose Rock (Note 4). As a result of this transaction, Wattenberg Holding, LLC and Glass Mountain Holding, LLC no longer guarantee our SemGroup Notes. In June 2015, SemCanada, L.P. and SemCanada II, L.P. were released as Guarantors and no longer guarantee our SemGroup Notes. Prior period comparative information has been recast to reflect Wattenberg Holding, LLC, Glass Mountain Holding, LLC, SemCanada, L.P. and SemCanada II, L.P. as non-guarantors. Condensed consolidating financial statements for the Parent, the Guarantors and non-guarantors as of December 31, 2015 and 2014 and for the years ended December 31, 2015 , 2014 and 2013 are presented on an equity method basis in the tables below (in thousands). Intercompany receivable and payable balances, including notes receivable and payable, are capital transactions primarily to facilitate the capital needs of our subsidiaries. As such, subsidiary intercompany balances have been reported as a reduction to equity on the condensed consolidating Guarantor balance sheets. The Parent's net intercompany balance, including note receivable, and investments in subsidiaries have been reported in equity method investments on the condensed consolidating Guarantor balance sheets. Intercompany transactions, such as daily cash management activities, have been reported as financing activities within the condensed consolidating Guarantor statements of cash flows. Quarterly cash distributions from Rose Rock representing a return on capital have been included in the Parent's cash flows from operations. Dispositions of the Parent's investments in subsidiaries have been treated as investing activities in the cash flow statement, consistent with the presentation of investments in subsidiaries as equity method investments. These balances are eliminated through consolidating adjustments below. Condensed Consolidating Guarantor Balance Sheets December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 4,559 $ — $ 55,101 $ (1,564 ) $ 58,096 Restricted cash — — 32 — 32 Accounts receivable 640 20,015 306,058 — 326,713 Receivable from affiliates 1,616 1,119 6,141 (2,962 ) 5,914 Inventories — (48 ) 70,287 — 70,239 Other current assets 8,477 359 10,551 — 19,387 Total current assets 15,292 21,445 448,170 (4,526 ) 480,381 Property, plant and equipment 4,335 536,628 1,025,858 — 1,566,821 Equity method investments 1,546,853 426,801 438,291 (1,860,867 ) 551,078 Goodwill — 13,052 34,980 — 48,032 Other intangible assets 20 144,183 18,020 — 162,223 Other noncurrent assets, net 43,898 881 17,376 — 62,155 Total assets $ 1,610,398 $ 1,142,990 $ 1,982,695 $ (1,865,393 ) $ 2,870,690 LIABILITIES AND OWNERS’ EQUITY Current liabilities: Accounts payable $ 734 $ 11,221 $ 261,711 $ — $ 273,666 Payable to affiliates 78 155 7,762 (2,962 ) 5,033 Accrued liabilities 5,551 10,957 68,534 5 85,047 Deferred revenue — — 11,349 — 11,349 Other current liabilities 569 — 1,332 — 1,901 Current portion of long-term debt — — 31 — 31 Total current liabilities 6,932 22,333 350,719 (2,957 ) 377,027 Long-term debt 330,000 7,340 761,097 (23,840 ) 1,074,597 Deferred income taxes 155,411 — 45,542 — 200,953 Other noncurrent liabilities 2,528 — 19,229 — 21,757 Commitments and contingencies Owners’ equity excluding noncontrolling interests in consolidated subsidiaries 1,115,527 1,113,317 725,279 (1,838,596 ) 1,115,527 Noncontrolling interests in consolidated subsidiaries — — 80,829 — 80,829 Total owners’ equity 1,115,527 1,113,317 806,108 (1,838,596 ) 1,196,356 Total liabilities and owners’ equity $ 1,610,398 $ 1,142,990 $ 1,982,695 $ (1,865,393 ) $ 2,870,690 December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 9,254 $ — $ 35,445 $ (4,101 ) $ 40,598 Restricted cash 3,856 — 3,124 — 6,980 Accounts receivable 9,669 32,056 309,609 — 351,334 Receivable from affiliates 2,512 6,624 15,659 (7,976 ) 16,819 Inventories — 248 43,284 — 43,532 Other current assets 10,498 575 8,944 — 20,017 Total current assets 35,789 39,503 416,065 (12,077 ) 479,280 Property, plant and equipment 4,112 452,352 800,361 — 1,256,825 Equity method investments 1,551,825 348,115 415,673 (1,737,693 ) 577,920 Goodwill — 13,052 45,274 — 58,326 Other intangible assets 26 152,383 20,656 — 173,065 Other noncurrent assets, net 24,555 958 18,873 — 44,386 Total assets $ 1,616,307 $ 1,006,363 $ 1,716,902 $ (1,749,770 ) $ 2,589,802 LIABILITIES AND OWNERS’ EQUITY Current liabilities: Accounts payable $ 649 $ 22,097 $ 234,431 $ — $ 257,177 Payable to affiliates 21 7 21,406 (7,974 ) 13,460 Accrued liabilities 11,993 17,575 63,126 — 92,694 Payables to pre-petition creditors 3,129 — — — 3,129 Deferred revenue — — 23,688 — 23,688 Other current liabilities 224 707 543 — 1,474 Current portion of long-term debt — — 40 — 40 Total current liabilities 16,016 40,386 343,234 (7,974 ) 391,662 Long-term debt 335,000 — 490,946 (58,854 ) 767,092 Deferred income taxes 112,897 — 49,059 — 161,956 Other noncurrent liabilities 2,886 — 46,769 — 49,655 Commitments and contingencies Owners’ equity excluding noncontrolling interests in consolidated subsidiaries 1,149,508 965,977 716,965 (1,682,942 ) 1,149,508 Noncontrolling interests in consolidated subsidiaries — — 69,929 — 69,929 Total owners’ equity 1,149,508 965,977 786,894 (1,682,942 ) 1,219,437 Total liabilities and owners’ equity $ 1,616,307 $ 1,006,363 $ 1,716,902 $ (1,749,770 ) $ 2,589,802 Condensed Consolidating Guarantor Statements of Operations Year Ended December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 190,900 $ 948,576 $ (20,590 ) $ 1,118,886 Service — 58,690 200,852 — 259,542 Other — — 76,666 — 76,666 Total revenues — 249,590 1,226,094 (20,590 ) 1,455,094 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 142,576 857,563 (20,590 ) 979,549 Operating — 34,407 190,036 — 224,443 General and administrative 29,914 9,935 57,517 — 97,366 Depreciation and amortization 1,522 31,395 67,965 — 100,882 Loss on disposal or impairment, net — 142 11,330 — 11,472 Total expenses 31,436 218,455 1,184,411 (20,590 ) 1,413,712 Earnings from equity method investments 65,513 47,352 76,355 (107,834 ) 81,386 Gain on issuance of common units by equity method investee 6,385 — — — 6,385 Operating income 40,462 78,487 118,038 (107,834 ) 129,153 Other expenses (income): Interest expense 2,230 26,476 42,926 (1,957 ) 69,675 Foreign currency transaction gain (5 ) — (1,062 ) — (1,067 ) Other income, net (16,565 ) — (1,193 ) 1,957 (15,801 ) Total other expenses (income), net (14,340 ) 26,476 40,671 — 52,807 Income from continuing operations before income taxes 54,802 52,011 77,367 (107,834 ) 76,346 Income tax expense 24,482 — 9,048 — 33,530 Income from continuing operations 30,320 52,011 68,319 (107,834 ) 42,816 Loss from discontinued operations, net of income taxes — (3 ) (1 ) — (4 ) Net income 30,320 52,008 68,318 (107,834 ) 42,812 Less: net income attributable to noncontrolling interests — — 12,492 — 12,492 Net income attributable to SemGroup $ 30,320 $ 52,008 $ 55,826 $ (107,834 ) $ 30,320 Net income $ 30,320 $ 52,008 $ 68,318 $ (107,834 ) $ 42,812 Other comprehensive income (loss), net of income taxes 17,420 430 (49,271 ) — (31,421 ) Comprehensive income 47,740 52,438 19,047 (107,834 ) 11,391 Less: comprehensive income attributable to noncontrolling interests — — 12,492 — 12,492 Comprehensive income (loss) attributable to SemGroup $ 47,740 $ 52,438 $ 6,555 $ (107,834 ) $ (1,101 ) Year Ended December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 338,621 $ 1,479,543 $ (37,850 ) $ 1,780,314 Service — 37,139 196,100 — 233,239 Other — — 109,026 — 109,026 Total revenues — 375,760 1,784,669 (37,850 ) 2,122,579 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 273,309 1,387,899 (37,850 ) 1,623,358 Operating — 32,132 214,481 — 246,613 General and administrative 22,394 9,328 56,123 — 87,845 Depreciation and amortization 1,678 25,714 71,005 — 98,397 Loss (gain) on disposal or impairment, net 5,945 54,698 (28,051 ) — 32,592 Total expenses 30,017 395,181 1,701,457 (37,850 ) 2,088,805 Earnings from equity method investments 48,760 71,786 54,098 (110,445 ) 64,199 Gain on issuance of common units by equity method investee 29,020 — — — 29,020 Operating income 47,763 52,365 137,310 (110,445 ) 126,993 Other expenses (income): Interest expense 8,423 9,265 34,661 (3,305 ) 49,044 Foreign currency transaction gain — — (86 ) — (86 ) Other expenses (income), net (24,092 ) 500 (249 ) 3,305 (20,536 ) Total other expenses (income), net (15,669 ) 9,765 34,326 — 28,422 Income from continuing operations before income taxes 63,432 42,600 102,984 (110,445 ) 98,571 Income tax expense 34,192 — 12,321 — 46,513 Income from continuing operations 29,240 42,600 90,663 (110,445 ) 52,058 Loss from discontinued operations, net of income taxes — — (1 ) — (1 ) Net income 29,240 42,600 90,662 (110,445 ) 52,057 Less: net income attributable to noncontrolling interests — — 22,817 — 22,817 Net income attributable to SemGroup $ 29,240 $ 42,600 $ 67,845 $ (110,445 ) $ 29,240 Net income $ 29,240 $ 42,600 $ 90,662 $ (110,445 ) $ 52,057 Other comprehensive income (loss), net of income taxes 5,159 — (29,446 ) — (24,287 ) Comprehensive income 34,399 42,600 61,216 (110,445 ) 27,770 Less: comprehensive income attributable to noncontrolling interests — — 22,817 — 22,817 Comprehensive income attributable to SemGroup $ 34,399 $ 42,600 $ 38,399 $ (110,445 ) $ 4,953 Year Ended December 31, 2013 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 224,072 $ 944,984 $ (23,952 ) $ 1,145,104 Service — 3,192 137,006 — 140,198 Other — — 141,714 — 141,714 Total revenues — 227,264 1,223,704 (23,952 ) 1,427,016 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 166,735 877,317 (23,952 ) 1,020,100 Operating — 19,792 203,793 — 223,585 General and administrative 21,560 9,167 47,870 — 78,597 Depreciation and amortization 2,001 13,909 50,499 — 66,409 Loss (gain) on disposal or impairment, net — 668 (907 ) — (239 ) Total expenses 23,561 210,271 1,178,572 (23,952 ) 1,388,452 Earnings from equity method investments 67,965 49,825 44,099 (109,412 ) 52,477 Gain on issuance of common units by equity method investee 26,873 — — — 26,873 Operating income 71,277 66,818 89,231 (109,412 ) 117,914 Other expenses (income): Interest expense 4,826 9,700 16,028 (5,412 ) 25,142 Foreign currency transaction gain — — (1,633 ) — (1,633 ) Other expense (income), net 40,928 — (434 ) 5,412 45,906 Total other expenses, net 45,754 9,700 13,961 — 69,415 Income from continuing operations before income taxes 25,523 57,118 75,270 (109,412 ) 48,499 Income tax expense (benefit) (22,579 ) — 5,325 — (17,254 ) Income from continuing operations 48,102 57,118 69,945 (109,412 ) 65,753 Income (loss) from discontinued operations, net of income taxes — 65 (6 ) — 59 Net income 48,102 57,183 69,939 (109,412 ) 65,812 Less: net income attributable to noncontrolling interests — — 17,710 — 17,710 Net income attributable to SemGroup $ 48,102 $ 57,183 $ 52,229 $ (109,412 ) $ 48,102 Net income $ 48,102 $ 57,183 $ 69,939 $ (109,412 ) $ 65,812 Other comprehensive loss, net of income taxes (1,517 ) — (38 ) — (1,555 ) Comprehensive income 46,585 57,183 69,901 (109,412 ) 64,257 Less: comprehensive income attributable to noncontrolling interests — — 17,710 — 17,710 Comprehensive income attributable to SemGroup $ 46,585 $ 57,183 $ 52,191 $ (109,412 ) $ 46,547 Condensed Consolidating Guarantor Statements of Cash Flows Year Ended December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 37,259 $ 39,786 $ 141,899 $ (37,182 ) $ 181,762 Cash flows from investing activities: Capital expenditures (1,740 ) (110,729 ) (367,061 ) — (479,530 ) Proceeds from sale of long-lived assets — 35 3,653 — 3,688 Contributions to equity method investments — — (46,730 ) — (46,730 ) Proceeds from sale of common units of equity method investee 56,318 — — — 56,318 Proceeds from the sale of Wattenberg Holding, LLC and Glass mountain Holding, LLC to Rose Rock Midstream L.P. 251,181 — — (251,181 ) — Distributions in excess of equity in earnings of affiliates 35,340 — 24,113 (35,340 ) 24,113 Net cash provided by (used in) investing activities 341,099 (110,694 ) (386,025 ) (286,521 ) (442,141 ) Cash flows from financing activities: Debt issuance costs (601 ) — (5,688 ) — (6,289 ) Borrowings on credit facilities and issuance of senior unsecured notes 181,000 — 686,208 — 867,208 Principal payments on credit facilities and other obligations (186,000 ) — (374,049 ) — (560,049 ) Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs — — 89,119 — 89,119 Distributions to noncontrolling interests — — (40,410 ) — (40,410 ) Repurchase of common stock for payment of statutory taxes due on equity-based compensation (4,261 ) — — — (4,261 ) Dividends paid (69,514 ) — — — (69,514 ) Proceeds from issuance of common stock under employee stock purchase plan 1,223 — — — 1,223 Intercompany borrowings (advances), net (304,900 ) 70,908 (92,248 ) 326,240 — Net cash provided by (used in) financing activities (383,053 ) 70,908 262,932 326,240 277,027 Effect of exchange rate changes on cash and cash equivalents — — 850 — 850 Change in cash and cash equivalents (4,695 ) — 19,656 2,537 17,498 Cash and cash equivalents at beginning of period 9,254 — 35,445 (4,101 ) 40,598 Cash and cash equivalents at end of period $ 4,559 $ — $ 55,101 $ (1,564 ) $ 58,096 Year Ended December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 27,393 $ 57,976 $ 186,578 $ (90,289 ) $ 181,658 Cash flows from investing activities: Capital expenditures (1,672 ) (155,392 ) (113,442 ) — (270,506 ) Proceeds from sale of long-lived assets — 2,368 2,077 — 4,445 Contributions to equity method investments — — (71,131 ) — (71,131 ) Payments to acquire businesses — (514 ) (43,994 ) — (44,508 ) Proceeds from sale of common units of equity method investee 79,741 — — — 79,741 Proceeds from the sale of interest in SemCrude Pipeline, L.L.C. to Rose Rock Midstream, L.P. 114,412 — — (114,412 ) — Distributions in excess of equity in earnings of affiliates 1,843 — 11,734 (1,843 ) 11,734 Net cash provided by (used in) investing activities 194,324 (153,538 ) (214,756 ) (116,255 ) (290,225 ) Cash flows from financing activities: Debt issuance costs (93 ) — (8,593 ) — (8,686 ) Borrowings on debt 405,500 — 848,744 — 1,254,244 Principal payments on debt and other obligations (440,500 ) — (661,772 ) — (1,102,272 ) Distributions to noncontrolling interests — — (28,494 ) — (28,494 ) Proceeds from warrant exercises 1,451 — — — 1,451 Repurchase of common stock (719 ) — — — (719 ) Dividends paid (44,206 ) — — — (44,206 ) Proceeds from issuance of common stock under employee stock purchase plan 340 — — — 340 Excess tax benefit from equity-based awards 1,650 — — — 1,650 Intercompany borrowings (advances), net (138,431 ) 95,562 (161,110 ) 203,979 — Net cash provided by (used in) financing activities (215,008 ) 95,562 (11,225 ) 203,979 73,308 Effect of exchange rate changes on cash and cash equivalents — — (3,494 ) — (3,494 ) Change in cash and cash equivalents 6,709 — (42,897 ) (2,565 ) (38,753 ) Cash and cash equivalents at beginning of period 2,545 — 78,342 (1,536 ) 79,351 Cash and cash equivalents at end of period $ 9,254 $ — $ 35,445 $ (4,101 ) $ 40,598 Year Ended December 31, 2013 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 20,130 $ 23,230 $ 150,284 $ (20,235 ) $ 173,409 Cash flows from investing activities: Capital expenditures (734 ) (96,909 ) (117,966 ) — (215,609 ) Proceeds from sale of long-lived assets 23 19 1,237 — 1,279 Contributions to equity method investments (18,775 ) — (155,093 ) — (173,868 ) Payments to acquire businesses — (313,487 ) (48,969 ) — (362,456 ) Proceeds from the sale of SemStream assets 362,600 — — (362,600 ) — Distributions in excess of equity in earnings of affiliates — — 12,246 — 12,246 Net cash provided by (used in) investing activities 343,114 (410,377 ) (308,545 ) (362,600 ) (738,408 ) Cash flows from financing activities: Debt issuance costs (10,866 ) — (4,070 ) — (14,936 ) Borrowings on credit facilities 706,000 — 562,474 — 1,268,474 Principal payments on credit facilities and other obligations (537,500 ) — (321,912 ) — (859,412 ) Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs — — 210,226 — 210,226 Distributions to noncontrolling interests — — (17,647 ) — (17,647 ) Proceeds from warrant exercises 225 — — — 225 Repurchase of common stock (371 ) — — — (371 ) Dividends paid (25,429 ) — — — (25,429 ) Intercompany borrowings (advances), net (511,881 ) 387,147 (259,503 ) 384,237 — Net cash provided by (used in) financing activities (379,822 ) 387,147 169,568 384,237 561,130 Effect of exchange rate changes on cash and cash equivalents — — 3,191 — 3,191 Change in cash and cash equivalents (16,578 ) — 14,498 1,402 (678 ) Cash and cash equivalents at beginning of period 19,123 — 63,844 (2,938 ) 80,029 Cash and cash equivalents at end of period $ 2,545 $ — $ 78,342 $ (1,536 ) $ 79,351

Consolidation and Basis of Pr32

Consolidation and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2015
Consolidation and Basis of Presentation [Abstract]
Consolidation, Policy [Policy Text Block]	The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States. Consolidated subsidiaries Our consolidated financial statements include the accounts of our controlled subsidiaries, including Rose Rock Midstream, L.P. ("Rose Rock"). All significant transactions between our consolidated subsidiaries have been eliminated. Outside ownership interests in consolidated subsidiaries are reported as noncontrolling interests in the consolidated financial statements. In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis,” which adds requirements that limited partnerships must meet to qualify as voting interest entities and modifies the evaluation of whether limited partnerships are variable interest entities or voting interest entities. It also eliminates the presumption that a general partner should consolidate a limited partnership. This guidance is effective for public companies for fiscal years beginning after December 15, 2015. The Company will adopt this guidance in the first quarter of 2016. The impact is not expected to be material. Proportionally consolidated assets Our SemCAMS segment owns undivided interests in certain natural gas gathering and processing assets, for which we record only our proportionate share of the assets on the consolidated balance sheets. The net book value of the property, plant and equipment recorded by us associated with these undivided interests is approximately $273.0 million at December 31, 2015 . We serve as operator of these facilities and incur the costs of operating the facilities (recorded as operating expenses in the consolidated statements of operations) and charge the other owners for their proportionate share of the costs (recorded as other revenue in the consolidated statements of operations).

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
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 impact depreciation; (3) estimated fair values used in impairment tests; (4) fair values of derivative instruments; (5) valuation allowances for deferred tax 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.
Restricted Cash	RESTRICTED CASH —During the year ended December 31, 2015 , we completed the process of disbursing funds held in reserve accounts to settle pre-petition claims related to our predecessor's bankruptcy. Of the restricted cash balance of $7.0 million at December 31, 2014 , approximately $3.8 million was restricted for this purpose. See "Payables to Pre-petition Creditors" below.
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.
Inventories	INVENTORIES —Inventories primarily consist of crude oil and asphalt. 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. 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. In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory," which requires that inventory within the scope of the guidance be measured at the lower of cost and net realizable value rather than the lower of cost or market. The standard will be effective for public business entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The new guidance shall be applied prospectively and early adoption is permitted. The Company will adopt this guidance in the first quarter of 2017. The impact is not expected to be material.
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 as a gain or loss on disposal or impairment in the consolidated statements of operations. Our SemCAMS segment operates plants which periodically undergo planned major maintenance activities, typically occurring every four to five years. Planned major maintenance projects that do not increase the overall life or capacity of the related assets are recorded in operating expense as incurred, whereas major maintenance activity costs that materially increase the life or capacity of the underlying assets are capitalized. When maintenance expenses are recoverable from the producers who use the plants, they are recorded as revenue, and typically include a 10% overhead fee. Depreciation is calculated primarily on the straight-line method over the following estimated useful lives: Pipelines and related facilities 10 – 31 years Storage and terminal facilities 10 – 25 years Natural gas gathering and processing facilities 10 – 31 years Trucking equipment and other 3 – 7 years Office property and equipment 3 – 31 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 reporting unit to which the goodwill relates and comparing this fair value to the net book value of the reporting unit. 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 1 of each year.
Intangible Assets	INTANGIBLE ASSETS —Intangible assets are stated at cost, net of accumulated amortization, which is recorded on a straight-line or accelerated 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 operations 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. When an equity method investee issues additional ownership interests which dilute our ownership interest, we recognize a gain or loss in our consolidated statements of operations. We assess our equity method investments for impairment when circumstances indicate that the carrying value may not be recoverable and record an impairment when a decline in value is considered to be other than temporary. For equity method investments for which we do not expect financial information to be consistently available on a timely basis to apply the equity method currently, our policy is to apply the equity method consistently on a one-quarter lag.
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. In April 2015, the FASB issued ASU 2015-03, “Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs,” which is designed to simplify presentation of debt issuance costs. The standard requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB issued ASU 2015-15, “Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting,” which amended the SEC paragraphs of ASC Subtopic 835-30 to include the language from the SEC Staff Announcement indicating that the SEC would not object to presenting deferred debt issuance costs related to line-of-credit agreements as assets and subsequently amortizing the deferred debt issuance costs ratably over the term of the agreement. The standards will be effective for U.S. public companies for annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The new guidance shall be applied on a retrospective basis for all periods presented. The Company will adopt this guidance in the first quarter of 2016. The impact is not expected to be material.
Commodity Derivative Instruments	COMMODITY DERIVATIVE INSTRUMENTS —We generally record the fair value of commodity 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 13, the fair value of commodity derivatives at December 31, 2015 and 2014 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 are not generally netted against derivative assets or liabilities. 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 that would ordinarily meet the definition of a derivative but instead 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.
Payables to Pre-Petition Creditors	PAYABLES TO PRE-PETITION CREDITORS —During the year ended December 31, 2015 , we completed the process of disbursing funds held in reserve accounts to settle pre-petition claims related to our predecessor's bankruptcy. At December 31, 2014 , we recorded a liability of $3.1 million associated with these obligations and a liability of $0.7 million which is associated with discontinued operations and is reported within other current liabilities. Cash was held in accounts restricted for this purpose which was included in Restricted Cash on the balance sheet.
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 —Sales of product, as well as gathering and marketing revenues, are recognized at the time title to the product transfers to the purchaser, which typically occurs upon receipt of the product by the purchaser. Terminal and storage revenues are recognized at the time the service is performed. Revenue for the transportation of product is recognized upon delivery of the product to its destination. Certain revenue transactions are reported on a net basis, including certain buy/sell transactions (see “Purchases and Sales of Inventory with the Same Counterparty”). Other revenue primarily represents operating cost recovery from working interest owners in certain processing plants and is recorded when earned in accordance with the terms of related agreements. Taxes collected from customers and remitted to governmental authorities are recorded on a net basis (excluded from revenue). In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers," which supersedes nearly all existing revenue recognition guidance under accounting principles generally accepted in the United States ("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 permits 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). In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 by one year. 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. We will adopt this guidance in the first quarter of 2018.
Costs of Products Sold	COSTS OF PRODUCTS SOLD —Costs of products sold consists of the cost to purchase the product, the cost to transport the product to the point of sale, and the cost to store the product until it is sold.
Purchases 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.
Currency Translation	CURRENCY TRANSLATION —The consolidated financial statements are presented in U.S. dollars. Our segments operate in four countries, and each segment has identified a “functional currency,” which is the primary currency in the environment in which the segment operates. The functional currencies include the U.S. dollar, the Canadian dollar, the British pound sterling, and the Mexican peso. At the end of each reporting period, the assets and liabilities of each segment are translated from its functional currency to U.S. dollars using the exchange rate at the end of the month. The monthly results of operations of each segment are generally translated from its functional currency to U.S. dollars using the average exchange rate during the month. Changes in exchange rates result in currency translation gains and losses, which are recorded within other comprehensive income (loss). Certain segments also enter into transactions in currencies other than their functional currencies. At the end of each reporting period, each segment re-measures the related receivables, payables, and cash to its functional currency using the exchange rate at the end of the period. Changes in exchange rates between the time the transactions were entered into and the end of the reporting period result in currency transaction gains or losses, which are recorded in the consolidated statements of operations.
Income Taxes	INCOME TAXES —Deferred income taxes are accounted for under the liability method, which takes into account the differences between the basis of the assets and liabilities for financial reporting purposes and amounts recognized for income tax purposes. We record valuation allowances on deferred tax assets when, in the opinion of management, it is more likely than not that the asset will not be recovered. We monitor uncertain tax positions and we recognize tax benefits only when management believes the relevant tax positions would more likely than not be sustained upon examination. We record any interest and any penalties related to income taxes within income tax expense in the consolidated statements of operations. In November 2015, the FASB issues ASU 2015-17, "Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes," which requires all deferred tax assets and liabilities to be classified as noncurrent in the statement of financial position. For public entities, this ASU is effective for annual periods beginning after December 15, 2016, and interim periods within those years. The new guidance may be applied prospectively or retrospectively and early adoption is permitted. The Company has not determined which method we will apply when we adopt the standard. The Company intends to adopt this guidance in the first quarter of 2017. The impact is not expected to be material.
Reclassifications	RECLASSIFICATIONS —Certain reclassifications have been made to conform prior year balances to the current year presentation.
Pension Benefits	PENSION BENEFITS —Pension cost and obligations are actuarially determined and are affected by assumptions including expected return on plan assets, discount rates, compensation increases, and employee turnover rates. We evaluate our assumptions periodically and make adjustments to these assumptions and the recorded liability as necessary. Actuarial gains or losses are amortized on a straight-line basis over the expected remaining service life of employees in the pension plan.
Equity-Based Compensation	EQUITY-BASED COMPENSATION —We grant certain of our employees and non-managerial directors equity-based compensation awards which vest contingent on continued service of the recipient and, in some cases, on their achievement of specific performance targets or market conditions. We record compensation expense for these outstanding awards over applicable service or performance periods based on their grant date fair value with a corresponding increase to additional paid-in capital. The expense to be recorded over the life of the awards is discounted for expected forfeitures during the vesting period.
Noncontrolling interests in consolidated subsidiaries	NONCONTROLLING INTERESTS IN CONSOLIDATED SUBSIDIARIES —Noncontrolling interests represents third-party limited partner unitholders' interests in our consolidated subsidiary, Rose Rock. Rose Rock allocates net income to its limited partners based on the distributions pertaining to the current period's available cash as defined by Rose Rock's partnership agreement. After adjusting for the appropriate period's distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to Rose Rock's general partner, limited partners and participating securities in accordance with the contractual terms of Rose Rock's partnership agreement and as further prescribed under the two-class method. Incentive distribution rights do not participate in undistributed earnings.
Comprehensive Income	COMPREHENSIVE INCOME (LOSS) AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) —Comprehensive income (loss) 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. Our comprehensive income (loss) includes currency translation adjustments and changes in the funded status of pension benefit plans.

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives of Property, Plant and Equipment	Depreciation is calculated primarily on the straight-line method over the following estimated useful lives: Pipelines and related facilities 10 – 31 years Storage and terminal facilities 10 – 25 years Natural gas gathering and processing facilities 10 – 31 years Trucking equipment and other 3 – 7 years Office property and equipment 3 – 31 years

Rose Rock Midstream, L.P. (Tabl

Rose Rock Midstream, L.P. (Tables)	12 Months Ended
	Dec. 31, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Quarterly Target Distributions	Rose Rock’s partnership agreement requires Rose Rock to distribute all of its available cash each quarter in the following manner: Total Quarterly Distributions Per Unit Target Amount Marginal Percentage Interest in Distributions Unitholders General Partner Incentive Distribution Rights Minimum Quarterly Distributions $ 0.362500 98.0 % 2.0 % — First Target Distribution above $ 0.362500 up to $ 0.416875 98.0 % 2.0 % — Second Target Distribution above $ 0.416875 up to $ 0.453125 85.0 % 2.0 % 13.0 % Third Target Distribution above $ 0.453125 up to $ 0.543750 75.0 % 2.0 % 23.0 % Thereafter above $ 0.543750 50.0 % 2.0 % 48.0 %
Distributions Paid	The following table shows the distributions paid related to the earnings for each of the following periods (in thousands, except for per unit amounts): Distribution Per Unit Distributions Paid Quarter Ended SemGroup Noncontrolling Interest Common Units Total Distributions General Partner Incentive Distributions Common Units Subordinated Units December 31, 2012 $ 0.4025 $ 167 $ — $ 1,163 $ 3,377 $ 3,624 $ 8,331 March 31, 2013 $ 0.4300 $ 179 $ 41 $ 1,242 $ 3,607 $ 3,872 $ 8,941 June 30, 2013 $ 0.4400 $ 183 $ 72 $ 1,271 $ 3,692 $ 3,962 $ 9,180 September 30, 2013 $ 0.4500 $ 232 $ 127 $ 1,301 $ 3,775 $ 6,189 $ 11,624 December 31, 2013 $ 0.4650 $ 257 $ 244 $ 2,041 $ 3,901 $ 6,398 $ 12,841 March 31, 2014 $ 0.4950 $ 278 $ 488 $ 2,173 $ 4,153 $ 6,811 $ 13,903 June 30, 2014 $ 0.5350 $ 334 $ 888 $ 3,646 $ 4,488 $ 7,362 $ 16,718 September 30, 2014 $ 0.5750 $ 377 $ 1,835 $ 3,918 $ 4,824 $ 7,912 $ 18,866 December 31, 2014 $ 0.6200 $ 485 $ 3,487 $ 6,551 $ 5,202 $ 8,544 $ 24,269 March 31, 2015 $ 0.6350 $ 568 $ 4,450 $ 13,148 $ — $ 10,213 $ 28,379 June 30, 2015 $ 0.6500 $ 590 $ 4,979 $ 13,458 $ — $ 10,456 $ 29,483 September 30, 2015 $ 0.6600 $ 604 $ 5,333 $ 13,665 $ — $ 10,619 $ 30,221 December 31, 2015 $ 0.6600 (1) $ 604 $ 5,333 $ 13,665 $ — $ 10,622 $ 30,224 (1) The distribution to common unitholders related to earnings for the quarter ended December 31, 2015 was payable on February 12, 2016 to holders of record at February 2, 2016.
Summarized Balance Sheet Information	Certain summarized balance sheet information of Rose Rock is shown below (in thousands): December 31, 2015 2014 Cash $ 9,059 $ 3,625 Other current assets 310,555 271,144 Property, plant and equipment, net 441,596 396,066 Equity method investment 438,291 269,635 Goodwill 26,628 36,116 Other noncurrent assets 31,702 29,677 Total assets $ 1,257,831 $ 1,006,263 Current liabilities $ 283,029 $ 265,682 Long-term debt 744,597 432,092 Partners’ capital attributable to SemGroup 149,376 238,560 Partners’ capital attributable to noncontrolling interests 80,829 69,929 Total liabilities and partners’ capital $ 1,257,831 $ 1,006,263
Summarized Income Statement Information	Certain summarized income statement information of Rose Rock for the years ended December 31, 2015 , 2014 , and 2013 is shown below (in thousands): Year Ended December 31, 2015 2014 2013 Revenue $ 844,711 $ 1,298,097 $ 767,202 Costs of products sold $ 671,769 $ 1,131,362 $ 663,759 Operating, general and administrative expenses $ 114,476 $ 99,894 $ 51,624 Depreciation and amortization expense $ 41,998 $ 40,035 $ 23,708 Earnings from equity method investment $ 76,355 $ 57,378 $ 17,571 Net income $ 49,673 $ 62,925 $ 37,515 Noncontrolling interest in consolidated subsidiaries retained by SemGroup $ — $ 7,758 $ 1,256 Net income attributable to Rose Rock Midstream, L.P. $ 49,673 $ 55,167 $ 36,259

Equity Method Investments (Tabl

Equity Method Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Equity Method Investments [Table Text Block]	Our equity method investments consist of the following (in thousands): December 31, 2015 2014 White Cliffs $ 297,109 $ 269,635 NGL Energy 112,787 162,246 Glass Mountain 141,182 146,039 Total equity method investments $ 551,078 $ 577,920
Cash distributions received from equity method investments [Table Text Block]	Cash distributions received from equity method investments consist of the following (in thousands): Year Ended December 31, 2015 2014 2013 White Cliffs $ 86,845 $ 66,768 $ 57,576 NGL Energy 19,074 23,404 18,321 Glass Mountain 13,623 6,823 — Total cash distributions received from equity method investments $ 119,542 $ 96,995 $ 75,897
Earnings from Equity Method Investments [Table Text Block]	Our earnings from equity method investments consist of the following (in thousands): Year Ended December 31, 2015 2014 2013 White Cliffs $ 70,238 $ 57,378 $ 45,459 NGL Energy (1) 5,031 2,343 7,123 Glass Mountain 6,117 4,478 (105 ) Total earnings from equity method investments $ 81,386 $ 64,199 $ 52,477 (1) Excluding gains on issuance of common units of $6.4 million , $29.0 million and $26.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.
White Cliffs Pipeline, LLC [Member]
Schedule of Balance Sheet Information on Equity Method Investments	Certain summarized balance sheet information of White Cliffs is shown below (in thousands): December 31, 2015 2014 Current assets $ 54,091 $ 35,623 Property, plant and equipment, net 509,068 471,179 Goodwill 17,000 17,000 Other intangible assets, net 11,974 16,043 Total assets $ 592,133 $ 539,845 Current liabilities $ 9,491 $ 11,108 Members’ equity 582,642 528,737 Total liabilities and members’ equity $ 592,133 $ 539,845
Schedule of Income Statement Information on Equity Method Investments	Certain summarized income statement information of White Cliffs for the years ended December 31, 2015 , 2014 and 2013 is shown below (in thousands): Year Ended December 31, 2015 2014 2013 Revenue $ 206,395 $ 160,369 $ 133,310 Operating, general and administrative expenses $ 33,284 $ 23,067 $ 23,825 Depreciation and amortization expense $ 34,105 $ 23,257 $ 18,668 Net income $ 139,000 $ 114,045 $ 90,817
Ngl Energy Partners Lp [Member]
Schedule of Balance Sheet Information on Equity Method Investments	Certain unaudited summarized balance sheet information of NGL Energy is shown below (in thousands): (Unaudited) September 30, 2015 2014 Current assets $ 1,276,919 $ 2,585,053 Property plant and equipment, net 1,845,112 1,433,313 Goodwill 1,490,928 1,170,490 Intangible and other assets, net 1,836,878 1,362,823 Total assets $ 6,449,837 $ 6,551,679 Current liabilities $ 852,170 $ 1,759,980 Long-term debt 3,093,694 2,437,351 Other noncurrent liabilities 17,679 39,518 Equity 2,486,294 2,314,830 Total liabilities and equity $ 6,449,837 $ 6,551,679
Schedule of Income Statement Information on Equity Method Investments	Certain unaudited summarized income statement information of NGL Energy for the twelve months ended September 30, 2015, 2014 and 2013 is shown below (in thousands): (Unaudited) Twelve Months Ended September 30, 2015 2014 2013 Revenue $ 14,504,581 $ 15,748,520 $ 5,935,715 Costs of products sold $ 13,573,066 $ 15,054,291 $ 5,478,361 Operating, general and administrative expenses $ 625,035 $ 440,609 $ 276,905 Depreciation and amortization expense $ 221,067 $ 162,443 $ 94,050 Net income $ 22,995 $ 11,409 $ 44,378
Glass Mountain Pipeline LLC [Member]
Schedule of Balance Sheet Information on Equity Method Investments	Certain summarized balance sheet information of Glass Mountain is shown below (in thousands): December 31, 2015 2014 Current assets $ 7,856 $ 8,810 Property, plant and equipment, net 205,920 215,876 Total assets $ 213,776 $ 224,686 Current liabilities $ 1,036 $ 2,643 Other liabilities 28 42 Members’ equity 212,712 222,001 Total liabilities and members’ equity $ 213,776 $ 224,686
Schedule of Income Statement Information on Equity Method Investments	Certain summarized income statement information of Glass Mountain for the year ended December 31, 2015 and 2014 is shown below (in thousands): Year Ended December 31, 2015 2014 Revenue $ 38,526 $ 30,398 Cost of Sales $ 3,392 $ 757 Operating, general and administrative expenses $ 6,643 $ 6,419 Depreciation and amortization expense $ 15,828 $ 13,872 Net income $ 12,657 $ 9,344

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information	Year Ended December 31, 2015 2014 2013 Revenues: Crude Transportation External $ 81,991 $ 84,718 $ 34,917 Intersegment 15,021 10,840 225 Crude Facilities External 45,936 44,007 46,697 Crude Supply and Logistics External 716,784 1,169,372 685,588 SemGas External 231,569 342,286 207,134 Intersegment 20,605 37,897 23,985 SemCAMS External 136,197 176,724 198,450 SemLogistics External 24,351 12,650 11,671 SemMexico External 211,291 290,869 242,559 Corporate and Other External 6,975 1,953 — Intersegment (35,626 ) (48,737 ) (24,210 ) Total Revenues $ 1,455,094 $ 2,122,579 $ 1,427,016 Year Ended December 31, 2015 2014 2013 Earnings from equity method investments: Crude Transportation $ 76,355 $ 61,856 $ 45,354 SemStream (1) 11,416 31,363 33,996 Total earnings from equity method investments $ 87,771 $ 93,219 $ 79,350 (1) including gain on issuance of common units by equity method investee Year Ended December 31, 2015 2014 2013 Depreciation and amortization: Crude Transportation $ 35,500 $ 33,679 $ 17,814 Crude Facilities 5,829 5,365 4,833 Crude Supply and Logistics 159 549 673 SemGas 31,803 26,353 14,517 SemCAMS 12,940 14,295 10,766 SemLogistics 8,543 10,005 9,426 SemMexico 4,076 6,031 5,991 Corporate and Other 2,032 2,120 2,389 Total depreciation and amortization $ 100,882 $ 98,397 $ 66,409 Year Ended December 31, 2015 2014 2013 Income tax expense (benefit): SemCAMS $ 4,847 $ 3,135 $ 6,348 SemLogistics (2,195 ) (2,231 ) (5,699 ) SemMexico 2,611 4,053 2,589 Corporate and other 28,267 41,556 (20,492 ) Total income tax expense (benefit) $ 33,530 $ 46,513 $ (17,254 ) Year Ended December 31, 2015 2014 2013 Segment profit (1) : Crude Transportation $ 81,028 $ 76,705 $ 51,100 Crude Facilities 33,757 32,286 37,083 Crude Supply and Logistics 30,088 24,021 15,010 SemGas 61,669 41,715 32,483 SemCAMS 36,013 45,326 32,886 SemStream 11,391 31,280 33,389 SemLogistics 7,249 25 (2,007 ) SemMexico 15,614 16,139 13,493 Corporate and Other (44,760 ) (43,841 ) (30,088 ) Total segment profit $ 232,049 $ 223,656 $ 183,349 (1) Segment profit represents revenues excluding unrealized gains (losses) related to derivative instruments plus earnings from equity method investments less cost of sales excluding depreciation and amortization and less operating and general and administrative expenses. Year Ended December 31, 2015 2014 2013 Reconciliation of segment profit to net income: Total segment profit $ 232,049 $ 223,656 $ 183,349 Less: Net unrealized loss (gain) related to derivative instruments 2,014 (1,734 ) (974 ) Depreciation and amortization 100,882 98,397 66,409 Interest expense 69,675 49,044 25,142 Foreign currency transaction gain (1,067 ) (86 ) (1,633 ) Other expense (income), net (15,801 ) (20,536 ) 45,906 Income tax expense (benefit) 33,530 46,513 (17,254 ) Loss (income) from discontinued operations 4 1 (59 ) Net income $ 42,812 $ 52,057 $ 65,812 Year Ended December 31, 2015 2014 2013 Additions to long-lived assets, including acquisitions and contributions to equity method investments: Crude Transportation $ 219,227 $ 160,471 $ 244,777 Crude Facilities 30,118 8,207 11,783 Crude Supply and Logistics 2,564 11,662 1,868 SemGas 110,908 153,088 410,508 SemCAMS 142,368 35,286 56,122 SemLogistics 12,289 2,974 2,071 SemMexico 7,051 9,690 6,375 SemStream — — 18,775 Corporate and Other 1,919 1,906 1,211 Total additions to long-lived assets $ 526,444 $ 383,284 $ 753,490 December 31, 2015 2014 Total assets (excluding intersegment receivables): Crude Transportation $ 877,017 $ 746,723 Crude Facilities 155,186 116,784 Crude Supply and Logistics 328,419 271,444 SemGas 719,789 662,223 SemCAMS 331,749 279,191 SemLogistics 155,794 150,498 SemMexico 89,608 107,225 SemStream 112,787 162,246 Corporate and Other 100,947 93,468 Total $ 2,871,296 $ 2,589,802 December 31, 2015 2014 Equity investments: Crude Transportation $ 438,291 $ 415,674 SemStream 112,787 162,246 Total equity investments $ 551,078 $ 577,920

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Components Of Inventories	Inventories consist of the following (in thousands): December 31, 2015 2014 Crude oil $ 59,121 $ 26,722 Asphalt and other 11,118 16,810 Total inventories $ 70,239 $ 43,532

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Other Assets [Abstract]
Other current assets	Other current assets consist of the following (in thousands): December 31, 2015 2014 Prepaid expenses $ 6,252 $ 5,989 Deferred tax asset 2,321 5,897 Other 10,814 8,131 Total other current assets $ 19,387 $ 20,017
Other noncurrent assets	Other noncurrent assets consist of the following (in thousands): December 31, 2015 2014 Debt issuance costs, net (1) $ 23,728 $ 22,203 Deferred tax asset 34,848 13,933 Other 3,579 8,250 Total other noncurrent assets, net $ 62,155 $ 44,386 (1) See Note 15 for discussion of debt issuance costs.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule Of Property, Plant And Equipment	Property, plant and equipment consists of the following (in thousands): December 31, 2015 2014 Land $ 89,815 $ 81,886 Pipelines and related facilities 338,789 283,347 Storage and terminal facilities 283,608 284,300 Natural gas gathering and processing facilities 810,358 606,553 Linefill 26,900 26,050 Trucking equipment and other 43,157 40,392 Office property and equipment 45,818 37,120 Construction-in-progress 248,145 142,806 Property, plant and equipment, gross 1,886,590 1,502,454 Accumulated depreciation (319,769 ) (245,629 ) Property, plant and equipment, net $ 1,566,821 $ 1,256,825

Goodwill and Other Intangible41

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill And Other Intangible Assets [Abstract]
Goodwill by Segment	Goodwill relates to the following segments (in thousands): December 31, 2015 2014 Crude Transportation $ 26,628 $ 36,116 SemGas 13,052 13,052 SemMexico 8,352 9,158 Total Goodwill $ 48,032 $ 58,326
Reconciliation of Goodwill	Changes in goodwill balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands): Balance, December 31, 2012 $ 9,884 Barcas acquisition (Note 6) 28,322 MMGS acquisition (Note 6) 23,839 Currency translation adjustments (24 ) Balance, December 31, 2013 62,021 Crude oil trucking asset acquisition (Note 6) 7,892 MMGS purchase price allocation adjustment (10,787 ) Barcas purchase price allocation adjustment (98 ) Currency translation adjustments (702 ) Balance, December 31, 2014 58,326 Impairment loss (9,488 ) Currency translation adjustments (806 ) Balance, December 31, 2015 $ 48,032
Other Intangible Assets by Segment	The gross carrying amount and accumulated amortization of intangible assets are shown below (in thousands): December 31, 2015 December 31, 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Customer Relationships $ 188,304 $ (26,975 ) $ 161,329 $ 189,583 $ (17,963 ) $ 171,620 Trade Names 493 (378 ) 115 570 (379 ) 191 Unpatented Technology 2,941 (2,162 ) 779 3,457 (2,203 ) 1,254 Total other intangible assets $ 191,738 $ (29,515 ) $ 162,223 $ 193,610 $ (20,545 ) $ 173,065
Reconciliation of Other Intangible Assets	Changes in other intangible asset balances during the period from December 31, 2012 to December 31, 2015 are shown below (in thousands): Balance, December 31, 2012 $ 7,585 Amortization (6,018 ) Barcas acquisition 6,930 MMGS acquisition 166,332 Currency translation adjustments 9 Balance, December 31, 2013 174,838 Amortization (15,875 ) Crude oil trucking asset acquisition 17,010 MMGS purchase price allocation adjustment (2,313 ) Barcas purchase price allocation adjustment (50 ) Currency translation adjustments (545 ) Balance, December 31, 2014 173,065 Amortization (10,334 ) Currency translation adjustments (508 ) Balance, December 31, 2015 $ 162,223
Future Amortization of Other Intangible Assets	We estimate that future amortization of other intangible assets will be as follows (in thousands): For year ending: December 31, 2016 $ 10,928 December 31, 2017 11,011 December 31, 2018 10,918 December 31, 2019 10,316 December 31, 2020 9,649 Thereafter 109,401 Total estimated amortization expense $ 162,223

Financial Instruments and Con42

Financial Instruments and Concentrations of Risk (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	The table below summarizes the balances of commodity derivative assets and liabilities at December 31, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 Derivatives subject to netting arrangements: Level 1 Netting (1) Total Level 1 Netting (1) Total Commodity derivatives: Assets $ 131 $ (131 ) $ — $ 3,311 $ (1,637 ) $ 1,674 Liabilities $ 470 $ (131 ) $ 339 $ 1,637 $ (1,637 ) $ — (1) Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange.
Schedule of Notional Quantities for Commodity Derivative Instruments	The following table sets forth the notional quantities for derivative instruments entered into (in thousands of barrels): Year Ended December 31, 2015 2014 2013 Sales 23,228 6,773 2,595 Purchases 22,946 6,477 2,575
Schedule of Derivatives Not Designated as Hedging Instruments Fair Value on Condensed Consolidated Balance Sheets	We have recorded the fair value of our commodity derivative instruments on our consolidated balance sheets in "other current assets" and "other current liabilities" in the following amounts (in thousands): December 31, 2015 December 31, 2014 Other Current Assets Other Current Liabilities Other Current Assets Other Current Liabilities $ — $ 339 $ 1,674 $ —
Schedule of Realized and Unrealized Gains (Losses) 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 December 31, 2015 2014 2013 Realized and unrealized gain (loss) $ 8,146 $ 19,305 $ (1,593 )
Schedule of Foreign Assets and Liabilities	The following table summarizes the assets and liabilities (excluding affiliate balances) at December 31, 2015 of our subsidiaries outside the United States (in thousands): Canada United Kingdom Mexico Total Cash and cash equivalents $ 20,729 $ 8,014 $ 17,338 $ 46,081 Other current assets 47,267 3,413 31,616 82,296 Noncurrent assets 273,967 144,367 40,654 458,988 Total assets $ 341,963 $ 155,794 $ 89,608 $ 587,365 Current liabilities $ 40,541 $ 5,660 $ 15,868 $ 62,069 Noncurrent liabilities 47,971 15,633 1,167 64,771 Total liabilities 88,512 21,293 17,035 126,840 Net assets $ 253,451 $ 134,501 $ 72,573 $ 460,525

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Consolidated Income (Loss) From Continuing Operations	Our consolidated income from continuing operations before income taxes was generated in the following jurisdictions (in thousands): Year Ended December 31, 2015 2014 2013 U.S. $ 46,728 $ 39,231 $ 40,002 Foreign 29,618 59,340 8,497 Consolidated $ 76,346 $ 98,571 $ 48,499
Summary of Income Tax Expense (Benefit)	The following table summarizes income tax provision (benefit) from continuing operations by jurisdiction (in thousands): Year Ended December 31, 2015 2014 2013 Current income tax provision: Foreign $ 4,301 $ 10,430 $ 15,546 U.S. federal — (195 ) 2,067 U.S. state 32 132 1,435 4,333 10,367 19,048 Deferred income tax provision (benefit): Foreign 4,747 2,024 (10,222 ) U.S. federal 21,865 30,074 (23,756 ) U.S. state 2,585 4,048 (2,324 ) 29,197 36,146 (36,302 ) Provision (benefit) for income taxes $ 33,530 $ 46,513 $ (17,254 )
Reconciliation of Income Tax Provision (Benefit)	The following table reconciles income tax provision at the U.S. federal statutory rate to the consolidated provision (benefit) for income taxes (in thousands): Year Ended December 31, 2015 2014 2013 Income from continuing operations before income taxes $ 76,346 $ 98,571 $ 48,499 U.S. federal statutory rate 35 % 35 % 35 % Provision at statutory rate 26,721 34,500 16,975 State income taxes—net of federal benefit 1,701 3,197 (577 ) Effect of rates other than statutory (2,306 ) (1,925 ) (1,041 ) Effect of U.S. taxation on foreign branches 10,366 20,769 2,974 Foreign tax adjustment, prior years 7 (3,669 ) 4,533 Warrants — 4,698 24,625 Noncontrolling interest (4,373 ) (7,986 ) (6,096 ) Foreign tax credit and offset to branch deferreds (1,740 ) 6,851 (2,876 ) Impact of valuation allowance on deferred tax assets 1,740 (7,331 ) (53,218 ) Foreign net gain on subsidiary dissolution and debt waivers — (13,620 ) — Foreign withholding taxes 6 5,054 — Other, net 1,408 5,975 (2,553 ) Provision (benefit) for income taxes $ 33,530 $ 46,513 $ (17,254 )
Significant Components of Deferred Tax Assets and Liabilities	Significant components of deferred tax assets and liabilities are as follows at December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Deferred tax assets: Net operating loss and other credit carryforwards $ 55,100 $ 38,835 Compensation and benefits 8,178 10,736 Inventories 213 280 Intangible assets 35,152 43,977 Pension plan 4,643 3,733 Allowance for doubtful accounts 1,552 1,860 Deferred revenue 4,619 7,622 Foreign tax credit and offset to branch deferreds 104,026 102,286 Other 41,318 17,786 less: valuation allowance (104,509 ) (102,769 ) Net deferred tax assets 150,292 124,346 Deferred tax liabilities: Intangible assets (4,638 ) (5,770 ) Prepaid expenses (142 ) (163 ) Property, plant and equipment (219,247 ) (178,505 ) Equity investment in partnerships (85,385 ) (78,813 ) Other (4,107 ) (2,549 ) Total deferred tax liabilities (313,519 ) (265,800 ) Net deferred tax liabilities $ (163,227 ) $ (141,454 )

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Instrument [Line Items]
Summary of Long-Term Debt	Our long-term debt consisted of the following (in thousands): December 31, 2015 2014 SemGroup 7.50% senior unsecured notes due 2021 $ 300,000 $ 300,000 SemGroup corporate revolving credit facility 30,000 35,000 Rose Rock 5.625% senior unsecured notes due 2022 400,000 400,000 Rose Rock 5.625% senior unsecured notes due 2023, net of discount 344,545 — Rose Rock credit facility — 32,000 SemMexico credit facility — — Capital leases 83 132 Total long-term debt 1,074,628 767,132 less: current portion of long-term debt 31 40 Noncurrent portion of long-term debt $ 1,074,597 $ 767,092
Scheduled Principal Payments of Debt	The following table summarizes the scheduled principal payments as of December 31, 2015 (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. SemGroup Notes Rose Rock 2022 Notes Rose Rock 2023 Notes SemGroup Facility Rose Rock Facility SemMexico Facility Capital Leases Total For the year ended: December 31, 2016 $ — $ — $ — $ — $ — $ — $ 31 $ 31 December 31, 2017 — — — — — — 26 26 December 31, 2018 — — — 30,000 — — 26 30,026 December 31, 2019 — — — — — — — — December 31, 2020 — — — — — — — — Thereafter 300,000 400,000 350,000 — — — — 1,050,000 Total $ 300,000 $ 400,000 $ 350,000 $ 30,000 $ — $ — $ 83 $ 1,080,083
Senior Notes [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Early Redemption Premium Percentages [Table Text Block]	From and after June 15, 2016, the Company may redeem the SemGroup 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 June 15 of each of the years indicated below: SemGroup 2021 senior unsecured notes 2016 105.625% 2017 103.750% 2018 101.875% 2019 and thereafter 100.000%
Rose Rock Midstream L P [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Early Redemption Premium Percentages [Table Text Block]	From and after July 15, 2017, in the case of the Rose Rock 2022 Notes, or May 15, 2019, in the case of the Rose Rock 2023 Notes, Rose Rock may redeem the Rose Rock 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 for the Rose Rock 2022 Notes or May 15 for the Rose Rock 2023 Notes of each of the years indicated below for the respective Notes: Rose Rock 2022 senior unsecured notes 2017 104.219% 2018 102.813% 2019 101.406% 2020 and thereafter 100.000% Rose Rock 2023 senior unsecured notes 2019 102.813% 2020 101.406% 2021 and thereafter 100.000%

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Long-term Purchase Commitment [Line Items]
Summary of Changes in Asset Retirement Obligations	The following table summarizes the changes in this liability from December 31, 2012 through December 31, 2015 (in thousands): Balance, December 31, 2012 $ 40,105 Accretion 4,752 Payments made (808 ) Currency translation adjustments (2,864 ) Balance, December 31, 2013 41,185 Accretion 4,807 Payments made (514 ) Currency translation adjustments (3,524 ) Balance, December 31, 2014 41,954 Accretion 4,748 Payments made (511 ) Revaluation (26,000 ) Currency translation adjustments (4,245 ) Balance, December 31, 2015 $ 15,946
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Future minimum payments required under operating leases that have initial or remaining non-cancellable lease terms in excess of one year at December 31, 2015 are as follows (in thousands): For year ending: December 31, 2016 $ 9,218 December 31, 2017 7,001 December 31, 2018 3,055 December 31, 2019 1,941 December 31, 2020 157 Thereafter 6,814 Total future minimum lease payments $ 28,186
Summary of Purchase and Sale Commitments [Table Text Block]	At December 31, 2015 , such commitments included the following (in thousands): Volume (barrels) Value Fixed price purchases 1,976 $ 71,709 Fixed price sales 2,907 $ 116,329 Floating price purchases 17,361 $ 652,122 Floating price sales 19,691 $ 709,991
Long-term Purchase Commitment [Table Text Block]	The approximate amount of future obligation is as follows (in thousands): For year ending: December 31, 2016 $ 11,804 December 31, 2017 11,938 December 31, 2018 10,060 December 31, 2019 9,121 December 31, 2020 8,451 Thereafter 15,941 Total expected future payments $ 67,315

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Schedule of common stock reflected on the consolidated balance sheet	The par value of common stock reflected on the consolidated balance sheet at December 31, 2015 is summarized below: Class A Class B Shares accounted for at December 31, 2012 41,971,050 28,235 Issuance of shares under employee and director compensation programs (1) 107,988 — Shares issued upon exercise of warrants 425,618 — Shares accounted for at December 31, 2013 42,504,656 28,235 Conversion of Class B shares 28,235 (28,235 ) Issuance of shares under employee and director compensation programs (1) 169,933 — Shares issued under employee stock purchase plan 6,999 — Shares issued upon exercise of warrants 904,231 — Shares accounted for at December 31, 2014 43,614,054 — Issuance of shares under employee and director compensation programs (1) 184,803 — Shares issued under employee stock purchase plan 24,882 — Shares accounted for at December 31, 2015 (2) 43,823,739 — (1) Of these vested shares, recipients sold back to the Company 62,291 , 11,120 and 8,591 shares during the years ended December 31, 2015 , 2014 and 2013, respectively, to satisfy tax withholding obligations. These repurchased shares are being recognized at cost as treasury stock on the consolidated balance sheet. (2) In addition to the shares in the table above, there are shares of unvested restricted stock outstanding at December 31, 2015 . The par value of these shares has not yet been reflected in common stock on the consolidated balance sheet, as these shares have not yet vested. There are also shares of restricted stock that were returned to treasury upon forfeiture. The par value of these shares is not reflected in the consolidated balance sheet, as no accounting recognition is given to forfeited shares. Certain unvested restricted stock is considered legally issued and outstanding and is included in the number of shares presented on the consolidated balance sheets.
Dividends Declared [Table Text Block]	The following table sets forth the quarterly dividends per share declared and paid to shareholders for the periods indicated: Quarter Ending Dividend Per Share Date Declared Date of Record Date Paid June 30, 2013 $ 0.19 May 8, 2013 May 20, 2013 May 30, 2013 September 30, 2013 $ 0.20 August 8, 2013 August 19, 2013 August 30, 2013 December 31, 2013 $ 0.21 November 11, 2013 November 22, 2013 December 3, 2013 March 31, 2014 $ 0.22 February 25, 2014 March 10, 2014 March 20, 2014 June 30, 2014 $ 0.24 May 8, 2014 May 19, 2014 May 29, 2014 September 30, 2014 $ 0.27 August 6, 2014 August 18, 2014 August 28, 2014 December 31, 2014 $ 0.30 November 6, 2014 November 17, 2014 November 28, 2014 March 31, 2015 $ 0.34 February 26, 2015 March 9, 2015 March 20, 2015 June 30, 2015 $ 0.38 May 6, 2015 May 18, 2015 May 29, 2015 September 30, 2015 $ 0.42 August 4, 2015 August 17, 2015 August 25, 2015 December 31, 2015 $ 0.45 November 3, 2015 November 16, 2015 November 24, 2015 March 31, 2016 $ 0.45 February 24, 2016 March 7, 2016 March 17, 2016

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]	The following summarizes the calculation of basic earnings per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 Continuing Operations Discontinued Operations Net Income $ 42,816 $ (4 ) $ 42,812 less: Income attributable to noncontrolling interest 12,492 — 12,492 Income attributable to SemGroup $ 30,324 $ (4 ) $ 30,320 Weighted average common stock outstanding 43,787 43,787 43,787 Basic earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2014 Continuing Operations Discontinued Operations Net Income $ 52,058 $ (1 ) $ 52,057 less: Income attributable to noncontrolling interest 22,817 — 22,817 Income attributable to SemGroup $ 29,241 $ (1 ) $ 29,240 Weighted average common stock outstanding 42,665 42,665 42,665 Basic earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2013 Continuing Operations Discontinued Operations Net Income $ 65,753 $ 59 $ 65,812 less: Income attributable to noncontrolling interest 17,710 — 17,710 Income attributable to SemGroup $ 48,043 $ 59 $ 48,102 Weighted average common stock outstanding 42,339 42,339 42,339 Basic earnings per share $ 1.13 $ 0.00 $ 1.14
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]	The following summarizes the calculation of diluted earnings per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 Continuing Operations Discontinued Operations Net Income $ 42,816 $ (4 ) $ 42,812 less: Income attributable to noncontrolling interest 12,492 — 12,492 Income attributable to SemGroup $ 30,324 $ (4 ) $ 30,320 Weighted average common stock outstanding 43,787 43,787 43,787 Effect of dilutive securities 183 183 183 Diluted weighted average common stock outstanding 43,970 43,970 43,970 Diluted earnings per share $ 0.69 $ 0.00 $ 0.69 Year Ended December 31, 2014 Continuing Operations Discontinued Operations Net Income $ 52,058 $ (1 ) $ 52,057 less: Income attributable to noncontrolling interest 22,817 — 22,817 Income attributable to SemGroup $ 29,241 $ (1 ) $ 29,240 Weighted average common stock outstanding 42,665 42,665 42,665 Effect of dilutive securities 302 302 302 Diluted weighted average common stock outstanding 42,967 42,967 42,967 Diluted earnings per share $ 0.68 $ 0.00 $ 0.68 Year Ended December 31, 2013 Continuing Operations Discontinued Operations Net Income $ 65,753 $ 59 $ 65,812 less: Income attributable to noncontrolling interest 17,710 — 17,710 Income attributable to SemGroup $ 48,043 $ 59 $ 48,102 Weighted average common stock outstanding 42,339 42,339 42,339 Effect of dilutive securities 307 307 307 Diluted weighted average common stock outstanding 42,646 42,646 42,646 Diluted earnings per share $ 1.13 $ 0.00 $ 1.13

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of unvested share activity	The activity related to these awards during the period from December 31, 2012 to December 31, 2015 is summarized below: Unvested Shares Average Grant Date Fair Value Aggregate Fair Value of Shares (in thousands) Outstanding at December 31, 2012 450,552 $ 26.87 Awards granted - 2013 201,451 $ 52.78 Awards vested - 2013 (107,988 ) $ 25.71 $ 2,776 Awards forfeited - 2013 (13,412 ) $ 32.36 Outstanding at December 31, 2013 530,603 $ 36.80 Awards granted - 2014 207,786 $ 77.14 Awards vested - 2014 (169,340 ) $ 33.07 $ 5,600 Awards forfeited - 2014 (119,130 ) $ 42.16 Outstanding at December 31, 2014 449,919 $ 70.69 Awards granted - 2015 151,789 $ 77.93 Awards vested - 2015 (181,906 ) $ 35.18 $ 6,399 Awards forfeited - 2015 (8,494 ) $ 42.05 Outstanding at December 31, 2015 411,308 $ 75.25
Schedule of Share-based Payment Award Valuation Assumptions [Table Text Block]	The following table sets forth the assumptions used in the valuations of these awards granted in 2015, 2014 and 2013: 2015 2014 2013 Volatility 26.8% 29.3% 28.9% Risk-free interest rate 1.06% 0.66% 0.35%
Rose Rock equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of unvested share activity	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, 2012 43,960 $ 21.91 Awards granted - 2013 49,104 $ 34.41 Awards vested - 2013 (9,333 ) $ 27.25 $ 254 Awards forfeited - 2013 (783 ) $ 34.40 Outstanding at December 31, 2013 82,948 $ 28.59 Awards granted - 2014 46,536 $ 41.35 Awards vested - 2014 (5,712 ) $ 35.87 $ 205 Awards forfeited - 2014 (21,432 ) $ 29.82 Outstanding at December 31, 2014 102,340 $ 33.79 Awards granted - 2015 36,527 $ 39.03 Awards vested - 2015 (38,366 ) $ 27.54 $ 1,057 Awards forfeited - 2015 (310 ) $ 42.80 Outstanding at December 31, 2015 100,191 $ 38.70

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Weighted Average Discount Rate [Line Items]
Projected benefit obligations and plan assets of the pension plans	The table below summarizes the balances of the projected benefit obligation and fair value of the plan assets at December 31, 2015 and 2014 (in thousands): December 31, 2015 2014 Projected benefit obligation $ 23,865 $ 29,266 Fair value of plan assets 22,204 26,368 Funded status: $ (1,661 ) $ (2,898 )

Accumulated Other Comprehensi50

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of accumulated other comprehensive income (loss)	The following table presents changes in the components of accumulated other comprehensive income (loss) (in thousands): Currency Translation Employee Benefit Plans Total Balance, December 31, 2012 $ 1,855 $ (3,154 ) $ (1,299 ) Currency translation adjustment, net of income tax benefit of $3,993 (6,363 ) — (6,363 ) Changes related to benefit plans, net of income tax expense of $1,603 — 4,808 4,808 Balance, December 31, 2013 (4,508 ) 1,654 (2,854 ) Currency translation adjustment, net of income tax benefit of $11,102 (20,551 ) — (20,551 ) Changes related to benefit plans, net of income tax benefit of $1,245 — (3,736 ) (3,736 ) Balance, December 31, 2014 (25,059 ) (2,082 ) (27,141 ) Currency translation adjustment, net of income tax benefit of $19,593 (32,142 ) — (32,142 ) Changes related to benefit plans, net of income tax expense of $240 — 721 721 Balance, December 31, 2015 $ (57,201 ) $ (1,361 ) $ (58,562 )

Supplemental Cash Flow Inform51

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Schedule of Changes in Operating Assets and Liabilities	The following table summarizes the changes in the components of operating assets and liabilities, net of the effects of acquisitions (in thousands): Year Ended December 31, 2015 2014 2013 Decrease (increase) in restricted cash $ 6,764 $ (2,045 ) $ 29,467 Decrease (increase) in accounts receivable 9,051 (32,602 ) 11,172 Decrease (increase) in receivable from affiliates 10,905 50,454 (61,095 ) Decrease (increase) in inventories (31,043 ) (6,243 ) (11,352 ) Decrease (increase) in derivatives and margin deposits (2,109 ) 28 1,012 Decrease (increase) in other current assets (413 ) (614 ) 9,361 Decrease (increase) in other assets 4,015 2 137 Increase (decrease) in accounts payable and accrued liabilities 2,513 11,461 31,030 Increase (decrease) in payable to affiliates (8,427 ) (48,819 ) 62,279 Increase (decrease) in payables to pre-petition creditors (3,837 ) (54 ) (29,609 ) Increase (decrease) in other noncurrent liabilities (2,625 ) 5,067 (2,541 ) $ (15,206 ) $ (23,365 ) $ 39,861

Quarterly Financial Data (Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Summarized Information on the Consolidated Results of Operations	Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2015 is shown below (in thousands, except per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter Total Total revenues $ 298,310 $ 377,226 $ 397,065 $ 382,493 $ 1,455,094 Loss (gain) on disposal or impairment, net 1,058 1,372 (951 ) 9,993 11,472 Other operating costs and expenses 301,206 352,549 376,973 371,512 1,402,240 Total expenses 302,264 353,921 376,022 381,505 1,413,712 Earnings from equity method investments 20,559 23,903 16,237 20,687 81,386 Gain on issuance of common units by equity method investee — 5,897 136 352 6,385 Operating income 16,605 53,105 37,416 22,027 129,153 Other expenses, net 6,087 9,809 17,829 19,082 52,807 Income from continuing operations before income taxes 10,518 43,296 19,587 2,945 76,346 Income tax expense 4,742 14,861 10,006 3,921 33,530 Income from continuing operations 5,776 28,435 9,581 (976 ) 42,816 Loss from discontinued operations, net of income taxes — (2 ) (1 ) (1 ) (4 ) Net income 5,776 28,433 9,580 (977 ) 42,812 Less: net income (loss) attributable to noncontrolling interests 4,310 5,136 4,707 (1,661 ) 12,492 Net income attributable to SemGroup $ 1,466 $ 23,297 $ 4,873 $ 684 $ 30,320 Earnings per share—basic $ 0.03 $ 0.53 $ 0.11 $ 0.02 $ 0.69 Earnings per share—diluted $ 0.03 $ 0.53 $ 0.11 $ 0.02 $ 0.69 Summarized information on our consolidated results of operations for the quarters during the year ended December 31, 2014 is shown below (in thousands, except per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter Total Total revenues $ 498,883 $ 482,224 $ 594,235 $ 547,237 $ 2,122,579 Loss (gain) on disposal or impairment, net (58 ) 19,315 1,376 11,959 32,592 Other operating costs and expenses 478,264 471,863 575,936 530,150 2,056,213 Total expenses 478,206 491,178 577,312 542,109 2,088,805 Earnings from equity method investments 14,962 19,187 14,223 15,827 64,199 Gain on issuance of common units by equity method investee 8,127 — 18,772 2,121 29,020 Operating income 43,766 10,233 49,918 23,076 126,993 Other expenses (income), net 7,497 29,489 (6,368 ) (2,196 ) 28,422 Income (loss) from continuing operations before income taxes 36,269 (19,256 ) 56,286 25,272 98,571 Income tax expense (benefit) 16,526 (6,672 ) 24,090 12,569 46,513 Income (loss) from continuing operations 19,743 (12,584 ) 32,196 12,703 52,058 Income (loss) from discontinued operations, net of income taxes (5 ) — — 4 (1 ) Net income (loss) 19,738 (12,584 ) 32,196 12,707 52,057 Less: net income attributable to noncontrolling interests 6,150 5,025 6,934 4,633 22,817 Net income (loss) attributable to SemGroup $ 13,588 $ (17,609 ) $ 25,262 $ 8,074 $ 29,240 Earnings (loss) per share—basic $ 0.32 $ (0.41 ) $ 0.59 $ 0.19 $ 0.69 Earnings (loss) per share—diluted $ 0.29 $ (0.41 ) $ 0.59 $ 0.18 $ 0.68

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	During the years ended December 31, 2015 , 2014 and 2013 , we generated the following transactions with NGL Energy and its subsidiaries (in thousands): Year Ended December 31, 2015 2014 2013 Revenues $ 157,732 $ 456,987 $ 796,440 Purchases $ 138,095 $ 437,015 $ 669,450 Reimbursements from NGL Energy for services $ 56 $ 168 $ 198

Condensed Consolidating Guara54

Condensed Consolidating Guarantor Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Condensed Balance Sheet [Table Text Block]	Condensed Consolidating Guarantor Balance Sheets December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 4,559 $ — $ 55,101 $ (1,564 ) $ 58,096 Restricted cash — — 32 — 32 Accounts receivable 640 20,015 306,058 — 326,713 Receivable from affiliates 1,616 1,119 6,141 (2,962 ) 5,914 Inventories — (48 ) 70,287 — 70,239 Other current assets 8,477 359 10,551 — 19,387 Total current assets 15,292 21,445 448,170 (4,526 ) 480,381 Property, plant and equipment 4,335 536,628 1,025,858 — 1,566,821 Equity method investments 1,546,853 426,801 438,291 (1,860,867 ) 551,078 Goodwill — 13,052 34,980 — 48,032 Other intangible assets 20 144,183 18,020 — 162,223 Other noncurrent assets, net 43,898 881 17,376 — 62,155 Total assets $ 1,610,398 $ 1,142,990 $ 1,982,695 $ (1,865,393 ) $ 2,870,690 LIABILITIES AND OWNERS’ EQUITY Current liabilities: Accounts payable $ 734 $ 11,221 $ 261,711 $ — $ 273,666 Payable to affiliates 78 155 7,762 (2,962 ) 5,033 Accrued liabilities 5,551 10,957 68,534 5 85,047 Deferred revenue — — 11,349 — 11,349 Other current liabilities 569 — 1,332 — 1,901 Current portion of long-term debt — — 31 — 31 Total current liabilities 6,932 22,333 350,719 (2,957 ) 377,027 Long-term debt 330,000 7,340 761,097 (23,840 ) 1,074,597 Deferred income taxes 155,411 — 45,542 — 200,953 Other noncurrent liabilities 2,528 — 19,229 — 21,757 Commitments and contingencies Owners’ equity excluding noncontrolling interests in consolidated subsidiaries 1,115,527 1,113,317 725,279 (1,838,596 ) 1,115,527 Noncontrolling interests in consolidated subsidiaries — — 80,829 — 80,829 Total owners’ equity 1,115,527 1,113,317 806,108 (1,838,596 ) 1,196,356 Total liabilities and owners’ equity $ 1,610,398 $ 1,142,990 $ 1,982,695 $ (1,865,393 ) $ 2,870,690 December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 9,254 $ — $ 35,445 $ (4,101 ) $ 40,598 Restricted cash 3,856 — 3,124 — 6,980 Accounts receivable 9,669 32,056 309,609 — 351,334 Receivable from affiliates 2,512 6,624 15,659 (7,976 ) 16,819 Inventories — 248 43,284 — 43,532 Other current assets 10,498 575 8,944 — 20,017 Total current assets 35,789 39,503 416,065 (12,077 ) 479,280 Property, plant and equipment 4,112 452,352 800,361 — 1,256,825 Equity method investments 1,551,825 348,115 415,673 (1,737,693 ) 577,920 Goodwill — 13,052 45,274 — 58,326 Other intangible assets 26 152,383 20,656 — 173,065 Other noncurrent assets, net 24,555 958 18,873 — 44,386 Total assets $ 1,616,307 $ 1,006,363 $ 1,716,902 $ (1,749,770 ) $ 2,589,802 LIABILITIES AND OWNERS’ EQUITY Current liabilities: Accounts payable $ 649 $ 22,097 $ 234,431 $ — $ 257,177 Payable to affiliates 21 7 21,406 (7,974 ) 13,460 Accrued liabilities 11,993 17,575 63,126 — 92,694 Payables to pre-petition creditors 3,129 — — — 3,129 Deferred revenue — — 23,688 — 23,688 Other current liabilities 224 707 543 — 1,474 Current portion of long-term debt — — 40 — 40 Total current liabilities 16,016 40,386 343,234 (7,974 ) 391,662 Long-term debt 335,000 — 490,946 (58,854 ) 767,092 Deferred income taxes 112,897 — 49,059 — 161,956 Other noncurrent liabilities 2,886 — 46,769 — 49,655 Commitments and contingencies Owners’ equity excluding noncontrolling interests in consolidated subsidiaries 1,149,508 965,977 716,965 (1,682,942 ) 1,149,508 Noncontrolling interests in consolidated subsidiaries — — 69,929 — 69,929 Total owners’ equity 1,149,508 965,977 786,894 (1,682,942 ) 1,219,437 Total liabilities and owners’ equity $ 1,616,307 $ 1,006,363 $ 1,716,902 $ (1,749,770 ) $ 2,589,802
Condensed Income Statement [Table Text Block]	Condensed Consolidating Guarantor Statements of Operations Year Ended December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 190,900 $ 948,576 $ (20,590 ) $ 1,118,886 Service — 58,690 200,852 — 259,542 Other — — 76,666 — 76,666 Total revenues — 249,590 1,226,094 (20,590 ) 1,455,094 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 142,576 857,563 (20,590 ) 979,549 Operating — 34,407 190,036 — 224,443 General and administrative 29,914 9,935 57,517 — 97,366 Depreciation and amortization 1,522 31,395 67,965 — 100,882 Loss on disposal or impairment, net — 142 11,330 — 11,472 Total expenses 31,436 218,455 1,184,411 (20,590 ) 1,413,712 Earnings from equity method investments 65,513 47,352 76,355 (107,834 ) 81,386 Gain on issuance of common units by equity method investee 6,385 — — — 6,385 Operating income 40,462 78,487 118,038 (107,834 ) 129,153 Other expenses (income): Interest expense 2,230 26,476 42,926 (1,957 ) 69,675 Foreign currency transaction gain (5 ) — (1,062 ) — (1,067 ) Other income, net (16,565 ) — (1,193 ) 1,957 (15,801 ) Total other expenses (income), net (14,340 ) 26,476 40,671 — 52,807 Income from continuing operations before income taxes 54,802 52,011 77,367 (107,834 ) 76,346 Income tax expense 24,482 — 9,048 — 33,530 Income from continuing operations 30,320 52,011 68,319 (107,834 ) 42,816 Loss from discontinued operations, net of income taxes — (3 ) (1 ) — (4 ) Net income 30,320 52,008 68,318 (107,834 ) 42,812 Less: net income attributable to noncontrolling interests — — 12,492 — 12,492 Net income attributable to SemGroup $ 30,320 $ 52,008 $ 55,826 $ (107,834 ) $ 30,320 Net income $ 30,320 $ 52,008 $ 68,318 $ (107,834 ) $ 42,812 Other comprehensive income (loss), net of income taxes 17,420 430 (49,271 ) — (31,421 ) Comprehensive income 47,740 52,438 19,047 (107,834 ) 11,391 Less: comprehensive income attributable to noncontrolling interests — — 12,492 — 12,492 Comprehensive income (loss) attributable to SemGroup $ 47,740 $ 52,438 $ 6,555 $ (107,834 ) $ (1,101 ) Year Ended December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 338,621 $ 1,479,543 $ (37,850 ) $ 1,780,314 Service — 37,139 196,100 — 233,239 Other — — 109,026 — 109,026 Total revenues — 375,760 1,784,669 (37,850 ) 2,122,579 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 273,309 1,387,899 (37,850 ) 1,623,358 Operating — 32,132 214,481 — 246,613 General and administrative 22,394 9,328 56,123 — 87,845 Depreciation and amortization 1,678 25,714 71,005 — 98,397 Loss (gain) on disposal or impairment, net 5,945 54,698 (28,051 ) — 32,592 Total expenses 30,017 395,181 1,701,457 (37,850 ) 2,088,805 Earnings from equity method investments 48,760 71,786 54,098 (110,445 ) 64,199 Gain on issuance of common units by equity method investee 29,020 — — — 29,020 Operating income 47,763 52,365 137,310 (110,445 ) 126,993 Other expenses (income): Interest expense 8,423 9,265 34,661 (3,305 ) 49,044 Foreign currency transaction gain — — (86 ) — (86 ) Other expenses (income), net (24,092 ) 500 (249 ) 3,305 (20,536 ) Total other expenses (income), net (15,669 ) 9,765 34,326 — 28,422 Income from continuing operations before income taxes 63,432 42,600 102,984 (110,445 ) 98,571 Income tax expense 34,192 — 12,321 — 46,513 Income from continuing operations 29,240 42,600 90,663 (110,445 ) 52,058 Loss from discontinued operations, net of income taxes — — (1 ) — (1 ) Net income 29,240 42,600 90,662 (110,445 ) 52,057 Less: net income attributable to noncontrolling interests — — 22,817 — 22,817 Net income attributable to SemGroup $ 29,240 $ 42,600 $ 67,845 $ (110,445 ) $ 29,240 Net income $ 29,240 $ 42,600 $ 90,662 $ (110,445 ) $ 52,057 Other comprehensive income (loss), net of income taxes 5,159 — (29,446 ) — (24,287 ) Comprehensive income 34,399 42,600 61,216 (110,445 ) 27,770 Less: comprehensive income attributable to noncontrolling interests — — 22,817 — 22,817 Comprehensive income attributable to SemGroup $ 34,399 $ 42,600 $ 38,399 $ (110,445 ) $ 4,953 Year Ended December 31, 2013 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Revenues: Product $ — $ 224,072 $ 944,984 $ (23,952 ) $ 1,145,104 Service — 3,192 137,006 — 140,198 Other — — 141,714 — 141,714 Total revenues — 227,264 1,223,704 (23,952 ) 1,427,016 Expenses: Costs of products sold, exclusive of depreciation and amortization shown below — 166,735 877,317 (23,952 ) 1,020,100 Operating — 19,792 203,793 — 223,585 General and administrative 21,560 9,167 47,870 — 78,597 Depreciation and amortization 2,001 13,909 50,499 — 66,409 Loss (gain) on disposal or impairment, net — 668 (907 ) — (239 ) Total expenses 23,561 210,271 1,178,572 (23,952 ) 1,388,452 Earnings from equity method investments 67,965 49,825 44,099 (109,412 ) 52,477 Gain on issuance of common units by equity method investee 26,873 — — — 26,873 Operating income 71,277 66,818 89,231 (109,412 ) 117,914 Other expenses (income): Interest expense 4,826 9,700 16,028 (5,412 ) 25,142 Foreign currency transaction gain — — (1,633 ) — (1,633 ) Other expense (income), net 40,928 — (434 ) 5,412 45,906 Total other expenses, net 45,754 9,700 13,961 — 69,415 Income from continuing operations before income taxes 25,523 57,118 75,270 (109,412 ) 48,499 Income tax expense (benefit) (22,579 ) — 5,325 — (17,254 ) Income from continuing operations 48,102 57,118 69,945 (109,412 ) 65,753 Income (loss) from discontinued operations, net of income taxes — 65 (6 ) — 59 Net income 48,102 57,183 69,939 (109,412 ) 65,812 Less: net income attributable to noncontrolling interests — — 17,710 — 17,710 Net income attributable to SemGroup $ 48,102 $ 57,183 $ 52,229 $ (109,412 ) $ 48,102 Net income $ 48,102 $ 57,183 $ 69,939 $ (109,412 ) $ 65,812 Other comprehensive loss, net of income taxes (1,517 ) — (38 ) — (1,555 ) Comprehensive income 46,585 57,183 69,901 (109,412 ) 64,257 Less: comprehensive income attributable to noncontrolling interests — — 17,710 — 17,710 Comprehensive income attributable to SemGroup $ 46,585 $ 57,183 $ 52,191 $ (109,412 ) $ 46,547
Condensed Cash Flow Statement [Table Text Block]	Condensed Consolidating Guarantor Statements of Cash Flows Year Ended December 31, 2015 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 37,259 $ 39,786 $ 141,899 $ (37,182 ) $ 181,762 Cash flows from investing activities: Capital expenditures (1,740 ) (110,729 ) (367,061 ) — (479,530 ) Proceeds from sale of long-lived assets — 35 3,653 — 3,688 Contributions to equity method investments — — (46,730 ) — (46,730 ) Proceeds from sale of common units of equity method investee 56,318 — — — 56,318 Proceeds from the sale of Wattenberg Holding, LLC and Glass mountain Holding, LLC to Rose Rock Midstream L.P. 251,181 — — (251,181 ) — Distributions in excess of equity in earnings of affiliates 35,340 — 24,113 (35,340 ) 24,113 Net cash provided by (used in) investing activities 341,099 (110,694 ) (386,025 ) (286,521 ) (442,141 ) Cash flows from financing activities: Debt issuance costs (601 ) — (5,688 ) — (6,289 ) Borrowings on credit facilities and issuance of senior unsecured notes 181,000 — 686,208 — 867,208 Principal payments on credit facilities and other obligations (186,000 ) — (374,049 ) — (560,049 ) Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs — — 89,119 — 89,119 Distributions to noncontrolling interests — — (40,410 ) — (40,410 ) Repurchase of common stock for payment of statutory taxes due on equity-based compensation (4,261 ) — — — (4,261 ) Dividends paid (69,514 ) — — — (69,514 ) Proceeds from issuance of common stock under employee stock purchase plan 1,223 — — — 1,223 Intercompany borrowings (advances), net (304,900 ) 70,908 (92,248 ) 326,240 — Net cash provided by (used in) financing activities (383,053 ) 70,908 262,932 326,240 277,027 Effect of exchange rate changes on cash and cash equivalents — — 850 — 850 Change in cash and cash equivalents (4,695 ) — 19,656 2,537 17,498 Cash and cash equivalents at beginning of period 9,254 — 35,445 (4,101 ) 40,598 Cash and cash equivalents at end of period $ 4,559 $ — $ 55,101 $ (1,564 ) $ 58,096 Year Ended December 31, 2014 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 27,393 $ 57,976 $ 186,578 $ (90,289 ) $ 181,658 Cash flows from investing activities: Capital expenditures (1,672 ) (155,392 ) (113,442 ) — (270,506 ) Proceeds from sale of long-lived assets — 2,368 2,077 — 4,445 Contributions to equity method investments — — (71,131 ) — (71,131 ) Payments to acquire businesses — (514 ) (43,994 ) — (44,508 ) Proceeds from sale of common units of equity method investee 79,741 — — — 79,741 Proceeds from the sale of interest in SemCrude Pipeline, L.L.C. to Rose Rock Midstream, L.P. 114,412 — — (114,412 ) — Distributions in excess of equity in earnings of affiliates 1,843 — 11,734 (1,843 ) 11,734 Net cash provided by (used in) investing activities 194,324 (153,538 ) (214,756 ) (116,255 ) (290,225 ) Cash flows from financing activities: Debt issuance costs (93 ) — (8,593 ) — (8,686 ) Borrowings on debt 405,500 — 848,744 — 1,254,244 Principal payments on debt and other obligations (440,500 ) — (661,772 ) — (1,102,272 ) Distributions to noncontrolling interests — — (28,494 ) — (28,494 ) Proceeds from warrant exercises 1,451 — — — 1,451 Repurchase of common stock (719 ) — — — (719 ) Dividends paid (44,206 ) — — — (44,206 ) Proceeds from issuance of common stock under employee stock purchase plan 340 — — — 340 Excess tax benefit from equity-based awards 1,650 — — — 1,650 Intercompany borrowings (advances), net (138,431 ) 95,562 (161,110 ) 203,979 — Net cash provided by (used in) financing activities (215,008 ) 95,562 (11,225 ) 203,979 73,308 Effect of exchange rate changes on cash and cash equivalents — — (3,494 ) — (3,494 ) Change in cash and cash equivalents 6,709 — (42,897 ) (2,565 ) (38,753 ) Cash and cash equivalents at beginning of period 2,545 — 78,342 (1,536 ) 79,351 Cash and cash equivalents at end of period $ 9,254 $ — $ 35,445 $ (4,101 ) $ 40,598 Year Ended December 31, 2013 Parent Guarantors Non-guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 20,130 $ 23,230 $ 150,284 $ (20,235 ) $ 173,409 Cash flows from investing activities: Capital expenditures (734 ) (96,909 ) (117,966 ) — (215,609 ) Proceeds from sale of long-lived assets 23 19 1,237 — 1,279 Contributions to equity method investments (18,775 ) — (155,093 ) — (173,868 ) Payments to acquire businesses — (313,487 ) (48,969 ) — (362,456 ) Proceeds from the sale of SemStream assets 362,600 — — (362,600 ) — Distributions in excess of equity in earnings of affiliates — — 12,246 — 12,246 Net cash provided by (used in) investing activities 343,114 (410,377 ) (308,545 ) (362,600 ) (738,408 ) Cash flows from financing activities: Debt issuance costs (10,866 ) — (4,070 ) — (14,936 ) Borrowings on credit facilities 706,000 — 562,474 — 1,268,474 Principal payments on credit facilities and other obligations (537,500 ) — (321,912 ) — (859,412 ) Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs — — 210,226 — 210,226 Distributions to noncontrolling interests — — (17,647 ) — (17,647 ) Proceeds from warrant exercises 225 — — — 225 Repurchase of common stock (371 ) — — — (371 ) Dividends paid (25,429 ) — — — (25,429 ) Intercompany borrowings (advances), net (511,881 ) 387,147 (259,503 ) 384,237 — Net cash provided by (used in) financing activities (379,822 ) 387,147 169,568 384,237 561,130 Effect of exchange rate changes on cash and cash equivalents — — 3,191 — 3,191 Change in cash and cash equivalents (16,578 ) — 14,498 1,402 (678 ) Cash and cash equivalents at beginning of period 19,123 — 63,844 (2,938 ) 80,029 Cash and cash equivalents at end of period $ 2,545 $ — $ 78,342 $ (1,536 ) $ 79,351

Overview (Details)

Overview (Details)	12 Months Ended
	Dec. 31, 2015PipelinesinmisharesbblMMcf	Sep. 30, 2015
Crude Transportation [Member]
Schedule Of Overview [Line Items]
Trucks	270
Trailers	270
Crude Transportation [Member] | Wattenberg Oil Trunkline LLC [Member]
Schedule Of Overview [Line Items]
Length of pipeline network (in miles) | mi	75
Oil storage capacity, barrels	360,000
Width of Pipeline | in	12
Pipeline capacity	85,000
Crude Transportation [Member] | Maurepas Pipeline [Member]
Schedule Of Overview [Line Items]
Number of pipelines | Pipelines	3
SemGas [Member]
Schedule Of Overview [Line Items]
Gas processing plants	4
Gas plant operating capacity | MMcf	595
SemCAMS [Member]
Schedule Of Overview [Line Items]
Gas processing plants	4
Gas plant operating capacity | MMcf	695
SemLogistics [Member]
Schedule Of Overview [Line Items]
Oil storage capacity, barrels	8,700,000
SemMexico [Member]
Schedule Of Overview [Line Items]
Asphalt cement terminals and modification facilities	11
Marine terminals	2
White Cliffs Pipeline, LLC [Member]
Schedule Of Overview [Line Items]
Width of Pipeline | in	12
Equity method investment, ownership percentage	51.00%
White Cliffs Pipeline, LLC [Member] | Crude Transportation [Member]
Schedule Of Overview [Line Items]
Length of pipeline network (in miles) | mi	527
Width of Pipeline | in	12
Number of pipelines | Pipelines	2
Equity method investment, ownership percentage	51.00%
Glass Mountain Pipeline LLC [Member] | Crude Transportation [Member]
Schedule Of Overview [Line Items]
Length of pipeline network (in miles) | mi	210
Equity method investment, ownership percentage	50.00%
Ngl Energy Partners Lp [Member] | General Partner [Member] | SemStream [Member]
Schedule Of Overview [Line Items]
Equity method investment, ownership percentage	11.78%
Partnership Interest [Member] | Glass Mountain Pipeline LLC [Member]
Schedule Of Overview [Line Items]
Equity method investment, ownership percentage	50.00%
Partnership Interest [Member] | Ngl Energy Partners Lp [Member] | Limited Partner [Member] | SemStream [Member]
Schedule Of Overview [Line Items]
Equity method investment, ownership percentage	4.40%	4.40%
Investments in and Advances to Affiliates, Balance, Shares | shares	4,652,568
Kansas and Oklahoma [Member] | Crude Transportation [Member]
Schedule Of Overview [Line Items]
Length of pipeline network (in miles) | mi	570
Oil storage capacity, barrels	650,000
COLORADO | Crude Transportation [Member] | Wattenberg Oil Trunkline LLC [Member]
Schedule Of Overview [Line Items]
Length of pipeline network (in miles) | mi	16
COLORADO | Crude Facilities [Member]
Schedule Of Overview [Line Items]
Oil storage capacity, barrels	350,000
Number of Lanes in Crude Oil Truck Unloading Facility	30
OKLAHOMA | Crude Facilities [Member]
Schedule Of Overview [Line Items]
Oil storage capacity, barrels	7,600,000
Crude oil storage capacity leased to customers	6,500,000
Crude oil storage capacity used for operations	1,100,000
NORTH DAKOTA | Crude Supply and Logistics [Member]
Schedule Of Overview [Line Items]
Oil storage capacity, barrels	61,800

Consolidation And Basis Of Pr56

Consolidation And Basis Of Presentation (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Consolidation And Basis Of Presentation [Line Items]
Property, plant and equipment	$ 1,566,821,000	$ 1,256,825,000
SemCAMS [Member] | Proportionally Consolidated Assets [Member]
Consolidation And Basis Of Presentation [Line Items]
Property, plant and equipment	$ 273,000,000
White Cliffs Pipeline, LLC [Member]
Consolidation And Basis Of Presentation [Line Items]
Equity method investment, ownership percentage	51.00%
White Cliffs Pipeline, LLC [Member] | Semcrude Pipeline [Member]
Consolidation And Basis Of Presentation [Line Items]
Equity method investment, ownership percentage	51.00%
White Cliffs Pipeline, LLC [Member] | Crude Transportation [Member]
Consolidation And Basis Of Presentation [Line Items]
Equity method investment, ownership percentage	51.00%
Glass Mountain Pipeline LLC [Member] | Crude Transportation [Member]
Consolidation And Basis Of Presentation [Line Items]
Equity method investment, ownership percentage	50.00%
Wattenberg Oil Trunkline and Glass Mountain Pipeline [Member] | Common control transaction [Member] | Rose Rock Midstream L P [Member]
Consolidation And Basis Of Presentation [Line Items]
Gain (loss) on disposal, excluding discontinued operations	$ 0
Semcrude Pipeline [Member] | Common control transaction [Member] | Rose Rock Midstream L P [Member]
Consolidation And Basis Of Presentation [Line Items]
Gain (loss) on disposal, excluding discontinued operations		$ 0

Summary of Significant Accoun57

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015
Pipelines and related facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Pipelines and related facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years
Storage and terminal facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Storage and terminal facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	25 years
Natural gas gathering and processing facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Natural gas gathering and processing facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years
Trucking equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	3 years
Trucking equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	7 years
Office and Other Property and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	3 years
Office and Other Property and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years

Summary of Significant Accoun58

Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Country	Dec. 31, 2014USD ($)
Summary Of Significant Accounting Policies [Line Items]
Payables to pre-petition creditors	$ 0	$ 3,129
Restricted cash	$ 32	6,980
Number of countries in which segments operate | Country	4
Restricted Cash For Settlement Purposes [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		3,800
SemCAMS [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage mark-up on pass-through of recoverable maintenance costs	10.00%
Minimum [Member] | SemCAMS [Member]
Summary Of Significant Accounting Policies [Line Items]
Maintenance period	4 years
Maximum [Member] | SemCAMS [Member]
Summary Of Significant Accounting Policies [Line Items]
Maintenance period	5 years
Other Current Liabilities [Member] | Discontinued Operations [Member]
Summary Of Significant Accounting Policies [Line Items]
Payables to pre-petition creditors		$ 700

Rose Rock Midstream, L.P. (Deta

Rose Rock Midstream, L.P. (Details 1) - Rose Rock Midstream L P [Member]	12 Months Ended
	Dec. 31, 2015$ / Unit
Minimum Quarterly Distributions [Member]
Quarterly Target Distributions
Marginal Percentage Interest, Unitholders	98.00%
Marginal Percentage Interest, General Partner	2.00%
Marginal Percentage Interest, Incentive Distribution Rights	0.00%
Minimum Quarterly Distributions [Member] | Minimum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.3625
First Target Distribution [Member]
Quarterly Target Distributions
Marginal Percentage Interest, Unitholders	98.00%
Marginal Percentage Interest, General Partner	2.00%
Marginal Percentage Interest, Incentive Distribution Rights	0.00%
First Target Distribution [Member] | Minimum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.3625
First Target Distribution [Member] | Maximum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.416875
Second Target Distribution [Member]
Quarterly Target Distributions
Marginal Percentage Interest, Unitholders	85.00%
Marginal Percentage Interest, General Partner	2.00%
Marginal Percentage Interest, Incentive Distribution Rights	13.00%
Second Target Distribution [Member] | Minimum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.416875
Second Target Distribution [Member] | Maximum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.453125
Third Target Distribution [Member]
Quarterly Target Distributions
Marginal Percentage Interest, Unitholders	75.00%
Marginal Percentage Interest, General Partner	2.00%
Marginal Percentage Interest, Incentive Distribution Rights	23.00%
Third Target Distribution [Member] | Minimum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.453125
Third Target Distribution [Member] | Maximum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.54375
Thereafter [Member]
Quarterly Target Distributions
Marginal Percentage Interest, Unitholders	50.00%
Marginal Percentage Interest, General Partner	2.00%
Marginal Percentage Interest, Incentive Distribution Rights	48.00%
Thereafter [Member] | Minimum [Member]
Quarterly Target Distributions
Partners' minimum quarterly distribution per unit	0.54375

Rose Rock Midstream, L.P. (De60

Rose Rock Midstream, L.P. (Details 2) - Rose Rock Midstream L P [Member] - USD ($) $ / shares in Units, $ in Thousands

Feb. 12, 2016

Nov. 13, 2015

Aug. 14, 2015

May. 15, 2015

Feb. 13, 2015

Nov. 14, 2014

Aug. 14, 2014

May. 15, 2014

Nov. 14, 2013

Aug. 14, 2013

May. 15, 2013

Feb. 14, 2014

Feb. 14, 2013

Distribution of Q4 2012 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4025

Total distributions

$ 8,331

Distribution of Q1 2013 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4300

Total distributions

$ 8,941

Distribution of Q2 2013 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4400

Total distributions

$ 9,180

Distribution of Q3 2013 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4500

Total distributions

$ 11,624

Distribution of Q4 2013 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4650

Total distributions

$ 12,841

Distribution of Q1 2014 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.4950

Total distributions

$ 13,903

Distribution of Q2 2014 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.5350

Total distributions

$ 16,718

Distribution of Q3 2014 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.5750

Total distributions

$ 18,866

Distribution of Q4 2014 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.6200

Total distributions

$ 24,269

Distribution of Q1 2015 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.6350

Total distributions

$ 28,379

Distribution of Q2 2015 earnings [Member]

Distributions Paid

Distribution per unit

$ 0.6500

Total distributions

$ 29,483

Distribution of Q3 2015 Earnings [Member]

Distributions Paid

Distribution per unit

$ 0.6600

Total distributions

$ 30,221

Subsequent Event [Member] | Distribution of Q4 2015 Earnings [Member]

Distributions Paid

Distribution per unit

[1]

$ 0.6600

Total distributions

$ 30,224

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q4 2012 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

3,624

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q1 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

3,872

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q2 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

3,962

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q3 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

6,189

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q4 2013 earnings [Member]

Distributions Paid

Limited partner distributions

6,398

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q1 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

6,811

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q2 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

7,362

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q3 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

7,912

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q4 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

8,544

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q1 2015 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

10,213

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q2 2015 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

10,456

Limited Partner [Member] | Noncontrolling Interest [Member] | Distribution of Q3 2015 Earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

10,619

Limited Partner [Member] | Noncontrolling Interest [Member] | Subsequent Event [Member] | Distribution of Q4 2015 Earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

10,622

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2012 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

1,163

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2012 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

3,377

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

1,242

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2013 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

3,607

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

1,271

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2013 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

3,692

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

1,301

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2013 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

3,775

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2013 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

2,041

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2013 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

3,901

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

2,173

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2014 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

4,153

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

3,646

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2014 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

4,488

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

3,918

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2014 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

4,824

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2014 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

6,551

Limited Partner [Member] | Parent [Member] | Distribution of Q4 2014 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

5,202

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2015 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

13,148

Limited Partner [Member] | Parent [Member] | Distribution of Q1 2015 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

0

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2015 earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

13,458

Limited Partner [Member] | Parent [Member] | Distribution of Q2 2015 earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

0

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2015 Earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

13,665

Limited Partner [Member] | Parent [Member] | Distribution of Q3 2015 Earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

0

Limited Partner [Member] | Parent [Member] | Subsequent Event [Member] | Distribution of Q4 2015 Earnings [Member] | Common Unit [Member]

Distributions Paid

Limited partner distributions

13,665

Limited Partner [Member] | Parent [Member] | Subsequent Event [Member] | Distribution of Q4 2015 Earnings [Member] | Subordinated Units [Member]

Distributions Paid

Limited partner distributions

0

General Partner [Member] | Parent [Member] | Distribution of Q4 2012 earnings [Member]

Distributions Paid

General partner distributions

167

Incentive distributions

$ 0

General Partner [Member] | Parent [Member] | Distribution of Q1 2013 earnings [Member]

Distributions Paid

General partner distributions

179

Incentive distributions

$ 41

General Partner [Member] | Parent [Member] | Distribution of Q2 2013 earnings [Member]

Distributions Paid

General partner distributions

183

Incentive distributions

$ 72

General Partner [Member] | Parent [Member] | Distribution of Q3 2013 earnings [Member]

Distributions Paid

General partner distributions

232

Incentive distributions

$ 127

General Partner [Member] | Parent [Member] | Distribution of Q4 2013 earnings [Member]

Distributions Paid

General partner distributions

257

Incentive distributions

$ 244

General Partner [Member] | Parent [Member] | Distribution of Q1 2014 earnings [Member]

Distributions Paid

General partner distributions

278

Incentive distributions

$ 488

General Partner [Member] | Parent [Member] | Distribution of Q2 2014 earnings [Member]

Distributions Paid

General partner distributions

334

Incentive distributions

$ 888

General Partner [Member] | Parent [Member] | Distribution of Q3 2014 earnings [Member]

Distributions Paid

General partner distributions

377

Incentive distributions

$ 1,835

General Partner [Member] | Parent [Member] | Distribution of Q4 2014 earnings [Member]

Distributions Paid

General partner distributions

485

Incentive distributions

$ 3,487

General Partner [Member] | Parent [Member] | Distribution of Q1 2015 earnings [Member]

Distributions Paid

General partner distributions

568

Incentive distributions

$ 4,450

General Partner [Member] | Parent [Member] | Distribution of Q2 2015 earnings [Member]

Distributions Paid

General partner distributions

590

Incentive distributions

$ 4,979

General Partner [Member] | Parent [Member] | Distribution of Q3 2015 Earnings [Member]

Distributions Paid

General partner distributions

604

Incentive distributions

$ 5,333

General Partner [Member] | Parent [Member] | Subsequent Event [Member] | Distribution of Q4 2015 Earnings [Member]

Distributions Paid

General partner distributions

604

Incentive distributions

$ 5,333

[1]

(1) The distribution to common unitholders related to earnings for the quarter ended December 31, 2015 was payable on February 12, 2016 to holders of record at February 2, 2016.

Rose Rock Midstream, L.P. (De61

Rose Rock Midstream, L.P. (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summarized Balance Sheet Information
Other current assets	$ 19,387	$ 20,017
Property, plant and equipment	1,566,821	1,256,825
Equity method investments	551,078	577,920
Goodwill	48,032	58,326	$ 62,021	$ 9,884
Other noncurrent assets	62,155	44,386
Total assets	2,870,690	2,589,802
Current liabilities	377,027	391,662
Long-term debt	1,074,597	767,092
Total liabilities and owners’ equity	2,870,690	2,589,802
Rose Rock Midstream L P [Member]
Summarized Balance Sheet Information
Cash	9,059	3,625
Other current assets	310,555	271,144
Property, plant and equipment	441,596	396,066
Equity method investments	438,291	269,635
Goodwill	26,628	36,116
Other noncurrent assets	31,702	29,677
Total assets	1,257,831	1,006,263
Current liabilities	283,029	265,682
Long-term debt	744,597	432,092
Partners’ capital attributable to SemGroup	149,376	238,560
Partners’ capital attributable to noncontrolling interests	80,829	69,929
Total liabilities and owners’ equity	$ 1,257,831	$ 1,006,263

Rose Rock Midstream, L.P. (De62

Rose Rock Midstream, L.P. (Details 4) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summarized Income Statement Information
Revenue	$ 382,493	$ 397,065	$ 377,226	$ 298,310	$ 547,237	$ 594,235	$ 482,224	$ 498,883	$ 1,455,094	$ 2,122,579	$ 1,427,016
Costs of products sold									979,549	1,623,358	1,020,100
Depreciation and amortization expense									100,882	98,397	66,409
Earnings from equity method investments	20,687	16,237	23,903	20,559	15,827	14,223	19,187	14,962	81,386	64,199	52,477
Net income (loss)	(977)	9,580	28,433	5,776	12,707	32,196	(12,584)	19,738	42,812	52,057	65,812
Less: net income attributable to noncontrolling interests	(1,661)	4,707	5,136	4,310	4,633	6,934	5,025	6,150	12,492	22,817	17,710
Net Income (Loss) Attributable to Parent	$ 684	$ 4,873	$ 23,297	$ 1,466	$ 8,074	$ 25,262	$ (17,609)	$ 13,588	30,320	29,240	48,102
Rose Rock Midstream L P [Member]
Summarized Income Statement Information
Revenue									844,711	1,298,097	767,202
Costs of products sold									671,769	1,131,362	663,759
Operating, general and administrative expenses									114,476	99,894	51,624
Depreciation and amortization expense									41,998	40,035	23,708
Earnings from equity method investments									76,355	57,378	17,571
Net income (loss)									49,673	62,925	37,515
Less: net income attributable to noncontrolling interests									0	7,758	1,256
Net Income (Loss) Attributable to Parent									$ 49,673	$ 55,167	$ 36,259

Rose Rock Midstream, L.P. (De63

Rose Rock Midstream, L.P. (Details Textual)	Feb. 17, 2015shares	Feb. 13, 2015USD ($)shares	Jan. 02, 2015shares	Jan. 11, 2013USD ($)shares	Jun. 23, 2014USD ($)shares	Dec. 16, 2013USD ($)shares	Aug. 31, 2013USD ($)	Aug. 30, 2013shares	Dec. 31, 2015USD ($)$ / Unitsharesbbl	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Proceeds from Sale of Equity Method Investments									$ 56,318,000	$ 79,741,000	$ 0
Sale of interest in equity investment to related party									(20,772,000)	(31,930,000)	(67,291,000)
Tax effect of adjustment to APIC from sale of equity investment to less than wholly owned subsidiary									20,800,000	31,930,000	67,291,000
Tax effect of adjustment to APIC from sale of assets to less than wholly owned subsidiary									$ 20,800,000
Rose Rock Midstream L P [Member]
General partner ownership interest									2.00%
Limited partner ownership interest									55.10%
Proceeds from lines of credit				$ 133,500,000
Semcrude Pipeline [Member]
Gain on sale of interests in SemCrude Pipeline										0	0
Common Units [Member] | Rose Rock Midstream L P [Member]
Common units representing limited partner interests | shares									20,704,418
Limited Partners' Capital Account, Units Issued | shares		2,300,000						4,750,000
Subordinated Units [Member] | Rose Rock Midstream L P [Member]
Limited partners' capital account, units converted to common | shares	8,389,709
Class A [Member] | Rose Rock Midstream L P [Member]
Limited partners' capital account, units converted to common | shares			3,750,000
Private Placement [Member] | Common Units [Member] | Rose Rock Midstream L P [Member]
Common units sold in public offering | shares				2,000,000
Proceeds from issuance of common stock				$ 59,300,000
Glass Mountain Pipeline Llc [Member] | Partnership Interest [Member]
Equity method investment, ownership percentage									50.00%
White Cliffs Pipeline, LLC [Member]
Equity method investment, ownership percentage									51.00%
Average daily throughput threshold in barrels for conversion of Class A units | bbl									125,000
White Cliffs Pipeline, LLC [Member] | Semcrude Pipeline [Member]
Equity method investment, ownership percentage									51.00%
General Partner [Member] | Rose Rock Midstream L P [Member]
General partner ownership interest									2.00%
Common Units [Member] | Rose Rock Midstream L P [Member]
Proceeds from Issuance of Common Limited Partners Units		$ 89,100,000					$ 152,500,000
Noncontrolling Interest [Member]
Sale of interest in equity investment to related party									$ (51,452,000)	(85,173,000)	(180,220,000)
Transfer of entities in common control transaction									51,500,000
Additional Paid-in Capital [Member]
Sale of interest in equity investment to related party									30,680,000	53,243,000	112,929,000
Transfer of entities in common control transaction									$ (30,700,000)
Contribution of WOT and 50% interest in Glass Mountain [Member] | Rose Rock Midstream L P [Member]
Cash paid by subsidiary for acquisition in common control transaction		$ 251,200,000
Contribution of WOT and 50% interest in Glass Mountain [Member] | Rose Rock Midstream L P [Member] | Common Units [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares		1,750,000
Third contribution of 33% Interest in SemCrude Pipeline [Domain] | Semcrude Pipeline [Member]
Equity method investment, ownership percentage					33.00%
Third contribution of 33% Interest in SemCrude Pipeline [Domain] | Rose Rock Midstream L P [Member] | Common Units [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares					2,425,000
Third contribution of 33% Interest in SemCrude Pipeline [Domain] | Rose Rock Midstream L P [Member] | Class A [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares					1,250,000
Third contribution of 33% Interest in SemCrude Pipeline [Domain] | Rose Rock Midstream L P [Member] | Semcrude Pipeline [Member]
Proceeds from Sale of Equity Method Investments					$ 114,400,000
Initial contribution of 33% Interest in SemCrude Pipeline [Member] [Member] | Semcrude Pipeline [Member]
Equity method investment, ownership percentage				33.00%
Initial contribution of 33% Interest in SemCrude Pipeline [Member] [Member] | Rose Rock Midstream L P [Member] | Common Units [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares				1,500,000
Initial contribution of 33% Interest in SemCrude Pipeline [Member] [Member] | Rose Rock Midstream L P [Member] | Class A [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares				1,250,000
Initial contribution of 33% Interest in SemCrude Pipeline [Member] [Member] | Rose Rock Midstream L P [Member] | Semcrude Pipeline [Member]
Proceeds from Sale of Equity Method Investments				$ 189,500,000
Second contribution of 33% Interest in SemCrude Pipeline [Member] | Semcrude Pipeline [Member]
Equity method investment, ownership percentage						33.00%
Second contribution of 33% Interest in SemCrude Pipeline [Member] | Rose Rock Midstream L P [Member] | Common Units [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares						1,500,000
Second contribution of 33% Interest in SemCrude Pipeline [Member] | Rose Rock Midstream L P [Member] | Class A [Member]
Noncash or Part Noncash Divestiture, Amount of Consideration Received | shares						1,250,000
Second contribution of 33% Interest in SemCrude Pipeline [Member] | Rose Rock Midstream L P [Member] | Semcrude Pipeline [Member]
Proceeds from Sale of Equity Method Investments						$ 173,100,000
SemCrude Pipeline Acquisition Transactions [Member]
Transaction costs expensed										900,000	2,200,000
SemCrude Pipeline Acquisition Transactions [Member] | Rose Rock Midstream L P [Member]
Transaction costs expensed										$ 400,000	900,000
Equity issuance costs paid from proceeds											1,600,000
SemCrude Pipeline Acquisition Transactions [Member] | Revolving Credit Facility [Member] | Rose Rock Midstream L P [Member]
Deferred borrowing costs											$ 1,600,000
Minimum [Member] | First Target Distribution [Member] | Rose Rock Midstream L P [Member]
Partners' minimum quarterly distribution per unit | $ / Unit									0.3625
Crude Transportation [Member] | Glass Mountain Pipeline Llc [Member]
Equity method investment, ownership percentage									50.00%
Crude Transportation [Member] | White Cliffs Pipeline, LLC [Member]
Equity method investment, ownership percentage									51.00%
Crude Transportation [Member] | Limited Partner [Member] | Semcrude Pipeline [Member] | Rose Rock Midstream L P [Member]
Limited partner ownership interest									100.00%

Equity Method Investments (Inve

Equity Method Investments (Investment Summary) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Gain on issuance of common units by equity method investee		$ 352	$ 136	$ 5,897	$ 0	$ 2,121	$ 18,772	$ 0	$ 8,127	$ 6,385	$ 29,020	$ 26,873
Equity method investments		551,078				577,920				551,078	577,920
Earnings from equity method investments		20,687	$ 16,237	$ 23,903	$ 20,559	15,827	$ 14,223	$ 19,187	$ 14,962	81,386	64,199	52,477
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital										119,542	96,995	75,897
White Cliffs Pipeline, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		297,109				269,635				297,109	269,635
Earnings from equity method investments										70,238	57,378	45,459
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital										86,845	66,768	57,576
Ngl Energy Partners Lp [Member]
Schedule of Equity Method Investments [Line Items]
Gain on issuance of common units by equity method investee										6,400	29,000	26,900
Equity method investments		112,787				162,246				112,787	162,246
Earnings from equity method investments	[1]									5,031	2,343	7,123
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital										19,074	23,404	18,321
Glass Mountain Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 141,182				$ 146,039				141,182	146,039
Earnings from equity method investments										6,117	4,478	(105)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of and Return on Capital										$ 13,623	$ 6,823	$ 0
[1]	(1) Excluding gains on issuance of common units of $6.4 million, $29.0 million and $26.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Equity Method Invesments (Summa

Equity Method Invesments (Summarized Balance Sheet Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
White Cliffs Pipeline, LLC [Member]
Current assets	$ 54,091		$ 35,623
Property, plant and equipment, net	509,068		471,179
Goodwill	17,000		17,000
Other intangible assets, net	11,974		16,043
Total assets	592,133		539,845
Current liabilities	9,491		11,108
Members’ equity	582,642		528,737
Total liabilities and members’ equity	592,133		539,845
Glass Mountain Pipeline LLC [Member]
Current assets	7,856		8,810
Property, plant and equipment, net	205,920		215,876
Total assets	213,776		224,686
Current liabilities	1,036		2,643
Other liabilities	28		42
Members’ equity	212,712		222,001
Total liabilities and members’ equity	$ 213,776		$ 224,686
Ngl Energy Partners Lp [Member]
Current assets		$ 1,276,919		$ 2,585,053
Property, plant and equipment, net		1,845,112		1,433,313
Goodwill		1,490,928		1,170,490
Other intangible assets, net		1,836,878		1,362,823
Total assets		6,449,837		6,551,679
Current liabilities		852,170		1,759,980
Long-term debt		3,093,694		2,437,351
Other noncurrent liabilities		17,679		39,518
Members’ equity		2,486,294		2,314,830
Total liabilities and members’ equity		$ 6,449,837		$ 6,551,679

Equity Method Investments (Summ

Equity Method Investments (Summarized Income Statement Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
White Cliffs Pipeline, LLC [Member]
Summarized income statement information
Revenue	$ 206,395		$ 160,369		$ 133,310
Operating, general and administrative expenses	33,284		23,067		23,825
Depreciation and amortization expense	34,105		23,257		18,668
Net income	139,000		114,045		$ 90,817
Glass Mountain Pipeline LLC [Member]
Summarized income statement information
Revenue	38,526		30,398
Costs of products sold	3,392		757
Operating, general and administrative expenses	6,643		6,419
Depreciation and amortization expense	15,828		13,872
Net income	$ 12,657		$ 9,344
Ngl Energy Partners Lp [Member]
Summarized income statement information
Revenue		$ 14,504,581		$ 15,748,520		$ 5,935,715
Costs of products sold		13,573,066		15,054,291		5,478,361
Operating, general and administrative expenses		625,035		440,609		276,905
Depreciation and amortization expense		221,067		162,443		94,050
Net income		$ 22,995		$ 11,409		$ 44,378

Equity Method Investments (Deta

Equity Method Investments (Details Textual) $ / shares in Units, bbl in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)$ / sharessharesbbl	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)bblin$ / sharesshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)	Oct. 27, 2014
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Gain on issuance of common units by equity method investee	$ 352	$ 136	$ 5,897	$ 0	$ 2,121	$ 18,772	$ 0	$ 8,127	$ 6,385	$ 29,020	$ 26,873
General and administrative expenses									97,366	87,845	78,597
Proceeds from Sale of Equity Method Investments									56,318	79,741	0
Equity Method Investment, Realized Gain (Loss) on Disposal									14,517	34,211	0
White Cliffs Pipeline, LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
General and administrative expenses									$ 1,300	1,600	1,800
White Cliffs Pipeline, LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Percentage of ownership interest	51.00%								51.00%
Width of Pipeline | in									12
Partners' Capital Account, Contributions									$ 42,800
Ngl Energy Partners Lp [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Gain on issuance of common units by equity method investee									$ 6,400	$ 29,000	26,900
Share price | $ / shares	$ 11.04								$ 11.04
Units of equity investee divested | shares									1,999,533	2,481,308
Proceeds from Sale of Equity Method Investments										$ 88,800
Proceeds from Sale of Equity Method Investments									$ 56,300	79,700
Ngl Energy Partners Lp [Member] | NGL Energy Holdings LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Number of Seats on the Board of Directors												2
Glass Mountain Pipeline LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Partners' Capital Account, Contributions									2,700	16,200	57,800
Equity Method Goodwill	$ 31,000								31,000
Accumulated Capitalized Interest Costs	$ 4,000								$ 4,000
Partnership Interest [Member] | Glass Mountain Pipeline LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Percentage of ownership interest	50.00%								50.00%
Limited Partner [Member] | Partnership Interest [Member] | Ngl Energy Partners Lp [Member] | SemStream [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Percentage of ownership interest	4.40%	4.40%							4.40%
Investments in and Advances to Affiliates, Balance, Shares | shares	4,652,568								4,652,568
General Partner [Member] | Ngl Energy Partners Lp [Member] | SemStream [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Percentage of ownership interest	11.78%								11.78%
Pipeline expansion [Member] | White Cliffs Pipeline, LLC [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Incremental capacity expected to be added | bbl									65
Expected capital contributions, year one									$ 2,300
Pipeline capacity | bbl	150								150
Partners' Capital Account, Contributions									$ 34,500	53,300	$ 95,500
Other Operating Income (Expense) [Member] | Ngl Energy Partners Lp [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Transaction related costs									500
Equity Method Investment, Realized Gain (Loss) on Disposal									14,500
Other Nonoperating Income (Expense) [Member] | Ngl Energy Partners Lp [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Transaction related costs										3,100
Equity Method Investment, Realized Gain (Loss) on Disposal										$ 34,200
Fair Value, Inputs, Level 1 [Member] | Ngl Energy Partners Lp [Member]
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Equity Method Investment, Quoted Market Value	$ 51,400								$ 51,400

Acquisitions (Details Textual)

Acquisitions (Details Textual) a in Thousands, $ in Thousands	Jun. 25, 2014USD ($)	Sep. 02, 2013USD ($)TrucksTrailers	Aug. 01, 2013USD ($)amiMMcf	Dec. 31, 2015USD ($)	Jun. 23, 2014TrucksTrailers	Aug. 06, 2013
Business Acquisition [Line Items]
Senior notes				$ 300,000
Senior Notes [Member]
Business Acquisition [Line Items]
Debt instrument, interest rate stated percentage				7.50%
Crude Transportation [Member] | Chesapeake crude oil trucking assets [Member]
Business Acquisition [Line Items]
Payments to acquire businesses	$ 44,000
Trucks purchased | Trucks					124
Trailers purchased | Trailers					122
Crude Transportation [Member] | Barcas Field Services, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire businesses		$ 48,969
Trucks purchased | Trucks		114
Trailers purchased | Trailers		120
SemGas [Member] | Mid-America Midstream Gas Services, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire businesses			$ 314,001
Transaction costs expensed			$ 3,600
Length of gathering pipeline acquired | mi			200
Net acre dedication acquired | a			540
SemGas [Member] | Rose Valley I plant [Member] | Mid-America Midstream Gas Services, LLC [Member]
Business Acquisition [Line Items]
Processing capacity | MMcf			200
SemGas [Member] | Rose Valley II plant [Member] | Mid-America Midstream Gas Services, LLC [Member]
Business Acquisition [Line Items]
Processing capacity | MMcf			200
SemGas [Member] | Gathering and processing agreement [Member] | Mid-America Midstream Gas Services, LLC [Member]
Business Acquisition [Line Items]
Contract tenor			20 years
Percentage of contract which is fee based			100.00%
SemStream [Member] | General Partner [Member] | Ngl Energy Partners Lp [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage				11.78%
SemStream [Member] | General Partner [Member] | Additional interest acquired [Member] | Ngl Energy Partners Lp [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage						5.36%

Disposals of Long-Lived Assets

Disposals of Long-Lived Assets (Details Textual) - USD ($) $ in Millions	Jun. 02, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 01, 2014
Corporate and other [Member]
Impairment of Leasehold			$ 11.9
Eastern Oklahoma gas gathering assets [Member] | SemGas [Member]
Proceeds from sale of property, plant and equipment	$ 2.4
Disposal group, including discontinued operation, property, plant and equipment				$ 22.5
Kansas gas gathering and compression assets [Member] | SemGas [Member]
Proceeds from sale of property, plant and equipment		$ 1
Loss (gain) on impairment or disposal of long-lived assets, net [Member] | Eastern Oklahoma gas gathering assets [Member] | SemGas [Member]
Gain (loss) on disposal	$ (20.1)
Loss (gain) on impairment or disposal of long-lived assets, net [Member] | Kansas gas gathering and compression assets [Member] | SemGas [Member]
Gain (loss) on disposal		$ (1.7)

Segments (Details)

Segments (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Revenue		$ 382,493	$ 397,065	$ 377,226	$ 298,310	$ 547,237	$ 594,235	$ 482,224	$ 498,883	$ 1,455,094	$ 2,122,579	$ 1,427,016
Earnings from equity method investments		20,687	16,237	23,903	20,559	15,827	14,223	19,187	14,962	81,386	64,199	52,477
Depreciation and amortization expense										100,882	98,397	66,409
Income tax expense (benefit)		3,921	10,006	14,861	4,742	12,569	24,090	(6,672)	16,526	33,530	46,513	(17,254)
Total assets		2,870,690				2,589,802				2,870,690	2,589,802
Equity method investments		551,078				577,920				551,078	577,920
Unrealized Gain (Loss) on Derivatives										2,014	(1,734)	(974)
Interest Income (Expense), Net										69,675	49,044	25,142
Foreign Currency Transaction Gain (Loss), before Tax										(1,067)	(86)	(1,633)
Other Nonoperating Income (Expense)										(15,801)	(20,536)	45,906
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		1	1	2	0	(4)	0	0	5	4	1	(59)
Net income (loss)		(977)	$ 9,580	$ 28,433	$ 5,776	12,707	$ 32,196	$ (12,584)	$ 19,738	42,812	52,057	65,812
Crude Transportation [Member]
Segment Reporting Information
Earnings from equity method investments										76,355	61,856	45,354
Depreciation and amortization expense										35,500	33,679	17,814
Segment profit	[1]									81,028	76,705	51,100
Additions to long-lived assets										219,227	160,471	244,777
Total assets		877,017				746,723				877,017	746,723
Equity method investments		438,291				415,674				438,291	415,674
Crude Facilities [Member]
Segment Reporting Information
Depreciation and amortization expense										5,829	5,365	4,833
Segment profit	[1]									33,757	32,286	37,083
Additions to long-lived assets										30,118	8,207	11,783
Total assets		155,186				116,784				155,186	116,784
Crude Supply and Logistics [Member]
Segment Reporting Information
Depreciation and amortization expense										159	549	673
Segment profit	[1]									30,088	24,021	15,010
Additions to long-lived assets										2,564	11,662	1,868
Total assets		328,419				271,444				328,419	271,444
SemGas [Member]
Segment Reporting Information
Depreciation and amortization expense										31,803	26,353	14,517
Segment profit	[1]									61,669	41,715	32,483
Additions to long-lived assets										110,908	153,088	410,508
Total assets		719,789				662,223				719,789	662,223
SemCAMS [Member]
Segment Reporting Information
Depreciation and amortization expense										12,940	14,295	10,766
Income tax expense (benefit)										4,847	3,135	6,348
Segment profit	[1]									36,013	45,326	32,886
Additions to long-lived assets										142,368	35,286	56,122
Total assets		331,749				279,191				331,749	279,191
SemLogistics [Member]
Segment Reporting Information
Depreciation and amortization expense										8,543	10,005	9,426
Income tax expense (benefit)										(2,195)	(2,231)	(5,699)
Segment profit	[1]									7,249	25	(2,007)
Additions to long-lived assets										12,289	2,974	2,071
Total assets		155,794				150,498				155,794	150,498
SemMexico [Member]
Segment Reporting Information
Depreciation and amortization expense										4,076	6,031	5,991
Income tax expense (benefit)										2,611	4,053	2,589
Segment profit	[1]									15,614	16,139	13,493
Additions to long-lived assets										7,051	9,690	6,375
Total assets		89,608				107,225				89,608	107,225
SemStream [Member]
Segment Reporting Information
Earnings from equity method investments										11,416	31,363	33,996
Segment profit	[1]									11,391	31,280	33,389
Additions to long-lived assets										0	0	18,775
Total assets		112,787				162,246				112,787	162,246
Equity method investments		112,787				162,246				112,787	162,246
Corporate, Non-Segment [Member]
Segment Reporting Information
Depreciation and amortization expense										2,032	2,120	2,389
Income tax expense (benefit)										28,267	41,556	(20,492)
Segment profit	[1]									(44,760)	(43,841)	(30,088)
Additions to long-lived assets										1,919	1,906	1,211
Total assets		100,947				93,468				100,947	93,468
Operating Segments [Member]
Segment Reporting Information
Earnings from equity method investments										87,771	93,219	79,350
Depreciation and amortization expense										100,882	98,397	66,409
Income tax expense (benefit)										33,530	46,513	(17,254)
Segment profit	[1]									232,049	223,656	183,349
Additions to long-lived assets										526,444	383,284	753,490
Total assets		$ 2,871,296				$ 2,589,802				2,871,296	2,589,802
Operating Segments [Member]
Segment Reporting Information
Revenue										1,455,094	2,122,579	1,427,016
Operating Segments [Member] | Crude Transportation [Member]
Segment Reporting Information
Revenue										81,991	84,718	34,917
Operating Segments [Member] | Crude Facilities [Member]
Segment Reporting Information
Revenue										45,936	44,007	46,697
Operating Segments [Member] | Crude Supply and Logistics [Member]
Segment Reporting Information
Revenue										716,784	1,169,372	685,588
Operating Segments [Member] | SemGas [Member]
Segment Reporting Information
Revenue										231,569	342,286	207,134
Operating Segments [Member] | SemCAMS [Member]
Segment Reporting Information
Revenue										136,197	176,724	198,450
Operating Segments [Member] | SemLogistics [Member]
Segment Reporting Information
Revenue										24,351	12,650	11,671
Operating Segments [Member] | SemMexico [Member]
Segment Reporting Information
Revenue										211,291	290,869	242,559
Operating Segments [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information
Revenue										6,975	1,953	0
Intersegment Eliminations [Member] | Crude Transportation [Member]
Segment Reporting Information
Revenue										15,021	10,840	225
Intersegment Eliminations [Member] | SemGas [Member]
Segment Reporting Information
Revenue										20,605	37,897	23,985
Intersegment Eliminations [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information
Revenue										$ (35,626)	$ (48,737)	$ (24,210)
[1]	(1) Segment profit represents revenues excluding unrealized gains (losses) related to derivative instruments plus earnings from equity method investments less cost of sales excluding depreciation and amortization and less operating and general and administrative expenses.

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Crude oil	$ 59,121	$ 26,722
Asphalt and other	11,118	16,810
Inventories	$ 70,239	$ 43,532

Inventories (Details Textual)

Inventories (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Inventory valuation adjustment	$ 2,590	$ 5,667	$ 0
Crude Supply and Logistics [Member] | Crude Oil [Member]
Inventory [Line Items]
Inventory valuation adjustment	$ 2,600	$ 5,700

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Other prepaid expenses	$ 6,252	$ 5,989
Deferred tax asset	2,321	5,897
Other	10,814	8,131
Total other current assets	$ 19,387	$ 20,017

Other Assets (Details 1)

Other Assets (Details 1) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Debt issuance costs, net	[1]	$ 23,728	$ 22,203
Deferred tax asset		34,848	13,933
Other		3,579	8,250
Total other noncurrent assets, net		$ 62,155	$ 44,386
[1]	See Note 15 for discussion of debt issuance costs.

Property, Plant and Equipment75

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,886,590	$ 1,502,454
Accumulated depreciation	(319,769)	(245,629)
Property, plant and equipment, net	1,566,821	1,256,825
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	89,815	81,886
Pipelines and related facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	338,789	283,347
Storage and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	283,608	284,300
Natural gas gathering and processing facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	810,358	606,553
Linefill [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,900	26,050
Trucking equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,157	40,392
Office and other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,818	37,120
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 248,145	$ 142,806

Property, Plant and Equipment76

Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation	$ 90.5	$ 82.5	$ 60.4
Capitalized interest costs	$ 1	$ 1.5	$ 4.3

Goodwill and Other Intangible77

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 48,032	$ 58,326	$ 62,021	$ 9,884
Crude Transportation [Member]
Goodwill [Line Items]
Goodwill	26,628	36,116
SemGas [Member]
Goodwill [Line Items]
Goodwill	13,052	13,052
SemMexico [Member]
Goodwill [Line Items]
Goodwill	$ 8,352	$ 9,158

Goodwill and Other Intangible78

Goodwill and Other Intangible Assets (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 58,326	$ 62,021	$ 9,884
Currency translation adjustments	(806)	(702)	(24)
Goodwill, Ending Balance	48,032	58,326	62,021
SemGas [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	13,052
Goodwill, Ending Balance	13,052	13,052
Crude Transportation [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	36,116
Goodwill, Impairment Loss	(9,488)
Goodwill, Ending Balance	$ 26,628	36,116
Barcas Field Services, LLC [Member] | Crude Transportation [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period			28,322
Goodwill, Purchase Accounting Adjustments		(98)
Mid-America Midstream Gas Services, LLC [Member] | SemGas [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period			$ 23,839
Goodwill, Purchase Accounting Adjustments		(10,787)
Chesapeake crude oil trucking assets [Member] | Crude Transportation [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period		$ 7,892

Goodwill and Other Intangible79

Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 191,738	$ 193,610
Finite-Lived Intangible Assets, Accumulated Amortization	(29,515)	(20,545)
Finite-lived intangible assets, net	162,223	173,065	$ 174,838	$ 7,585
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	188,304	189,583
Finite-Lived Intangible Assets, Accumulated Amortization	(26,975)	(17,963)
Finite-lived intangible assets, net	161,329	171,620
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	493	570
Finite-Lived Intangible Assets, Accumulated Amortization	(378)	(379)
Finite-lived intangible assets, net	115	191
Unpatented Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,941	3,457
Finite-Lived Intangible Assets, Accumulated Amortization	(2,162)	(2,203)
Finite-lived intangible assets, net	$ 779	$ 1,254

Goodwill and Other Intangible80

Goodwill and Other Intangible Assets (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net, beginning balance	$ 173,065	$ 174,838	$ 7,585
Amortization	(10,334)	(15,875)	(6,018)
Currency translation adjustments	(508)	(545)	9
Finite-Lived Intangible Assets, Net, ending balance	$ 162,223	173,065	174,838
Barcas Field Services, LLC [Member] | Crude Transportation [Member]
Finite-Lived Intangible Assets [Line Items]
Customer contract intangible asset acquired			6,930
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments		(50)
Mid-America Midstream Gas Services, LLC [Member] | SemGas [Member]
Finite-Lived Intangible Assets [Line Items]
Customer contract intangible asset acquired			$ 166,332
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments		(2,313)
Chesapeake crude oil trucking assets [Member] | Crude Transportation [Member]
Finite-Lived Intangible Assets [Line Items]
Customer contract intangible asset acquired		$ 17,010

Goodwill and Other Intangible81

Goodwill and Other Intangible Assets (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Other Intangible Assets [Abstract]
For year ending, December 31, 2015	$ 10,928
For year ending, December 31, 2016	11,011
For year ending, December 31, 2017	10,918
For year ending, December 31, 2018	10,316
For year ending, December 31, 2019	9,649
Thereafter	109,401
Total estimated amortization expense	$ 162,223	$ 173,065	$ 174,838	$ 7,585

Goodwill and Other Intangible82

Goodwill and Other Intangible Assets (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Goodwill [Line Items]
Goodwill, Amortization Period for Income Taxes	15 years
NGL Energy [Member]
Goodwill [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 46,400
Glass Mountain Pipeline LLC [Member]
Goodwill [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	31,000
Crude Transportation [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 9,488

Financial Instruments and Con83

Financial Instruments and Concentrations of Risk (Details) - Commodity Derivatives [Member] - Level 1 [Member] - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 131	$ 3,311
Derivative Asset, Fair Value, Gross Liability	[1]	(131)	(1,637)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0	1,674
Derivative Liability, Fair Value, Gross Liability		470	1,637
Derivative Liability, Fair Value, Gross Asset	[1]	(131)	(1,637)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		$ 339	$ 0
[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 and Con84

Financial Instruments and Concentrations of Risk (Details 2) - bbl bbl in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sales [Member]
Derivative, Nonmonetary Notional Amount, Volume	23,228	6,773	2,595
Purchases [Member]
Derivative, Nonmonetary Notional Amount, Volume	22,946	6,477	2,575

Financial Instruments and Con85

Financial Instruments and Concentrations of Risk (Details 3) - Not Designated as Hedging Instrument [Member] - Commodity Contract [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 0	$ 1,674
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 339	$ 0

Financial Instruments and Con86

Financial Instruments and Concentrations of Risk (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commodity Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized and unrealized gains (losses) from commodity derivatives	$ 8,146	$ 19,305	$ (1,593)

Financial Instruments and Con87

Financial Instruments and Concentrations of Risk (Details 5) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration of net assets outside of the U.S.
Cash and cash equivalents	$ 58,096	$ 40,598	$ 79,351	$ 80,029
Other current assets	19,387	20,017
Total assets	2,870,690	2,589,802
Current liabilities	377,027	$ 391,662
Outside Of United States [Member]
Concentration of net assets outside of the U.S.
Cash and cash equivalents	46,081
Other current assets	82,296
Noncurrent assets	458,988
Total assets	587,365
Current liabilities	62,069
Noncurrent liabilities	64,771
Total liabilities	126,840
Net assets	460,525
CANADA
Concentration of net assets outside of the U.S.
Cash and cash equivalents	20,729
Other current assets	47,267
Noncurrent assets	273,967
Total assets	341,963
Current liabilities	40,541
Noncurrent liabilities	47,971
Total liabilities	88,512
Net assets	253,451
UNITED KINGDOM
Concentration of net assets outside of the U.S.
Cash and cash equivalents	8,014
Other current assets	3,413
Noncurrent assets	144,367
Total assets	155,794
Current liabilities	5,660
Noncurrent liabilities	15,633
Total liabilities	21,293
Net assets	134,501
MEXICO
Concentration of net assets outside of the U.S.
Cash and cash equivalents	17,338
Other current assets	31,616
Noncurrent assets	40,654
Total assets	89,608
Current liabilities	15,868
Noncurrent liabilities	1,167
Total liabilities	17,035
Net assets	$ 72,573

Financial Instruments and Con88

Financial Instruments and Concentrations of Risk (Details Textual)	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)employees	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)employeesCustomer	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Level 2 and level 3 fair value transactions									$ 0	$ 0	$ 0
Margin deposits	$ 2,900,000				$ 800,000				2,900,000	800,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,600,000				2,500,000				2,600,000	2,500,000
Fair Value Adjustment of Warrants									0	13,423,000	46,433,000
Revenues	$ 382,493,000	$ 397,065,000	$ 377,226,000	$ 298,310,000	$ 547,237,000	$ 594,235,000	$ 482,224,000	$ 498,883,000	$ 1,455,094,000	$ 2,122,579,000	1,427,016,000
Number of employees | employees	1,160								1,160
Unionized Employees Concentration Risk [Member] | Canada And Mexico [Member]
Number of employees	130								130
Number of employees with contracts expiring in collective bargaining agreements	68								68
Number of employees with contracts renewing collective bargaining agreements | employees	60								60
Sales Revenue, Goods, Net [Member] | Crude Supply and Logistics [Member]
Number of customers | Customer									2
Cost of Goods, Total [Member] | Crude Supply and Logistics [Member]
purchases of product									$ 232,600,000
Cost of Goods, Total [Member] | Customer Concentration Risk [Member] | Crude Supply and Logistics [Member]
Number of Suppliers									2
Concentration of risk, percentage									24.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Crude Supply and Logistics [Member]
Number of customers | Customer									1
Concentration of risk, percentage									39.00%
Processing volumes [Member] | SemGas [Member]
Concentration of risk, percentage									92.00%
Number of producers | Customer									3
Gathering volumes [Member] | SemGas [Member]
Concentration of risk, percentage									93.00%
Number of producers | Customer									3
Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Warrant liability											$ 58,100,000
Outside Of United States [Member]
Number of employees	555								555
Shell Trading Company [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenues									$ 457,300,000
BP Oil Supply Company [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenues									$ 146,200,000

Income Taxes (Details 1)

Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S.									$ 46,728	$ 39,231	$ 40,002
Foreign									29,618	59,340	8,497
Income (loss) from continuing operations before income taxes	$ 2,945	$ 19,587	$ 43,296	$ 10,518	$ 25,272	$ 56,286	$ (19,256)	$ 36,269	$ 76,346	$ 98,571	$ 48,499

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Deferred income tax provision (benefit)									$ 29,197	$ 36,148	$ (36,274)
Provision (benefit) for income taxes	$ 3,921	$ 10,006	$ 14,861	$ 4,742	$ 12,569	$ 24,090	$ (6,672)	$ 16,526	33,530	46,513	(17,254)
Continuing Operations [Member]
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Foreign									4,301	10,430	15,546
U.S. federal									0	(195)	2,067
U.S. state									32	132	1,435
Current income tax provision (benefit)									4,333	10,367	19,048
Foreign									4,747	2,024	(10,222)
U.S. federal									21,865	30,074	(23,756)
U.S. state									2,585	4,048	(2,324)
Deferred income tax provision (benefit)									29,197	36,146	(36,302)
Provision (benefit) for income taxes									$ 33,530	$ 46,513	$ (17,254)

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 2,945	$ 19,587	$ 43,296	$ 10,518	$ 25,272	$ 56,286	$ (19,256)	$ 36,269	$ 76,346	$ 98,571	$ 48,499
U.S. federal statutory rate									35.00%	35.00%	35.00%
Provision at statutory rate									$ 26,721	$ 34,500	$ 16,975
State income taxes—net of federal benefit									1,701	3,197	(577)
Effect of rates other than statutory									(2,306)	(1,925)	(1,041)
Effect of U.S. taxation on foreign branches									10,366	20,769	2,974
Foreign tax adjustment, prior years									7	(3,669)	4,533
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount									0	4,698	24,625
Noncontrolling interest									4,373	7,986	6,096
Foreign tax credit and offset to branch deferreds									(1,740)	6,851	(2,876)
Impact of valuation allowance on deferred tax assets									1,740	(7,331)	(53,218)
Foreign net gain on subsidiary dissolution and intercompany debt waivers									0	(13,620)	0
Foreign withholding taxes									6	5,054	0
Other, net									1,408	5,975	(2,553)
Provision (benefit) for income taxes	$ 3,921	$ 10,006	$ 14,861	$ 4,742	$ 12,569	$ 24,090	$ (6,672)	$ 16,526	$ 33,530	$ 46,513	$ (17,254)

Income Taxes (Details 4)

Income Taxes (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Components of Deferred Tax Assets [Abstract]
Net operating loss and other credit carryforwards	$ 55,100	$ 38,835
Compensation and benefits	8,178	10,736
Inventories	213	280
Intangible assets	35,152	43,977
Pension plan	4,643	3,733
Allowance for doubtful accounts	1,552	1,860
Deferred revenue	4,619	7,622
Foreign tax credit and offset to branch deferreds	104,026	102,286
Other	41,318	17,786
less: valuation allowance	(104,509)	(102,769)
Net deferred tax assets	150,292	124,346
Components of Deferred Tax Liabilities [Abstract]
Intangible assets	(4,638)	(5,770)
Prepaid expenses	(142)	(163)
Property, plant and equipment	(219,247)	(178,505)
Equity Investment in partnerships	(85,385)	(78,813)
Other	(4,107)	(2,549)
Total deferred tax liabilities	(313,519)	(265,800)
Net deferred tax liabilities	$ (163,227)	$ (141,454)

Income Taxes (Details Textual)

Income Taxes (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Operating Loss Carryforwards [Line Items]
Federal net operating loss	$ 127.9
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	90.4
U.S. Capital losses	23.6
Forgein income tax credits	59.3
Change in valuation allowance	1.7
Foreign tax credits and offset to branch deferreds [Member]
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ 1.7

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior notes	$ 300,000
Capital leases	83	$ 132
Total long-term debt	1,074,628	767,132
less: current portion of long-term debt	31	40
Noncurrent portion of long-term debt	1,074,597	767,092
Corporate Segment [Member]
Debt Instrument [Line Items]
Senior notes	300,000	300,000
Revolving Credit Facility [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Borrowings	30,000	35,000
Revolving Credit Facility [Member] | SemMexico [Member]
Debt Instrument [Line Items]
Borrowings	0	0
Rose Rock Midstream L P [Member]
Debt Instrument [Line Items]
Noncurrent portion of long-term debt	744,597	432,092
Rose Rock Midstream L P [Member] | Rose Rock Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior notes	400,000	400,000
Rose Rock Midstream L P [Member] | Rose Rock Notes due 2023 [Member]
Debt Instrument [Line Items]
Senior notes	344,545	0
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings	$ 0	$ 32,000

Long-Term Debt (Details 1)

Long-Term Debt (Details 1) - Corporate Segment [Member] - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2015
Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Redemption [Line Items]
Early redemption premium	105.625%
Debt Instrument, Redemption, Period Two [Member]
Debt Instrument, Redemption [Line Items]
Early redemption premium	103.75%
Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Redemption [Line Items]
Early redemption premium	101.875%
Debt Instrument, Redemption, Period Four [Member]
Debt Instrument, Redemption [Line Items]
Early redemption premium	100.00%

Long-Term Debt Long-Term Debt (

Long-Term Debt Long-Term Debt (Details 2) - Senior Notes [Member]	12 Months Ended
	Dec. 31, 2015
Rose Rock Notes due 2023 [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Early redemption premium	102.813%
Rose Rock Notes due 2023 [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Early redemption premium	101.406%
Rose Rock Notes due 2023 [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Early redemption premium	100.00%
Rose Rock Notes due 2022 [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Early redemption premium	104.219%
Rose Rock Notes due 2022 [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Early redemption premium	102.813%
Rose Rock Notes due 2022 [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Early redemption premium	101.406%
Rose Rock Notes due 2022 [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Early redemption premium	100.00%

Long-Term Debt (Details 3)

Long-Term Debt (Details 3) $ in Thousands	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	$ 31
Scheduled principal payments, year two	26
Scheduled principal payments, year three	30,026
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	1,050,000
Total long-term debt	1,080,083
Senior Notes [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	0
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	300,000
Total long-term debt	300,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	31
Scheduled principal payments, year two	26
Scheduled principal payments, year three	26
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	0
Total long-term debt	83
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	30,000
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	0
Total long-term debt	30,000
Rose Rock Midstream L P [Member] | Senior Notes [Member] | Rose Rock Notes due 2022 [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	0
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	400,000
Total long-term debt	400,000
Rose Rock Midstream L P [Member] | Senior Notes [Member] | Rose Rock Notes due 2023 [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	0
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	350,000
Total long-term debt	350,000
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	0
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	0
Total long-term debt	0
SemMexico [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	0
Scheduled principal payments, year two	0
Scheduled principal payments, year three	0
Scheduled principal payments, year four	0
Scheduled principal payments, year five	0
Scheduled principal payments, thereafter	0
Total long-term debt	$ 0

Long-Term Debt (Details Textual

Long-Term Debt (Details Textual) $ in Thousands, MXN in Millions	May. 14, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2015MXN
Rose Rock Midstream L P [Member] | Bilateral Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Letters of credit outstanding		$ 42,900
Interest rate in effect		1.75%			1.75%
Rose Rock Midstream L P [Member] | Minimum [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Line of Credit Facility, Interest Rate During Period		1.75%
Rose Rock Midstream L P [Member] | Maximum [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Line of Credit Facility, Interest Rate During Period		3.00%
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Interest expense recorded		$ 6,900	$ 9,000	$ 8,700
Maximum borrowing capacity		585,000
Borrowings outstanding		0	32,000
Line of Credit Facility, Maximum Borrowing Incremental Increases		200,000
Debt Instrument Annual Administrative Fee		100
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Maximum borrowing capacity		150,000
Letters of credit outstanding		$ 35,300
Interest rate in effect		2.50%			2.50%
Percentage of line of credit facility fronting fee		0.25%
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Commitment fee on unused capacity		0.375%
Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Commitment fee on unused capacity		0.50%
Rose Rock Notes due 2022 [Member] | Rose Rock Midstream L P [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount		$ 400,000
Rose Rock Notes due 2022 [Member] | Rose Rock Midstream L P [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument, interest rate stated percentage		5.625%			5.625%
Interest expense recorded		$ 23,500	11,700
Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument, interest rate stated percentage		7.50%			7.50%
Rose Rock Notes due 2023 [Member] | Rose Rock Midstream L P [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount		$ 350,000
Rose Rock Notes due 2023 [Member] | Rose Rock Midstream L P [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument, interest rate stated percentage		5.625%			5.625%
Interest expense recorded		$ 13,200
Debt Instrument, Discount, Percentage	98.345%
Debt Instrument, Unamortized Discount	$ 5,800	$ 5,500
Proceeds from Issuance of Debt	337,700
Deferred borrowing costs	$ 6,500
Rose Rock notes [Member]
Debt Instrument [Line Items]
Percent of senior notes redeemable from offering proceeds		35.00%
Rose Rock notes [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Basis point adjustment to discount rate		50			50
Sale of stock [Member] | Rose Rock notes [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Early redemption premium		105.625%
Change of control [Member] | Rose Rock notes [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Early redemption premium		101.00%
Corporate Segment [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Face Amount		$ 300,000
Senior Notes Redemable Prior to June 15, 2016		35.00%
Corporate Segment [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Interest expense recorded		$ 3,800	6,300	7,700
Maximum borrowing capacity		500,000
Borrowings outstanding		30,000	35,000
Line of Credit Facility, Maximum Borrowing Incremental Increases		300,000
Debt Instrument Annual Administrative Fee		100
Corporate Segment [Member] | Revolving Credit Facility [Member] | Alternate Base Rate Borrowings [Member]
Long Term Debt (Textual) [Abstract]
Borrowings outstanding		$ 30,000
Interest rate in effect		4.50%			4.50%
Corporate Segment [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Interest rate in effect		2.00%			2.00%
Commitment fee on unused capacity		0.375%
Corporate Segment [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Interest rate in effect		3.25%			3.25%
Commitment fee on unused capacity		0.50%
Corporate Segment [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Maximum borrowing capacity		$ 250,000
Letters of credit outstanding		$ 4,700
Interest rate in effect		2.00%			2.00%
Percentage of line of credit facility fronting fee		0.25%
Corporate Segment [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument, interest rate stated percentage		7.50%			7.50%
Interest expense recorded		$ 23,300	23,300	12,700
SemMexico [Member]
Long Term Debt (Textual) [Abstract]
Interest expense recorded		100	200	$ 200
SemMexico [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Maximum borrowing capacity		5,800			MXN 100
Borrowings outstanding		0	$ 0
SemMexico [Member] | Revolving Credit Facility [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Letters of credit outstanding		$ 16,900			MXN 292.8
SemMexico [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Letter of Credit [Member]
Long Term Debt (Textual) [Abstract]
Interest rate in effect		0.25%			0.25%
Fair Value, Inputs, Level 2 [Member] | Rose Rock Notes due 2022 [Member] | Rose Rock Midstream L P [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Long-term Debt, Fair Value		$ 337,000
Fair Value, Inputs, Level 2 [Member] | Rose Rock Notes due 2023 [Member] | Rose Rock Midstream L P [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Long-term Debt, Fair Value		300,000
Fair Value, Inputs, Level 2 [Member] | Corporate Segment [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Long-term Debt, Fair Value		$ 279,000
Redemption prior to June 15, 2016 [Member] | Rose Rock notes [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Debt instrument redemption premium		1.00%
Redemption prior to June 15, 2016 [Member] | Corporate Segment [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Early redemption premium		1.00%
Basis point adjustment to discount rate		50			50
Redemption prior to June 15, 2016 [Member] | Corporate Segment [Member] | Sale of stock [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Early redemption premium		107.50%
Redemption prior to June 15, 2016 [Member] | Corporate Segment [Member] | Change of control [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Early redemption premium		101.00%
Eurodollar [Member] | Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Eurodollar [Member] | Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		3.00%
Eurodollar [Member] | Corporate Segment [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Eurodollar [Member] | Corporate Segment [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		3.25%
Base Rate [Member] | Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		0.75%
Base Rate [Member] | Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Base Rate [Member] | Corporate Segment [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Base Rate [Member] | Corporate Segment [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		2.25%
Mexican bank prime rate [Member] | SemMexico [Member] | Line of Credit [Member]
Long Term Debt (Textual) [Abstract]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Other Noncurrent Assets [Member] | Rose Rock Midstream L P [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		$ 2,800
Other Noncurrent Assets [Member] | Rose Rock notes [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		12,200
Other Noncurrent Assets [Member] | Corporate Segment [Member] | Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		4,200
Other Noncurrent Assets [Member] | Corporate Segment [Member] | Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Deferred Finance Costs, Noncurrent, Net		$ 4,500

Commitments and Contingencies99

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 41,954	$ 41,185	$ 40,105
Accretion	4,748	4,807	4,752
Payments made	(511)	(514)	(808)
Asset Retirement Obligation, Revision of Estimate	(26,000)
Currency translation adjustments	(4,245)	(3,524)	(2,864)
Ending Balance	$ 15,946	$ 41,954	$ 41,185

Commitments and Contingencie100

Commitments and Contingencies (Details 1) $ in Thousands	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Due next twelve months	$ 9,218
Operating Leases, Due in Two Years	7,001
Operating Leases, Due in Three Years	3,055
Operating Leases, Due in Four Years	1,941
Operating Leases, Due in Five Years	157
Operating Leases, Thereafter	6,814
Operating Leases, Total future minimum lease payments	$ 28,186

Commitments and Contingencie101

Commitments and Contingencies (Details 2) bbl in Thousands, $ in Thousands	Dec. 31, 2015USD ($)bbl
Fixed Price Sales [Member]
Summary Of Purchase And Sale Commitments
Sale commitments, Volume (barrels) | bbl	2,907
Sale commitments, Value | $	$ 116,329
Floating Price Sales [Member]
Summary Of Purchase And Sale Commitments
Sale commitments, Volume (barrels) | bbl	19,691
Sale commitments, Value | $	$ 709,991
Fixed Price Purchases [Member]
Summary Of Purchase And Sale Commitments
Purchase commitments, Volume (barrels) | bbl	1,976
Purchase commitments, Value | $	$ 71,709
Floating Price Purchases [Member]
Summary Of Purchase And Sale Commitments
Purchase commitments, Volume (barrels) | bbl	17,361
Purchase commitments, Value | $	$ 652,122

Commitments and Contingencie102

Commitments and Contingencies (Details 3) - Fractionation capacity [Member] $ in Thousands	Dec. 31, 2015USD ($)
Long-term Purchase Commitment [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 11,804
Purchase Obligation, Due in Second Year	11,938
Purchase Obligation, Due in Third Year	10,060
Purchase Obligation, Due in Fourth Year	9,121
Purchase Obligation, Due in Fifth Year	8,451
Purchase Obligation, Due after Fifth Year	15,941
Purchase Obligation	$ 67,315

Commitments and Contingencie103

Commitments and Contingencies (Details Textual) bbl in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)bblNumber_Of_Sites	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	6
Number of sites appearing to have soil contamination | Number_Of_Sites	4
Number of sites requiring remediation and water contamination as per phase two investigations | Number_Of_Sites	4
Number of sites closed | Number_Of_Sites	1
Estimated cost to retire facilities	$ 117,800,000
Asset Retirement Obligation, Revision of Estimate	(26,000,000)
Asset retirement obligation additional estimated costs attributable to third-party owners'	20,000,000
Operating leases, rent expense	$ 15,500,000	$ 16,200,000	$ 11,400,000
Sites being monitored for ground water contamination	2
Sites completing assessment	2
Crude Transportation [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	5
SemGas [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	1
Minimum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice required to cancel purchase agreements, days	30 days
Maximum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice required to cancel purchase agreements, days	120 days
SemCAMS [Member]
Commitments and Contingencies (Textual) [Abstract]
Asset Retirement Obligation, Revision of Estimate	$ (26,000,000)
Pipeline transportation capacity [Member] | Rose Rock Midstream L P [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | bbl	5
Term of unconditional purchase obligation	7 years
Unrecorded unconditional purchase obligation, annual amount	$ 11,900,000
Pipeline transportation capacity [Member] | White Cliffs Pipeline, LLC [Member] | Rose Rock Midstream L P [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | bbl	5
Term of unconditional purchase obligation	5 years
Unrecorded unconditional purchase obligation, annual amount	$ 9,400,000
Pipeline transportation capacity [Member] | SemGas [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation	110,700
Capital Addition Purchase Commitments [Member] | Maurepas Pipeline, LLC [Member]
Commitments and Contingencies (Textual) [Abstract]
Purchase Obligation, Due in Next Twelve Months	$ 325,000,000

Equity (Details)

Equity (Details) - shares		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Schedule of Common Stock
Stock Issued During Period, Shares, Employee Stock Purchase Plans		24,882		6,999
Shares paid for tax withholding		62,291		11,120	8,591
Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				904,231	425,618
Common Class A [Member]
Schedule of Common Stock
Common Stock, Shares, Outstanding		43,614,054		42,504,656	41,971,050
Stock Issued During Period, Shares, Employee Stock Purchase Plans		24,882		6,999
Common Stock, Shares, Outstanding		43,823,739	[1]	43,614,054	42,504,656
Common Class A [Member] | Issuance of shares under employee and director compensation programs [Member]
Schedule of Common Stock
Awards vested, shares	[2]	184,803		169,933	107,988
Common Class A [Member] | Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				904,231	425,618
Common Class A [Member] | Conversion of class B shares [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				28,235
Class B
Schedule of Common Stock
Common Stock, Shares, Outstanding		0		28,235	28,235
Stock Issued During Period, Shares, Employee Stock Purchase Plans		0		0
Awards vested, shares		0		0	0
Common Stock, Shares, Outstanding		0		0	28,235
Class B | Shares issued upon exercise of warrants [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				0	0
Class B | Conversion of class B shares [Member]
Schedule of Common Stock
Stock Issued During Period, Shares, Conversion of Convertible Securities				(28,235)
[1]	(2) In addition to the shares in the table above, there are shares of unvested restricted stock outstanding at December 31, 2015. The par value of these shares has not yet been reflected in common stock on the consolidated balance sheet, as these shares have not yet vested. There are also shares of restricted stock that were returned to treasury upon forfeiture. The par value of these shares is not reflected in the consolidated balance sheet, as no accounting recognition is given to forfeited shares. Certain unvested restricted stock is considered legally issued and outstanding and is included in the number of shares presented on the consolidated balance sheets.
[2]	(1) Of these vested shares, recipients sold back to the Company 62,291, 11,120 and 8,591 shares during the years ended December 31, 2015, 2014 and 2013, respectively, to satisfy tax withholding obligations. These repurchased shares are being recognized at cost as treasury stock on the consolidated balance sheet.

Equity Equity (Details 2)

Equity Equity (Details 2) - $ / shares

Mar. 17, 2016

Nov. 24, 2015

Aug. 25, 2015

May. 29, 2015

Mar. 20, 2015

Nov. 28, 2014

Aug. 29, 2014

Mar. 10, 2014

May. 19, 2014

Nov. 22, 2013

Aug. 19, 2013

May. 30, 2013

Dec. 31, 2015

Dividends paid

$ 0.45

$ 0.42

$ 0.38

$ 0.34

$ 0.30

$ 0.27

$ 0.22

$ 0.24

$ 0.21

$ 0.20

$ 0.19

Dividends Payable, Date to be Paid

Nov. 24, 2015

Aug. 25, 2015

May 29, 2015

Mar. 20, 2015

Nov. 28, 2014

Aug. 28, 2014

Mar. 20, 2014

May 29, 2014

Dec. 3, 2013

Aug. 30, 2013

May 30, 2013

Second quarter 2013 dividend [Member]

Dividends, date declared

May 8, 2013

Dividends, date of record

May 20, 2013

Third quarter 2013 dividend [Member]

Dividends, date declared

Aug. 8, 2013

Dividends, date of record

Aug. 19, 2013

Fourth quarter 2013 dividend [Member]

Dividends, date declared

Nov. 11, 2013

Dividends, date of record

Nov. 22, 2013

First quarter 2014 dividend [Member]

Dividends, date declared

Feb. 25, 2014

Dividends, date of record

Mar. 10, 2014

Second quarter 2014 dividend [Member] [Member]

Dividends, date declared

May 8, 2014

Dividends, date of record

May 19, 2014

Third quarter 2014 dividend [Member]

Dividends, date declared

Aug. 6, 2014

Dividends, date of record

Aug. 18, 2014

Fourth quarter 2014 dividend [Member]

Dividends, date declared

Nov. 6, 2014

Dividends, date of record

Nov. 17, 2014

First quarter 2015 dividend [Member]

Dividends, date declared

Feb. 26, 2015

Dividends, date of record

Mar. 9, 2015

Second quarter 2015 dividend [Member]

Dividends, date declared

May 6, 2015

Dividends, date of record

May 18, 2015

Third quarter 2015 dividend [Member] [Member]

Dividends, date declared

Aug. 4, 2015

Dividends, date of record

Aug. 17, 2015

Fourth quarter 2015 dividend [Member]

Dividends, date declared

Nov. 3, 2015

Dividends, date of record

Nov. 16, 2015

first quarter 2016 dividend [Member]

Dividends, date declared

Feb. 24, 2016

Dividends, date of record

Mar. 7, 2016

Subsequent Event [Member]

Dividends Payable, Date to be Paid

Mar. 17, 2016

Common Stock, Dividends, Per Share, Declared

$ 0.45

Equity (Details Textual)

Equity (Details Textual) - $ / shares	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2014	Dec. 31, 2012
Equity [Line Items]
Shares paid for tax withholding	62,291		11,120	8,591
Common stock shares authorized	100,000,000		100,000,000
Par value per share	$ 0.01		$ 0.01
Price of purchase of one share of common stock against warrant					$ 25
Class A [Member]
Equity [Line Items]
Common stock shares authorized	90,000,000
Par value per share	$ 0.01
Common Stock, Shares, Outstanding	43,823,739	[1]	43,614,054	42,504,656		41,971,050
Class B [Member]
Equity [Line Items]
Common stock shares authorized	10,000,000
Par value per share	$ 0.01
Common Stock, Shares, Outstanding	0		0	28,235		28,235
Awards vested, shares	0		0	0
Shares issued upon exercise of warrants [Member]
Equity [Line Items]
Stock issued from warrant exercises, shares			904,231	425,618
Shares issued upon exercise of warrants [Member] | Class A [Member]
Equity [Line Items]
Stock issued from warrant exercises, shares			904,231	425,618
Shares issued upon exercise of warrants [Member] | Class B [Member]
Equity [Line Items]
Stock issued from warrant exercises, shares			0	0
[1]	(2) In addition to the shares in the table above, there are shares of unvested restricted stock outstanding at December 31, 2015. The par value of these shares has not yet been reflected in common stock on the consolidated balance sheet, as these shares have not yet vested. There are also shares of restricted stock that were returned to treasury upon forfeiture. The par value of these shares is not reflected in the consolidated balance sheet, as no accounting recognition is given to forfeited shares. Certain unvested restricted stock is considered legally issued and outstanding and is included in the number of shares presented on the consolidated balance sheets.

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent									$ 42,816	$ 52,058	$ 65,753
Basic earnings per share
Net income (loss)	$ (977)	$ 9,580	$ 28,433	$ 5,776	$ 12,707	$ 32,196	$ (12,584)	$ 19,738	42,812	52,057	65,812
Income (loss) from discontinued operations, net of income taxes	(1)	(1)	(2)	0	4	0	0	(5)	(4)	(1)	59
less: Income attributable to noncontrolling interest	$ (1,661)	$ 4,707	$ 5,136	$ 4,310	$ 4,633	$ 6,934	$ 5,025	$ 6,150	12,492	22,817	17,710
Net Income (Loss) Available to Common Stockholders, Basic									$ 30,320	$ 29,240	$ 48,102
Weighted average common stock outstanding									43,787	42,665	42,339
Basic earnings (loss) per share, net	$ 0.02	$ 0.11	$ 0.53	$ 0.03	$ 0.19	$ 0.59	$ (0.41)	$ 0.32	$ 0.69	$ 0.69	$ 1.14
Continuing Operations [Member]
Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent									$ 42,816	$ 52,058	$ 65,753
Basic earnings per share
less: Income attributable to noncontrolling interest									12,492	22,817	17,710
Net Income (Loss) Available to Common Stockholders, Basic									$ 30,324	$ 29,241	$ 48,043
Weighted average common stock outstanding									43,787	42,665	42,339
Basic earnings (loss) per share from continuing operations									$ 0.69	$ 0.69	$ 1.13
Discontinued Operations [Member]
Basic earnings per share
Income (loss) from discontinued operations, net of income taxes									$ (4)	$ (1)	$ 59
less: Income attributable to noncontrolling interest									0	0	0
Net Income (Loss) Available to Common Stockholders, Basic									$ (4)	$ (1)	$ 59
Weighted average common stock outstanding									43,787	42,665	42,339
Basic earnings (loss) per share from discontinued operations									$ 0	$ 0	$ 0

Earnings Per Share (Details 1)

Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent									$ 42,816	$ 52,058	$ 65,753
Diluted earnings per share
Net income (loss)	$ (977)	$ 9,580	$ 28,433	$ 5,776	$ 12,707	$ 32,196	$ (12,584)	$ 19,738	42,812	52,057	65,812
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1)	(1)	(2)	0	4	0	0	(5)	(4)	(1)	59
Less: net income attributable to noncontrolling interests	$ (1,661)	$ 4,707	$ 5,136	$ 4,310	$ 4,633	$ 6,934	$ 5,025	$ 6,150	12,492	22,817	17,710
Net Income (Loss) Available to Common Stockholders, Diluted									$ 30,320	$ 29,240	$ 48,102
Weighted Average Number of Shares Issued, Basic									43,787	42,665	42,339
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares									183	302	307
Diluted weighted average common stock outstanding									43,970	42,967	42,646
Earnings Per Share, Diluted	$ 0.02	$ 0.11	$ 0.53	$ 0.03	$ 0.18	$ 0.59	$ (0.41)	$ 0.29	$ 0.69	$ 0.68	$ 1.13
Continuing Operations [Member]
Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent									$ 42,816	$ 52,058	$ 65,753
Diluted earnings per share
Less: net income attributable to noncontrolling interests									12,492	22,817	17,710
Net Income (Loss) Available to Common Stockholders, Diluted									$ 30,324	$ 29,241	$ 48,043
Weighted Average Number of Shares Issued, Basic									43,787	42,665	42,339
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares									183	302	307
Diluted weighted average common stock outstanding									43,970	42,967	42,646
Income (Loss) from Continuing Operations, Per Diluted Share									$ 0.69	$ 0.68	$ 1.13
Discontinued Operations [Member]
Diluted earnings per share
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									$ (4)	$ (1)	$ 59
Less: net income attributable to noncontrolling interests									0	0	0
Net Income (Loss) Available to Common Stockholders, Diluted									$ (4)	$ (1)	$ 59
Weighted Average Number of Shares Issued, Basic									43,787	42,665	42,339
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares									183	302	307
Diluted weighted average common stock outstanding									43,970	42,967	42,646
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 0	$ 0	$ 0

Equity-Based Compensation (Deta

Equity-Based Compensation (Details) - Stock Compensation Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding, shares	449,919	530,603	450,552
Awards granted, shares	151,789	207,786	201,451
Awards vested, shares	(181,906)	(169,340)	(107,988)
Awards forfeited, shares	(8,494)	(119,130)	(13,412)
Outstanding, shares	411,308	449,919	530,603
Awards outstanding, average grant date fair value	$ 70.69	$ 36.80	$ 26.87
Awards granted, average grant date fair value per share	77.93	77.14	52.78
Awards vested, average grant date fair value per share	35.18	33.07	25.71
Awards forfeited, average grant date fair value per share	42.05	42.16	32.36
Awards outstanding, average grant date fair value	$ 75.25	$ 70.69	$ 36.80
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 6,399	$ 5,600	$ 2,776

Equity-Based Compensation (D110

Equity-Based Compensation (Details 1) - Rose Rock Midstream L P [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, shares	102,340	82,948	43,960
Awards granted, shares	36,527	46,536	49,104
Awards vested, shares	(38,366)	(5,712)	(9,333)
Awards forfeited, shares	(310)	(21,432)	(783)
Outstanding, shares	100,191	102,340	82,948
Awards outstanding, average grant date fair value	$ 33.79	$ 28.59	$ 21.91
Awards granted, average grant date fair value per share	39.03	41.35	34.41
Awards vested, average grant date fair value per share	27.54	35.87	27.25
Awards forfeited, average grant date fair value per share	42.80	29.82	34.40
Awards outstanding, average grant date fair value	$ 38.70	$ 33.79	$ 28.59
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 1,057	$ 205	$ 254

Equity-Based Compensation (D111

Equity-Based Compensation (Details 2)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	26.80%	29.30%	28.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.06%	0.66%	0.35%

Equity-Based Compensation (D112

Equity-Based Compensation (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares paid for tax withholding	62,291	11,120	8,591
Shares issued based on unit distribution rights vested during period	1,793	593	0
Equity-based compensation expense recognized	$ 9,100	$ 7,300	$ 6,500
Unrecognized compensation expense for nonvested awards	$ 13,000
Weighted average vesting period	17 months
Employee stock purchase plan maximum contribution	10.00%
Employee stock purchase plan discounted price	85.00%
Shares authorized for employee stock purchase plan	1,000,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	24,882	6,999
Percentage of volatility assumption based on historical volatility			50.00%
Percentage of volatility assumption based on implied volatility			50.00%
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance pursuant to employee and director compensation programs	2,781,635
Awards vested, shares	181,906	169,340	107,988
Shares paid for tax withholding	62,291	11,120	8,591
2015 stock compensation awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation awards which could vest if certain targets are met	72,000
Cash settled UUD [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Dividend Equivalent Value	$ 595
2014 stock compensation awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation awards which could vest if certain targets are met	51,000
2013 stock compensation awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation awards which could vest if certain targets are met	47,000
Rose Rock equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense recognized	$ 1,400	$ 900	$ 800
Unrecognized compensation expense for nonvested awards	$ 1,900
Weighted average vesting period	14 months
Rose Rock equity incentive plan [Member] | Cash settled UUD [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Dividend Equivalent Value	$ 381
Rose Rock equity incentive plan [Member] | Distribution equivalent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested, shares	3,335	0	406
Rose Rock Midstream L P [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested, shares	38,366	5,712	9,333
Rose Rock Midstream L P [Member] | Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares paid for tax withholding	12,892	0	0
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Goods and Nonemployee Services Transaction, Securities Issued	1,104

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 23,865	$ 29,266
Fair value of plan assets	22,204	26,368
Other Noncurrent Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded status:	$ (1,661)	$ (2,898)

Employee Benefit Plans (Deta114

Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Postretirement Benefits [Line Items]
Contributions to the defined contribution plans	$ 2,400	$ 1,900	$ 1,100
Funded status of the pension plans to other comprehensive income (loss), net of income taxes	700	(3,700)	$ 4,800
Projected benefit obligation	23,865	29,266
Other Noncurrent Liabilities [Member]
Postretirement Benefits [Line Items]
Funded status of the Pension Plans	(1,661)	(2,898)
Postretirement Health Coverage [Member] | Other Noncurrent Liabilities [Member]
Postretirement Benefits [Line Items]
Projected benefit obligation	$ 1,400	$ 1,700

Accumulated Other Comprehens115

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Beginning Balance	$ (27,141)	$ (2,854)	$ (1,299)
Currency translation adjustments	(32,142)	(20,551)	(6,363)
Changes related to benefit plans, net of income tax expense	721	(3,736)	4,808
Ending Balance	(58,562)	(27,141)	(2,854)
Currency Translation [Member]
Beginning Balance	(25,059)	(4,508)	1,855
Currency translation adjustments	(32,142)	(20,551)	(6,363)
Changes related to benefit plans, net of income tax expense	0	0	0
Ending Balance	(57,201)	(25,059)	(4,508)
Employee Benefit Plans [Member]
Beginning Balance	(2,082)	1,654	(3,154)
Currency translation adjustments	0	0	0
Changes related to benefit plans, net of income tax expense	(721)	3,736	4,808
Ending Balance	$ (1,361)	$ (2,082)	$ 1,654

Accumulated Other Comprehens116

Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Changes related to benefit plans, income tax expense (benefit)	$ 240	$ (1,245)	$ 1,603
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	$ (19,593)	$ (11,102)	$ (3,993)

Supplemental Cash Flow Infor117

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of operating assets and liabilities
Decrease (increase) in restricted cash	$ 6,764	$ (2,045)	$ 29,467
Decrease (increase) in accounts receivable	9,051	(32,602)	11,172
Decrease (increase) in receivable from affiliates	10,905	50,454	(61,095)
Decrease (increase) in inventories	(31,043)	(6,243)	(11,352)
Decrease (increase) in derivatives and margin deposits	(2,109)	28	1,012
Decrease (increase) in other current assets	(413)	(614)	9,361
Increase (decrease) in other noncurrent assets	(4,015)	(2)	(137)
Increase (decrease) in accounts payable and accrued liabilities	2,513	11,461	31,030
Increase (decrease) in payable to affiliates	(8,427)	(48,819)	62,279
Increase (decrease) in payables to pre-petition creditors	(3,837)	(54)	(29,609)
Increase (decrease) in other noncurrent liabilities	(2,625)	5,067	(2,541)
Total changes in operating assets and liabilities	$ (15,206)	$ (23,365)	$ 39,861

Supplemental Cash Flow Infor118

Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Significant Noncash Transactions [Line Items]
Sale of interest in equity investment to related party	$ 20,772	$ 31,930	$ 67,291
Tax effect of adjustment to APIC from sale of equity investment to less than wholly owned subsidiary	20,800	31,930	67,291
Proceeds from warrant exercises	0	1,451	225
Interest Paid	64,900	36,700	23,900
Income taxes (net of refunds received)	7,300	23,500	13,900
Capital Expenditures Incurred but Not yet Paid	11,800	7,000	10,100
Proceeds from Sale of Equity Method Investments	56,318	79,741	0
Noncontrolling Interest [Member]
Other Significant Noncash Transactions [Line Items]
Sale of interest in equity investment to related party	51,452	85,173	180,220
Additional Paid-in Capital [Member]
Other Significant Noncash Transactions [Line Items]
Sale of interest in equity investment to related party	(30,680)	$ (53,243)	$ (112,929)
Shares issued upon exercise of warrants [Member]
Other Significant Noncash Transactions [Line Items]
Stock issued from warrant exercises, shares		904,231	425,618
Warrant [Member]
Other Significant Noncash Transactions [Line Items]
Increase in additional paid in capital due to warrant exercises		$ 73,000	$ 21,400
Ngl Energy Partners Lp [Member]
Other Significant Noncash Transactions [Line Items]
Proceeds from Sale of Equity Method Investments		88,800
Proceeds from Sale of Equity Method Investments	$ 56,300	$ 79,700

Quarterly Financial Data (Detai

Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Revenues	$ 382,493	$ 397,065	$ 377,226	$ 298,310	$ 547,237	$ 594,235	$ 482,224	$ 498,883	$ 1,455,094	$ 2,122,579	$ 1,427,016
Loss (gain) on disposal or impairment of long-lived assets, net	9,993	(951)	1,372	1,058	(11,959)	1,376	19,315	(58)	11,472	32,592	(239)
Other operating costs and expenses	371,512	376,973	352,549	301,206	530,150	575,936	471,863	478,264	1,402,240	2,056,213
Total expenses	381,505	376,022	353,921	302,264	542,109	577,312	491,178	478,206	1,413,712	2,088,805	1,388,452
Earnings from equity method investments	20,687	16,237	23,903	20,559	15,827	14,223	19,187	14,962	81,386	64,199	52,477
Gain on issuance of common units by equity method investee	352	136	5,897	0	2,121	18,772	0	8,127	6,385	29,020	26,873
Operating income	22,027	37,416	53,105	16,605	23,076	49,918	10,233	43,766	129,153	126,993	117,914
Other expenses, net	19,082	17,829	9,809	6,087	(2,196)	(6,368)	29,489	7,497	52,807	28,422	69,415
Income (loss) from continuing operations before income taxes	2,945	19,587	43,296	10,518	25,272	56,286	(19,256)	36,269	76,346	98,571	48,499
Income tax expense (benefit)	3,921	10,006	14,861	4,742	12,569	24,090	(6,672)	16,526	33,530	46,513	(17,254)
Income (loss) from continuing operations	(976)	9,581	28,435	5,776	12,703	32,196	(12,584)	19,743	42,816	52,058	65,753
Income (loss) from discontinued operations, net of income taxes	(1)	(1)	(2)	0	4	0	0	(5)	(4)	(1)	59
Net income (loss)	(977)	9,580	28,433	5,776	12,707	32,196	(12,584)	19,738	42,812	52,057	65,812
Less: net income attributable to noncontrolling interests	(1,661)	4,707	5,136	4,310	4,633	6,934	5,025	6,150	12,492	22,817	17,710
Net income (loss) attributable to SemGroup	$ 684	$ 4,873	$ 23,297	$ 1,466	$ 8,074	$ 25,262	$ (17,609)	$ 13,588	$ 30,320	$ 29,240	$ 48,102
Basic earnings (loss) per share, net	$ 0.02	$ 0.11	$ 0.53	$ 0.03	$ 0.19	$ 0.59	$ (0.41)	$ 0.32	$ 0.69	$ 0.69	$ 1.14
Earnings Per Share, Diluted	$ 0.02	$ 0.11	$ 0.53	$ 0.03	$ 0.18	$ 0.59	$ (0.41)	$ 0.29	$ 0.69	$ 0.68	$ 1.13

Related Party Transactions (Det

Related Party Transactions (Details) - NGL Energy [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction
Revenues from related party	$ 157,732	$ 456,987	$ 796,440
Purchases from related party	138,095	437,015	669,450
Reimbursements from NGL Energy for transition services	$ 56	$ 168	$ 198

Related Party Transactions (121

Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Glass Mountain Pipeline LLC [Member]
Related Party Transactions (Textual) [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 5,100,000	$ 800,000
Related Party Reimbursement of Expense from a Related Party Transaction	800,000	700,000
White Cliffs Pipeline, LLC [Member]
Related Party Transactions (Textual) [Abstract]
Revenues from related party	4,800,000	2,900,000	$ 2,900,000
Related Party Transaction, Expenses from Transactions with Related Party	5,200,000	3,900,000
Law Firm [Member]
Related Party Transactions (Textual) [Abstract]
Legal fees	1,300,000	1,300,000	1,900,000
White Cliffs Pipeline, LLC [Member] | Law Firm [Member]
Related Party Transactions (Textual) [Abstract]
Legal fees	$ 3,400	$ 100,000	$ 200,000

Condensed Consolidating Guar122

Condensed Consolidating Guarantor Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 58,096				$ 40,598				$ 58,096	$ 40,598	$ 79,351	$ 80,029
Restricted cash	32				6,980				32	6,980
Accounts Receivable, net	326,713				351,334				326,713	351,334
Receivable from affiliates	5,914				16,819				5,914	16,819
Inventories	70,239				43,532				70,239	43,532
Other current assets	19,387				20,017				19,387	20,017
Total current assets	480,381				479,280				480,381	479,280
Property, plant and equipment	1,566,821				1,256,825				1,566,821	1,256,825
Equity method investments	551,078				577,920				551,078	577,920
Goodwill	48,032				58,326				48,032	58,326	62,021	9,884
Other intangible assets	162,223				173,065				162,223	173,065
Other noncurrent assets	62,155				44,386				62,155	44,386
Total assets	2,870,690				2,589,802				2,870,690	2,589,802
Accounts payable	273,666				257,177				273,666	257,177
Due to Related Parties, Current	5,033				13,460				5,033	13,460
Accrued liabilities	85,047				92,694				85,047	92,694
Payables to pre-petition creditors	0				3,129				0	3,129
Deferred revenue	11,349				23,688				11,349	23,688
Other Liabilities, Current	1,901				1,474				1,901	1,474
Other Liabilities, Current					1,474					1,474
Current portion of long-term debt	31				40				31	40
Total current liabilities	377,027				391,662				377,027	391,662
Long-term debt	1,074,597				767,092				1,074,597	767,092
Deferred income taxes	200,953				161,956				200,953	161,956
Other noncurrent liabilities	$ 21,757				$ 49,655				$ 21,757	$ 49,655
Commitments and contingencies
Stockholders' Equity Attributable to Parent	$ 1,115,527				$ 1,149,508				$ 1,115,527	$ 1,149,508
Noncontrolling interests in consolidated subsidiaries	80,829				69,929				80,829	69,929
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,196,356				1,219,437				1,196,356	1,219,437	1,213,863	1,021,528
Liabilities and Equity	2,870,690				2,589,802				2,870,690	2,589,802
Sales Revenue, Goods, Gross									1,118,886	1,780,314	1,145,104
Sales Revenue, Services, Other									259,542	233,239	140,198
Other Revenue, Net									76,666	109,026	141,714
Revenue	382,493	$ 397,065	$ 377,226	$ 298,310	547,237	$ 594,235	$ 482,224	$ 498,883	1,455,094	2,122,579	1,427,016
Costs of products sold									979,549	1,623,358	1,020,100
Operating Costs and Expenses									224,443	246,613	223,585
General and administrative									97,366	87,845	78,597
Depreciation and amortization									100,882	98,397	66,409
Loss (gain) on disposal or impairment of long-lived assets, net	9,993	(951)	1,372	1,058	(11,959)	1,376	19,315	(58)	11,472	32,592	(239)
Costs and Expenses	381,505	376,022	353,921	302,264	542,109	577,312	491,178	478,206	1,413,712	2,088,805	1,388,452
Earnings from equity method investments	20,687	16,237	23,903	20,559	15,827	14,223	19,187	14,962	81,386	64,199	52,477
Gain on issuance of common units by equity method investee	352	136	5,897	0	2,121	18,772	0	8,127	6,385	29,020	26,873
Operating income (loss)	22,027	37,416	53,105	16,605	23,076	49,918	10,233	43,766	129,153	126,993	117,914
Interest Expense									69,675	49,044	25,142
Foreign Currency Transaction Gain (Loss), before Tax									(1,067)	(86)	(1,633)
Other expense (income), net									(15,801)	(20,536)	45,906
Other expenses, net	19,082	17,829	9,809	6,087	(2,196)	(6,368)	29,489	7,497	52,807	28,422	69,415
Income (loss) from continuing operations before income taxes	2,945	19,587	43,296	10,518	25,272	56,286	(19,256)	36,269	76,346	98,571	48,499
Income tax expense (benefit)	3,921	10,006	14,861	4,742	12,569	24,090	(6,672)	16,526	33,530	46,513	(17,254)
Income (Loss) from Continuing Operations Attributable to Parent									42,816	52,058	65,753
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1)	(1)	(2)	0	4	0	0	(5)	(4)	(1)	59
Net income (loss)	(977)	9,580	28,433	5,776	12,707	32,196	(12,584)	19,738	42,812	52,057	65,812
Less: net income attributable to noncontrolling interests	(1,661)	4,707	5,136	4,310	4,633	6,934	5,025	6,150	12,492	22,817	17,710
Net income (loss) attributable to SemGroup	684	$ 4,873	$ 23,297	$ 1,466	8,074	$ 25,262	$ (17,609)	$ 13,588	30,320	29,240	48,102
Other Comprehensive Income (Loss), Net of Tax									(31,421)	(24,287)	(1,555)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									11,391	27,770	64,257
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest									12,492	22,817	17,710
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(1,101)	4,953	46,547
Net Cash Provided by (Used in) Operating Activities									181,762	181,658	173,409
Capital expenditures									(479,530)	(270,506)	(215,609)
Proceeds from sale of long-lived assets									3,688	4,445	1,279
Investments in non-consolidated subsidiaries									(46,730)	(71,131)	(173,868)
Payments to acquire businesses									0	(44,508)	(362,456)
Proceeds from the sale of SemStream assets											0
Proceeds from Sale of Equity Method Investments									56,318	79,741	0
Distributions from equity method investments in excess of equity in earnings									24,113	11,734	12,246
Net cash provided by (used in) investing activities									(442,141)	(290,225)	(738,408)
Payments of Debt Issuance Costs									(6,289)	(8,686)	(14,936)
Proceeds from Issuance of Long-term Debt and Capital Securities, Net									867,208	1,254,244	1,268,474
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities									(560,049)	(1,102,272)	(859,412)
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs									89,119	0	210,226
Distributions to noncontrolling interests									(40,410)	(28,494)	(17,647)
Proceeds from warrant exercises									0	1,451	225
Repurchase of common stock									(4,261)	(719)	(371)
Dividends paid									(69,514)	(44,206)	(25,429)
Intercompany payments and receipts									0	0	0
Net cash provided by (used in) financing activities									277,027	73,308	561,130
Effect of exchange rate changes on cash and cash equivalents									850	(3,494)	3,191
Cash and Cash Equivalents, Period Increase (Decrease)									17,498	(38,753)	(678)
Proceeds from the sale of equity method investments 2									0	0
Proceeds from issuance of common stock under employee stock purchase plan									1,223	340	0
Excess tax benefit from equity-based awards									0	1,650	0
Parent Company [Member]
Cash and cash equivalents	4,559				9,254				4,559	9,254	2,545	19,123
Restricted cash	0				3,856				0	3,856
Accounts Receivable, net	640				9,669				640	9,669
Receivable from affiliates	1,616				2,512				1,616	2,512
Inventories	0				0				0	0
Other current assets	8,477				10,498				8,477	10,498
Total current assets	15,292				35,789				15,292	35,789
Property, plant and equipment	4,335				4,112				4,335	4,112
Equity method investments	1,546,853				1,551,825				1,546,853	1,551,825
Goodwill	0				0				0	0
Other intangible assets	20				26				20	26
Other noncurrent assets	43,898				24,555				43,898	24,555
Total assets	1,610,398				1,616,307				1,610,398	1,616,307
Accounts payable	734				649				734	649
Due to Related Parties, Current	78				21				78	21
Accrued liabilities	5,551				11,993				5,551	11,993
Payables to pre-petition creditors					3,129					3,129
Deferred revenue	0				0				0	0
Other Liabilities, Current	569								569
Other Liabilities, Current					224					224
Current portion of long-term debt	0				0				0	0
Total current liabilities	6,932				16,016				6,932	16,016
Long-term debt	330,000				335,000				330,000	335,000
Deferred income taxes	155,411				112,897				155,411	112,897
Other noncurrent liabilities	2,528				2,886				2,528	2,886
Stockholders' Equity Attributable to Parent	1,115,527				1,149,508				1,115,527	1,149,508
Noncontrolling interests in consolidated subsidiaries	0				0				0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,115,527				1,149,508				1,115,527	1,149,508
Liabilities and Equity	1,610,398				1,616,307				1,610,398	1,616,307
Sales Revenue, Goods, Gross									0	0	0
Sales Revenue, Services, Other									0	0	0
Other Revenue, Net									0	0	0
Revenue									0	0	0
Costs of products sold									0	0	0
Operating Costs and Expenses									0	0	0
General and administrative									29,914	22,394	21,560
Depreciation and amortization									1,522	1,678	2,001
Loss (gain) on disposal or impairment of long-lived assets, net									0	5,945	0
Costs and Expenses									31,436	30,017	23,561
Earnings from equity method investments									65,513	48,760	67,965
Gain on issuance of common units by equity method investee									6,385	29,020	26,873
Operating income (loss)									40,462	47,763	71,277
Interest Expense									2,230	8,423	4,826
Foreign Currency Transaction Gain (Loss), before Tax									(5)	0	0
Other expense (income), net									(16,565)	(24,092)	40,928
Other expenses, net									(14,340)	(15,669)	45,754
Income (loss) from continuing operations before income taxes									54,802	63,432	25,523
Income tax expense (benefit)									24,482	34,192	(22,579)
Income (Loss) from Continuing Operations Attributable to Parent									30,320	29,240	48,102
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0	0	0
Net income (loss)									30,320	29,240	48,102
Net income (loss) attributable to SemGroup									30,320	29,240	48,102
Other Comprehensive Income (Loss), Net of Tax									17,420	5,159	(1,517)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									47,740	34,399	46,585
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest									0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									47,740	34,399	46,585
Net Cash Provided by (Used in) Operating Activities									37,259	27,393	20,130
Capital expenditures									(1,740)	(1,672)	(734)
Proceeds from sale of long-lived assets									0	0	23
Investments in non-consolidated subsidiaries									0	0	(18,775)
Payments to acquire businesses										0	0
Proceeds from the sale of SemStream assets											362,600
Proceeds from Sale of Equity Method Investments									56,318	79,741
Distributions from equity method investments in excess of equity in earnings									35,340	1,843	0
Net cash provided by (used in) investing activities									341,099	194,324	343,114
Payments of Debt Issuance Costs									(601)	(93)	(10,866)
Proceeds from Issuance of Long-term Debt and Capital Securities, Net									181,000	405,500	706,000
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities									(186,000)	(440,500)	(537,500)
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs									0		0
Distributions to noncontrolling interests									0	0	0
Proceeds from warrant exercises										1,451	225
Repurchase of common stock									(4,261)	(719)	(371)
Dividends paid									(69,514)	(44,206)	(25,429)
Intercompany payments and receipts									(304,900)	(138,431)	(511,881)
Net cash provided by (used in) financing activities									(383,053)	(215,008)	(379,822)
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)									(4,695)	6,709	(16,578)
Proceeds from the sale of equity method investments 2									251,181	114,412
Proceeds from issuance of common stock under employee stock purchase plan									1,223	340
Excess tax benefit from equity-based awards										1,650
Guarantor Subsidiaries [Member]
Cash and cash equivalents	0				0				0	0	0	0
Restricted cash	0				0				0	0
Accounts Receivable, net	20,015				32,056				20,015	32,056
Receivable from affiliates	1,119				6,624				1,119	6,624
Inventories	(48)				248				(48)	248
Other current assets	359				575				359	575
Total current assets	21,445				39,503				21,445	39,503
Property, plant and equipment	536,628				452,352				536,628	452,352
Equity method investments	426,801				348,115				426,801	348,115
Goodwill	13,052				13,052				13,052	13,052
Other intangible assets	144,183				152,383				144,183	152,383
Other noncurrent assets	881				958				881	958
Total assets	1,142,990				1,006,363				1,142,990	1,006,363
Accounts payable	11,221				22,097				11,221	22,097
Due to Related Parties, Current	155				7				155	7
Accrued liabilities	10,957				17,575				10,957	17,575
Payables to pre-petition creditors					0					0
Deferred revenue	0				0				0	0
Other Liabilities, Current	0								0
Other Liabilities, Current					707					707
Current portion of long-term debt	0				0				0	0
Total current liabilities	22,333				40,386				22,333	40,386
Long-term debt	7,340				0				7,340	0
Deferred income taxes	0				0				0	0
Other noncurrent liabilities	0				0				0	0
Stockholders' Equity Attributable to Parent	1,113,317				965,977				1,113,317	965,977
Noncontrolling interests in consolidated subsidiaries	0				0				0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,113,317				965,977				1,113,317	965,977
Liabilities and Equity	1,142,990				1,006,363				1,142,990	1,006,363
Sales Revenue, Goods, Gross									190,900	338,621	224,072
Sales Revenue, Services, Other									58,690	37,139	3,192
Other Revenue, Net									0	0	0
Revenue									249,590	375,760	227,264
Costs of products sold									142,576	273,309	166,735
Operating Costs and Expenses									34,407	32,132	19,792
General and administrative									9,935	9,328	9,167
Depreciation and amortization									31,395	25,714	13,909
Loss (gain) on disposal or impairment of long-lived assets, net									142	54,698	668
Costs and Expenses									218,455	395,181	210,271
Earnings from equity method investments									47,352	71,786	49,825
Gain on issuance of common units by equity method investee									0	0	0
Operating income (loss)									78,487	52,365	66,818
Interest Expense									26,476	9,265	9,700
Foreign Currency Transaction Gain (Loss), before Tax									0	0	0
Other expense (income), net									0	500	0
Other expenses, net									26,476	9,765	9,700
Income (loss) from continuing operations before income taxes									52,011	42,600	57,118
Income tax expense (benefit)									0	0	0
Income (Loss) from Continuing Operations Attributable to Parent									52,011	42,600	57,118
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									(3)	0	65
Net income (loss)									52,008	42,600	57,183
Net income (loss) attributable to SemGroup									52,008	42,600	57,183
Other Comprehensive Income (Loss), Net of Tax									430	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									52,438	42,600	57,183
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest									0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									52,438	42,600	57,183
Net Cash Provided by (Used in) Operating Activities									39,786	57,976	23,230
Capital expenditures									(110,729)	(155,392)	(96,909)
Proceeds from sale of long-lived assets									35	2,368	19
Investments in non-consolidated subsidiaries									0	0	0
Payments to acquire businesses										(514)	(313,487)
Proceeds from the sale of SemStream assets											0
Proceeds from Sale of Equity Method Investments									0	0
Distributions from equity method investments in excess of equity in earnings									0	0	0
Net cash provided by (used in) investing activities									(110,694)	(153,538)	(410,377)
Payments of Debt Issuance Costs									0	0	0
Proceeds from Issuance of Long-term Debt and Capital Securities, Net									0	0	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities									0	0	0
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs									0		0
Distributions to noncontrolling interests									0	0	0
Proceeds from warrant exercises										0	0
Repurchase of common stock									0	0	0
Dividends paid									0	0	0
Intercompany payments and receipts									70,908	95,562	387,147
Net cash provided by (used in) financing activities									70,908	95,562	387,147
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)									0	0	0
Proceeds from the sale of equity method investments 2									0	0
Proceeds from issuance of common stock under employee stock purchase plan									0	0
Excess tax benefit from equity-based awards										0
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	55,101				35,445				55,101	35,445	78,342	63,844
Restricted cash	32				3,124				32	3,124
Accounts Receivable, net	306,058				309,609				306,058	309,609
Receivable from affiliates	6,141				15,659				6,141	15,659
Inventories	70,287				43,284				70,287	43,284
Other current assets	10,551				8,944				10,551	8,944
Total current assets	448,170				416,065				448,170	416,065
Property, plant and equipment	1,025,858				800,361				1,025,858	800,361
Equity method investments	438,291				415,673				438,291	415,673
Goodwill	34,980				45,274				34,980	45,274
Other intangible assets	18,020				20,656				18,020	20,656
Other noncurrent assets	17,376				18,873				17,376	18,873
Total assets	1,982,695				1,716,902				1,982,695	1,716,902
Accounts payable	261,711				234,431				261,711	234,431
Due to Related Parties, Current	7,762				21,406				7,762	21,406
Accrued liabilities	68,534				63,126				68,534	63,126
Payables to pre-petition creditors					0					0
Deferred revenue	11,349				23,688				11,349	23,688
Other Liabilities, Current	1,332								1,332
Other Liabilities, Current					543					543
Current portion of long-term debt	31				40				31	40
Total current liabilities	350,719				343,234				350,719	343,234
Long-term debt	761,097				490,946				761,097	490,946
Deferred income taxes	45,542				49,059				45,542	49,059
Other noncurrent liabilities	19,229				46,769				19,229	46,769
Stockholders' Equity Attributable to Parent	725,279				716,965				725,279	716,965
Noncontrolling interests in consolidated subsidiaries	80,829				69,929				80,829	69,929
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	806,108				786,894				806,108	786,894
Liabilities and Equity	1,982,695				1,716,902				1,982,695	1,716,902
Sales Revenue, Goods, Gross									948,576	1,479,543	944,984
Sales Revenue, Services, Other									200,852	196,100	137,006
Other Revenue, Net									76,666	109,026	141,714
Revenue									1,226,094	1,784,669	1,223,704
Costs of products sold									857,563	1,387,899	877,317
Operating Costs and Expenses									190,036	214,481	203,793
General and administrative									57,517	56,123	47,870
Depreciation and amortization									67,965	71,005	50,499
Loss (gain) on disposal or impairment of long-lived assets, net									11,330	(28,051)	(907)
Costs and Expenses									1,184,411	1,701,457	1,178,572
Earnings from equity method investments									76,355	54,098	44,099
Gain on issuance of common units by equity method investee									0	0	0
Operating income (loss)									118,038	137,310	89,231
Interest Expense									42,926	34,661	16,028
Foreign Currency Transaction Gain (Loss), before Tax									(1,062)	(86)	(1,633)
Other expense (income), net									(1,193)	(249)	(434)
Other expenses, net									40,671	34,326	13,961
Income (loss) from continuing operations before income taxes									77,367	102,984	75,270
Income tax expense (benefit)									9,048	12,321	5,325
Income (Loss) from Continuing Operations Attributable to Parent									68,319	90,663	69,945
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									(1)	(1)	(6)
Net income (loss)									68,318	90,662	69,939
Less: net income attributable to noncontrolling interests									12,492	22,817	17,710
Net income (loss) attributable to SemGroup									55,826	67,845	52,229
Other Comprehensive Income (Loss), Net of Tax									(49,271)	(29,446)	(38)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									19,047	61,216	69,901
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest									12,492	22,817	17,710
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									6,555	38,399	52,191
Net Cash Provided by (Used in) Operating Activities									141,899	186,578	150,284
Capital expenditures									(367,061)	(113,442)	(117,966)
Proceeds from sale of long-lived assets									3,653	2,077	1,237
Investments in non-consolidated subsidiaries									(46,730)	(71,131)	(155,093)
Payments to acquire businesses										(43,994)	(48,969)
Proceeds from the sale of SemStream assets											0
Proceeds from Sale of Equity Method Investments									0	0
Distributions from equity method investments in excess of equity in earnings									24,113	11,734	12,246
Net cash provided by (used in) investing activities									(386,025)	(214,756)	(308,545)
Payments of Debt Issuance Costs									(5,688)	(8,593)	(4,070)
Proceeds from Issuance of Long-term Debt and Capital Securities, Net									686,208	848,744	562,474
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities									(374,049)	(661,772)	(321,912)
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs									89,119		210,226
Distributions to noncontrolling interests									(40,410)	(28,494)	(17,647)
Proceeds from warrant exercises										0	0
Repurchase of common stock									0	0	0
Dividends paid									0	0	0
Intercompany payments and receipts									(92,248)	(161,110)	(259,503)
Net cash provided by (used in) financing activities									262,932	(11,225)	169,568
Effect of exchange rate changes on cash and cash equivalents									850	(3,494)	3,191
Cash and Cash Equivalents, Period Increase (Decrease)									19,656	(42,897)	14,498
Proceeds from the sale of equity method investments 2									0	0
Proceeds from issuance of common stock under employee stock purchase plan									0	0
Excess tax benefit from equity-based awards										0
Consolidation, Eliminations [Member]
Cash and cash equivalents	(1,564)				(4,101)				(1,564)	(4,101)	(1,536)	$ (2,938)
Restricted cash	0				0				0	0
Accounts Receivable, net	0				0				0	0
Receivable from affiliates	(2,962)				(7,976)				(2,962)	(7,976)
Inventories	0				0				0	0
Other current assets	0				0				0	0
Total current assets	(4,526)				(12,077)				(4,526)	(12,077)
Property, plant and equipment	0				0				0	0
Equity method investments	(1,860,867)				(1,737,693)				(1,860,867)	(1,737,693)
Goodwill	0				0				0	0
Other intangible assets	0				0				0	0
Other noncurrent assets	0				0				0	0
Total assets	(1,865,393)				(1,749,770)				(1,865,393)	(1,749,770)
Accounts payable	0				0				0	0
Due to Related Parties, Current	(2,962)				(7,974)				(2,962)	(7,974)
Accrued liabilities	5				0				5	0
Payables to pre-petition creditors					0					0
Deferred revenue	0				0				0	0
Other Liabilities, Current	0								0
Other Liabilities, Current					0					0
Current portion of long-term debt	0				0				0	0
Total current liabilities	(2,957)				(7,974)				(2,957)	(7,974)
Long-term debt	(23,840)				(58,854)				(23,840)	(58,854)
Deferred income taxes	0				0				0	0
Other noncurrent liabilities	0				0				0	0
Stockholders' Equity Attributable to Parent	(1,838,596)				(1,682,942)				(1,838,596)	(1,682,942)
Noncontrolling interests in consolidated subsidiaries	0				0				0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,838,596)				(1,682,942)				(1,838,596)	(1,682,942)
Liabilities and Equity	$ (1,865,393)				$ (1,749,770)				(1,865,393)	(1,749,770)
Sales Revenue, Goods, Gross									(20,590)	(37,850)	(23,952)
Sales Revenue, Services, Other									0	0	0
Other Revenue, Net									0	0	0
Revenue									(20,590)	(37,850)	(23,952)
Costs of products sold									(20,590)	(37,850)	(23,952)
Operating Costs and Expenses									0	0	0
General and administrative									0	0	0
Depreciation and amortization									0	0	0
Loss (gain) on disposal or impairment of long-lived assets, net									0	0	0
Costs and Expenses									(20,590)	(37,850)	(23,952)
Earnings from equity method investments									(107,834)	(110,445)	(109,412)
Gain on issuance of common units by equity method investee									0	0	0
Operating income (loss)									(107,834)	(110,445)	(109,412)
Interest Expense									(1,957)	(3,305)	(5,412)
Foreign Currency Transaction Gain (Loss), before Tax									0	0	0
Other expense (income), net									1,957	3,305	5,412
Other expenses, net									0	0	0
Income (loss) from continuing operations before income taxes									(107,834)	(110,445)	(109,412)
Income tax expense (benefit)									0	0	0
Income (Loss) from Continuing Operations Attributable to Parent									(107,834)	(110,445)	(109,412)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0	0	0
Net income (loss)									(107,834)	(110,445)	(109,412)
Net income (loss) attributable to SemGroup									(107,834)	(110,445)	(109,412)
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(107,834)	(110,445)	(109,412)
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest									0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(107,834)	(110,445)	(109,412)
Net Cash Provided by (Used in) Operating Activities									(37,182)	(90,289)	(20,235)
Capital expenditures									0	0	0
Proceeds from sale of long-lived assets									0	0	0
Investments in non-consolidated subsidiaries									0	0	0
Payments to acquire businesses										0	0
Proceeds from the sale of SemStream assets											(362,600)
Proceeds from Sale of Equity Method Investments									0	0
Distributions from equity method investments in excess of equity in earnings									(35,340)	(1,843)	0
Net cash provided by (used in) investing activities									(286,521)	(116,255)	(362,600)
Payments of Debt Issuance Costs									0	0	0
Proceeds from Issuance of Long-term Debt and Capital Securities, Net									0	0	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities									0	0	0
Proceeds from issuance of Rose Rock Midstream, L.P. common units, net of offering costs									0		0
Distributions to noncontrolling interests									0	0	0
Proceeds from warrant exercises										0	0
Repurchase of common stock									0	0	0
Dividends paid									0	0	0
Intercompany payments and receipts									326,240	203,979	384,237
Net cash provided by (used in) financing activities									326,240	203,979	384,237
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)									2,537	(2,565)	$ 1,402
Proceeds from the sale of equity method investments 2									(251,181)	(114,412)
Proceeds from issuance of common stock under employee stock purchase plan									$ 0	0
Excess tax benefit from equity-based awards										$ 0

Condensed Consolidating Guar123

Condensed Consolidating Guarantor Financial Statements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Senior notes	$ 300,000
Corporate Segment [Member]
Senior notes	$ 300,000	$ 300,000
Senior Notes [Member]
Debt instrument, interest rate stated percentage	7.50%
Senior Notes [Member] | Corporate Segment [Member]
Debt instrument, interest rate stated percentage	7.50%