STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 109,790us-gaap_NetIncomeLoss	$ 99,195us-gaap_NetIncomeLoss	$ 96,509us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	125,722	144,758	130,150
Deferred income taxes	49,935us-gaap_DeferredIncomeTaxExpenseBenefit	62,205us-gaap_DeferredIncomeTaxExpenseBenefit	59,491us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based Compensation	7,613us-gaap_ShareBasedCompensation	0us-gaap_ShareBasedCompensation	0us-gaap_ShareBasedCompensation
Provision for doubtful accounts	7,195us-gaap_ProvisionForDoubtfulAccounts	5,460us-gaap_ProvisionForDoubtfulAccounts	2,528us-gaap_ProvisionForDoubtfulAccounts
Changes in assets and liabilities:
Accounts receivable	23,044us-gaap_IncreaseDecreaseInReceivables	(102,142)us-gaap_IncreaseDecreaseInReceivables	10,016us-gaap_IncreaseDecreaseInReceivables
Income Tax Receivable	(43,800)	0	0
Natural gas in storage	(19,172)us-gaap_IncreaseDecreaseInInventories	(63,139)us-gaap_IncreaseDecreaseInInventories	30,154us-gaap_IncreaseDecreaseInInventories
Asset removal costs	(47,125)us-gaap_PaymentsForRemovalCosts	(46,567)us-gaap_PaymentsForRemovalCosts	(47,658)us-gaap_PaymentsForRemovalCosts
Affiliate payable	0	(8,140)	(7,229)
Accounts payable	(6,881)	37,241	(3,950)
Accrued taxes other than income	12,316	2,449	174
Accrued Liabilities	21,228	(5,443)	(4,511)
Customer deposits	2,643	(727)	(1,254)
Regulatory assets and liabilities	30,067	29,436	(59,338)
Employee benefit obligation	(10,102)	0	0
Other assets and liabilities	(15,810)	(378)	(8,495)
Cash provided by operating activities	246,663	154,208	196,587
Investing activities
Capital expenditures	(297,103)	(292,080)	(272,014)
Proceeds from sale of assets	0	1,327	1,462
Cash used in investing activities	(297,103)	(290,753)	(270,552)
Financing activities
Settlement of short-term notes payable to ONEOK, net	0	150,851	58,692
Borrowings on notes payable, net	42,000	0	0
Issuance of debt, net of discounts	1,199,994	0	0
Long-term debt financing costs	(11,087)us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts
Borrowings on long-term line of credit with ONEOK	0	0	115,235
Cash payment to ONEOK upon separation	(1,130,000)ogs_CashpaymenttoONEOKuponseparation	0ogs_CashpaymenttoONEOKuponseparation	0ogs_CashpaymenttoONEOKuponseparation
Issuance of common stock	2,001	0	0
Dividends paid	(43,696)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Repayment of long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(206)us-gaap_RepaymentsOfLongTermDebt	(330)us-gaap_RepaymentsOfLongTermDebt
Distributions to ONEOK	0us-gaap_PaymentsOfCapitalDistribution	(14,969)us-gaap_PaymentsOfCapitalDistribution	(100,067)us-gaap_PaymentsOfCapitalDistribution
Cash provided by financing activities	59,212	135,676	73,530
Change in cash and cash equivalents	8,772	(869)	(435)
Cash and cash equivalents at beginning of period	3,171	4,040	4,475
Cash and cash equivalents at end of period	11,943	3,171	4,040
Supplemental cash flow information:
Cash paid for interest, net of amounts capitalized	21,066us-gaap_InterestPaid	0us-gaap_InterestPaid	0us-gaap_InterestPaid
Cash paid to ONEOK for interest, net of amounts capitalized	0ogs_CashpaidtoONEOKforinterest.	61,366ogs_CashpaidtoONEOKforinterest.	60,793ogs_CashpaidtoONEOKforinterest.
Cash paid for income taxes	44,603us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Cash paid to ONEOK for income taxes	$ 0ogs_CashpaidtoONEOKforincometaxes.	$ 67ogs_CashpaidtoONEOKforincometaxes.	$ 360ogs_CashpaidtoONEOKforincometaxes.

Cash paid to ONEOK for income taxes.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.

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Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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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.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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.

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Amount of operating expense for depreciation and amortization of regulated operation.

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