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BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, plant and equipment    
Property, plant and equipment $ 4,850,201us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService $ 4,534,074us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Accumulated depreciation and amortization 1,556,481us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation 1,489,216us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Net property, plant and equipment (Note 10) 3,293,720us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 3,044,858us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Current assets    
Cash and cash equivalents 11,943us-gaap_CashAndCashEquivalentsAtCarryingValue 3,171us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 326,749us-gaap_ReceivablesNetCurrent 356,988us-gaap_ReceivablesNetCurrent
Income tax receivable 43,800us-gaap_IncomeTaxReceivable 0us-gaap_IncomeTaxReceivable
Natural gas in storage 185,300us-gaap_PublicUtilitiesInventory 166,128us-gaap_PublicUtilitiesInventory
Regulatory assets (Note 9) 50,193us-gaap_RegulatoryAssetsCurrent 21,657us-gaap_RegulatoryAssetsCurrent
Other current assets 49,516us-gaap_OtherAssetsCurrent 54,240us-gaap_OtherAssetsCurrent
Total current assets 667,501us-gaap_AssetsCurrent 602,184us-gaap_AssetsCurrent
Goodwill and other assets    
Regulatory assets (Note 9) 478,723us-gaap_RegulatoryAssetsNoncurrent 23,822us-gaap_RegulatoryAssetsNoncurrent
Goodwill 157,953us-gaap_Goodwill 157,953us-gaap_Goodwill
Other assets 51,313us-gaap_OtherAssetsNoncurrent 17,658us-gaap_OtherAssetsNoncurrent
Total goodwill and other assets 687,989ogs_Totalgoodwillandotherassets 199,433ogs_Totalgoodwillandotherassets
Total assets 4,649,210us-gaap_Assets 3,846,475us-gaap_Assets
Equity and long-term debt    
Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 52,083,859 shares at December 31, 2014; authorized 1,000 shares, issued and outstanding 100 shares at December 31, 2013 521us-gaap_CommonStockValue 0us-gaap_CommonStockValue
Paid-in capital 1,758,796us-gaap_AdditionalPaidInCapital 0us-gaap_AdditionalPaidInCapital
Retained earnings 39,894us-gaap_RetainedEarningsAccumulatedDeficit 0us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (loss) (5,174)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Owner's net investment 0ogs_Ownersnetinvestment 1,239,023ogs_Ownersnetinvestment
Total equity 1,794,037us-gaap_StockholdersEquity 1,239,023us-gaap_StockholdersEquity
Long-term debt, excluding current maturities 1,201,311us-gaap_LongTermDebtNoncurrent 1,318us-gaap_LongTermDebtNoncurrent
Long-term line of credit with ONEOK 0us-gaap_NotesPayableRelatedPartiesNoncurrent 1,027,631us-gaap_NotesPayableRelatedPartiesNoncurrent
Total equity and long-term debt 2,995,348us-gaap_CapitalizationLongtermDebtAndEquity 2,267,972us-gaap_CapitalizationLongtermDebtAndEquity
Current liabilities    
Current maturities of long-term debt 6us-gaap_LongTermDebtCurrent 6us-gaap_LongTermDebtCurrent
Notes payable 42,000us-gaap_CommercialPaper 0us-gaap_CommercialPaper
Short-term note payable to ONEOK 0us-gaap_NotesPayableRelatedPartiesClassifiedCurrent 444,960us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Affiliate payables 0us-gaap_DueToAffiliateCurrent 22,403us-gaap_DueToAffiliateCurrent
Accounts payable 159,064us-gaap_AccountsPayableCurrent 169,500us-gaap_AccountsPayableCurrent
Accrued taxes other than income 44,742us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 32,426us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Accrued liabilities 26,019us-gaap_AccruedLiabilitiesCurrent 4,791us-gaap_AccruedLiabilitiesCurrent
Customer deposits 60,003us-gaap_CustomerDepositsCurrent 57,360us-gaap_CustomerDepositsCurrent
Regulatory liability, current 32,467us-gaap_RegulatoryLiabilityCurrent 17,796us-gaap_RegulatoryLiabilityCurrent
Other current liabilities 28,132us-gaap_OtherLiabilitiesCurrent 19,835us-gaap_OtherLiabilitiesCurrent
Total current liabilities 392,433us-gaap_LiabilitiesCurrent 769,077us-gaap_LiabilitiesCurrent
Deferred credits and other liabilities [Abstract]    
Deferred income taxes 894,585us-gaap_DeferredTaxLiabilitiesNoncurrent 743,452us-gaap_DeferredTaxLiabilitiesNoncurrent
Employee benefit obligations 287,779us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 0us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Other deferred credits 79,065us-gaap_OtherLiabilitiesNoncurrent 65,974us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other liabilities 1,261,429ogs_TotalDeferredCreditsAndOtherLiabilities 809,426ogs_TotalDeferredCreditsAndOtherLiabilities
Commitments and contingencies (Note 14)      
Total liabilities and equity $ 4,649,210us-gaap_LiabilitiesAndStockholdersEquity $ 3,846,475us-gaap_LiabilitiesAndStockholdersEquity