STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 60,381us-gaap_NetIncomeLoss	$ 59,076us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,630	31,460
Deferred income taxes	10,460us-gaap_DeferredIncomeTaxExpenseBenefit	152us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expense	2,484us-gaap_ShareBasedCompensation	1,794us-gaap_ShareBasedCompensation
Provision for doubtful accounts	896us-gaap_ProvisionForDoubtfulAccounts	891us-gaap_ProvisionForDoubtfulAccounts
Changes in assets and liabilities:
Accounts receivable	17,003us-gaap_IncreaseDecreaseInReceivables	(42,712)us-gaap_IncreaseDecreaseInReceivables
Income tax receivable	38,210	0
Natural gas in storage	104,023us-gaap_IncreaseDecreaseInInventories	84,474us-gaap_IncreaseDecreaseInInventories
Asset removal costs	(8,168)us-gaap_PaymentsForRemovalCosts	(8,107)us-gaap_PaymentsForRemovalCosts
Accounts payable	(53,777)	6,091
Current income taxes payable	0	18,965
Accrued taxes other than income	3,117	24,125
Accrued liabilities	(12,371)	10,363
Customer deposits	853	1,424
Regulatory assets and liabilities	63,434	11,066
Other assets and liabilities	(17,085)	(16,964)
Cash provided by operating activities	241,090	182,098
Investing activities
Capital expenditures	(54,914)	(65,731)
Cash used in investing activities	(54,914)	(65,731)
Financing activities
Repayments on notes payable, net	(42,000)	0
Issuance of debt, net of discounts	0	1,199,994
Long-term debt financing costs	0us-gaap_PaymentsOfFinancingCosts	(10,903)us-gaap_PaymentsOfFinancingCosts
Cash Payment to ONEOK Upon Separation	0ogs_CashpaymenttoONEOKuponseparation	(1,130,000)ogs_CashpaymenttoONEOKuponseparation
Issuance of common stock	2,156	17
Dividends paid	(15,773)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Cash provided by (used in) financing activities	(55,617)	59,108
Change in cash and cash equivalents	130,559	175,475
Cash and cash equivalents at beginning of period	11,943	3,171
Cash and cash equivalents at end of period	$ 142,502	$ 178,646

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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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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the 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. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The increase (decrease) during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement.

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The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Cash outflow related to disposal costs of plants, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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

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