XML 18 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating loss carryforwards, expiration starting date Dec. 31, 2035    
Income taxes receivable $ 43,800,000us-gaap_IncomeTaxReceivable $ 0us-gaap_IncomeTaxReceivable  
Income taxes payable 0us-gaap_AccruedIncomeTaxes 0us-gaap_AccruedIncomeTaxes  
Cash settlement from ONEOK 3,800,000ogs_CashsettlementfromONEOK    
Net operating loss 8,100,000us-gaap_OperatingLossCarryforwards    
Current income tax provision (benefit)      
Federal 17,006,000us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit
State 1,397,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 67,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 360,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income tax provision (benefit) 18,403,000us-gaap_CurrentIncomeTaxExpenseBenefit 67,000us-gaap_CurrentIncomeTaxExpenseBenefit 360,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax provision      
Federal 42,024,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 53,562,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 51,481,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 7,911,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8,643,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8,010,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax provision 49,935,000us-gaap_DeferredIncomeTaxExpenseBenefit 62,205,000us-gaap_DeferredIncomeTaxExpenseBenefit 59,491,000us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Reconciliation [Abstract]      
Income before income taxes 178,128,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 161,467,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 156,360,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision for federal income taxes 62,345,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 56,513,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 54,726,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 6,051,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 5,661,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 5,423,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net (58,000)us-gaap_IncomeTaxReconciliationOtherAdjustments 98,000us-gaap_IncomeTaxReconciliationOtherAdjustments (298,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision 68,338,000us-gaap_IncomeTaxExpenseBenefit 62,272,000us-gaap_IncomeTaxExpenseBenefit 59,851,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets      
Deferred tax assets, employee benefits and other accrued liabilities 128,715,000ogs_Deferredtaxassetemployeebenefitsandotheraccruedliabilities 0ogs_Deferredtaxassetemployeebenefitsandotheraccruedliabilities  
Net operating loss 8,144,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 40,125,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other 5,655,000us-gaap_DeferredTaxAssetsOther 8,249,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 142,514,000us-gaap_DeferredTaxAssetsGross 48,374,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities      
Excess of tax over book depreciation 820,853,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 750,305,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Purchased-gas cost adjustment 16,177,000us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities 4,695,000us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities  
Other regulatory assets and liabilities, net 193,159,000us-gaap_DeferredTaxLiabilitiesOther 2,563,000us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities 1,030,189,000us-gaap_DeferredIncomeTaxLiabilities 757,563,000us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liabilities $ 887,675,000us-gaap_DeferredTaxLiabilities $ 709,189,000us-gaap_DeferredTaxLiabilities