Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 5,776us-gaap_ProfitLoss	$ 19,738us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Net unrealized loss related to derivative instruments	2,645us-gaap_UnrealizedGainLossOnDerivatives	606us-gaap_UnrealizedGainLossOnDerivatives
Depreciation and amortization	23,734	23,637
Loss (gain) on disposal or impairment of long-lived assets, net	1,058	(58)
Earnings from equity method investments	(20,559)	(14,962)
Gain on issuance of common units by equity method investee	0	(8,127)
Gain on sale of common units of equity method investee	(7,894)	0
Distributions from equity investments	25,879	16,421
Amortization of debt issuance costs	1,066us-gaap_AmortizationOfFinancingCosts	785us-gaap_AmortizationOfFinancingCosts
Deferred tax expense (benefit)	(682)us-gaap_DeferredIncomeTaxExpenseBenefit	10,518us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash equity compensation	2,777us-gaap_ShareBasedCompensation	2,330us-gaap_ShareBasedCompensation
Excess tax benefit from equity-based awards	0	(1,650)
Gain on fair value of warrants	0us-gaap_FairValueAdjustmentOfWarrants	(980)us-gaap_FairValueAdjustmentOfWarrants
Provision for uncollectible accounts receivable, net of recoveries	383us-gaap_ProvisionForDoubtfulAccounts	(129)us-gaap_ProvisionForDoubtfulAccounts
Currency gain	(519)	(683)
Inventory valuation adjustment	1,187us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Changes in operating assets and liabilities (Note 12)	(16,307)	(18,548)
Net cash provided by operating activities	18,544	28,898
Cash flows from investing activities:
Capital expenditures	(84,327)	(56,753)
Proceeds from sale of long-lived assets	117	695
Proceeds from the sale of Wattenberg Holding, LLC and Glass Mountain Holding, LLC to Rose Rock Midstream L.P.	0
Contributions to equity method investments	(15,182)	(24,251)
Proceeds from sale of common units of equity method investee	29,012	0
Distributions in excess of equity in earnings of affiliates	5,201	2,505
Net cash used in investing activities	(65,179)	(77,804)
Cash flows from financing activities:
Debt issuance costs	(601)us-gaap_PaymentsOfDebtIssuanceCosts	(155)us-gaap_PaymentsOfDebtIssuanceCosts
Borrowings on credit facilities	422,000	186,000
Principal payments on credit facilities and other obligations	(162,012)	(128,509)
Rose Rock Midstream, L.P. equity issuance	89,119	0
Distributions to noncontrolling interests	(8,953)	(6,398)
Repurchase of common stock for payment of statutory taxes due on equity-based compensation	(3,630)	(719)
Dividends paid	(14,846)us-gaap_PaymentsOfDividendsCommonStock	(9,382)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of common stock under employee stock purchase plan	313	88
Excess tax benefit from equity-based awards	0	1,650
Intercompany borrowings (advances), net	0semg_Intercompanypaymentsandreceipts	0semg_Intercompanypaymentsandreceipts
Net cash provided by financing activities	321,390	42,575
Effect of exchange rate changes on cash and cash equivalents	172	1,938
Change in cash and cash equivalents	274,927	(4,393)
Cash and cash equivalents at beginning of period	40,598	79,351
Cash and cash equivalents at end of period	$ 315,525	$ 74,958

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The cash inflow from the issuance of common limited partners units during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

+ Details

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

+ References

No definition available.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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