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No authoritative reference available. false 2 Operating Revenues 2 us-gaap_UtilityRevenueAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Electric Retail Sales 2 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 259940000 259940 false false false 2 true true false false 267200000 267200 false false false 3 true true false false 464686000 464686 false false false 4 true true false false 468552000 468552 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. No authoritative reference available. false 4 Electric Wholesale Sales 2 us-gaap_SalesRevenueFromEnergyCommoditiesAndServices us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 27174000 27174 false false false 2 false true false false 27950000 27950 false false false 3 false true false false 63319000 63319 false false false 4 false true false false 63246000 63246 false false false xbrli:monetaryItemType monetary Revenue derived from energy-related services such supplying various forms of energy (such as steam, electricity and chilled water from the operation of on-site facilities or cogeneration plants), procurement services provided to energy purchasers, and the marketing and trading of energy commodities and derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 5 California Power Exchange (CPX) Provision for Wholesale Refunds 2 uns_ProvisionForWholesaleRefunds uns false debit duration California Power Exchange (CPX) Provision for Wholesale Refunds. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -2970000 -2970 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary California Power Exchange (CPX) Provision for Wholesale Refunds. No authoritative reference available. false 6 Gas Revenue 2 us-gaap_GasDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 24677000 24677 false false false 2 false true false false 24661000 24661 false false false 3 false true false false 80458000 80458 false false false 4 false true false false 82963000 82963 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of [natural] gas. No authoritative reference available. false 7 Other Revenues 2 us-gaap_OtherSalesRevenueNet us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 26030000 26030 false false false 2 false true false false 17973000 17973 false false false 3 false true false false 50230000 50230 false false false 4 false true false false 34880000 34880 false false false xbrli:monetaryItemType monetary Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 8 Total Operating Revenues 2 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 337821000 337821 false false false 2 false true false false 337784000 337784 false false false 3 false true false false 655723000 655723 false false false 4 false true false false 649641000 649641 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 9 Operating Expenses 2 us-gaap_UtilitiesOperatingExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 10 Fuel 2 us-gaap_UtilitiesOperatingExpenseFuelUsed us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 69246000 69246 false false false 2 false true false false 69047000 69047 false false false 3 false true false false 129694000 129694 false false false 4 false true false false 123864000 123864 false false false xbrli:monetaryItemType monetary The amount of fuel used charged against earnings for the period. 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No authoritative reference available. false 15 Increase (Decrease) to Reflect PPFAC/PGA Recovery Treatment 2 uns_IncreaseDecreaseToReflectPurchasedPowerAndFuelAdjustmentClauseAndPurchasedGasAdjusterRecoveryTreatment uns false credit duration Increase (Decrease) to reflect Purchased Power and Fuel Adjustment Clause and Purchased Gas Adjuster recovery treatment. false false false false false false false false false false true negatedtotal false 1 false true false false -10330000 -10330 false false false 2 false true false false 3618000 3618 false false false 3 false true false false -22962000 -22962 false false false 4 false true false false 10320000 10320 false false false xbrli:monetaryItemType monetary Increase (Decrease) to reflect Purchased Power and Fuel Adjustment Clause and Purchased Gas Adjuster recovery treatment. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 17 Other Operations and Maintenance 2 us-gaap_OtherCostAndExpenseOperating us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 87134000 87134 false false false 2 false true false false 78929000 78929 false false false 3 false true false false 170042000 170042 false false false 4 false true false false 163882000 163882 false false false xbrli:monetaryItemType monetary The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 5 false 18 Depreciation 2 us-gaap_CostOfServicesDepreciation us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 32223000 32223 false false false 2 false true false false 40752000 40752 false false false 3 false true false false 63322000 63322 false false false 4 false true false false 74354000 74354 false false false xbrli:monetaryItemType monetary The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 19 Amortization 2 us-gaap_AdjustmentForAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7048000 7048 false false false 2 false true false false 6775000 6775 false false false 3 false true false false 13620000 13620 false false false 4 false true false false 13848000 13848 false false false xbrli:monetaryItemType monetary The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of intangible assets over their estimated remaining economic lives. No authoritative reference available. false 20 Taxes Other Than Income Taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11952000 11952 false false false 2 false true false false 12363000 12363 false false false 3 false true false false 24225000 24225 false false false 4 false true false false 24818000 24818 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. true 21 Total Operating Expenses 2 us-gaap_UtilitiesOperatingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 265527000 265527 false false false 2 false true false false 278694000 278694 false false false 3 false true false false 530510000 530510 false false false 4 false true false false 557251000 557251 false false false xbrli:monetaryItemType monetary Discloses the total amount of all operating expenses for the period. No authoritative reference available. true 22 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 72294000 72294 false false false 2 false true false false 59090000 59090 false false false 3 false true false false 125213000 125213 false false false 4 false true false false 92390000 92390 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 23 Other Income (Deductions) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 24 Interest Income 2 us-gaap_InvestmentIncomeInterest us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1953000 1953 false false false 2 false true false false 4823000 4823 false false false 3 false true false false 3880000 3880 false false false 4 false true false false 6921000 6921 false false false xbrli:monetaryItemType monetary Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. 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Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 30 Capital Leases 2 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 11425000 11425 false false false 2 false true false false 11450000 11450 false false false 3 false true false false 23509000 23509 false false false 4 false true false false 24258000 24258 false false false xbrli:monetaryItemType monetary The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 6 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 55 -IssueDate 2006-05-01 true 32 Total Interest Expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 27427000 27427 false false false 2 false true false false 26511000 26511 false false false 3 false true false false 55079000 55079 false false false 4 false true false false 53708000 53708 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 35 Net Income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 25540000 25540 false false false 2 false true false false 31275000 31275 false false false 3 false true false false 45513000 45513 false false false 4 false true false false 36194000 36194 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) true 36 Weighted-Average Shares of Common Stock Outstanding (000) 2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 36322000 36322 false false false 2 false true false false 35687000 35687 false false false 3 false true false false 36215000 36215 false false false 4 false true false false 35676000 35676 false false false xbrli:sharesItemType shares Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 true 37 Basic Earnings per Share 2 us-gaap_EarningsPerShareBasic us-gaap true na duration No definition available. false false false false false false false false false false false totallabel true 1 true true false false 0.7 0.7 false false false 2 true true false false 0.88 0.88 false false false 3 true true false false 1.26 1.26 false false false 4 true true false false 1.01 1.01 false false false us-types:perShareItemType decimal The amount of net income or loss for the period per each share of common stock outstanding during the reporting period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 true 40 TUCSON ELECTRIC POWER COMPANY 0 na true na na No definition available. false true false false false false false false false false false http://uns.com/role/statementsofincome false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 5 USD true false false false TUCSON ELECTRIC POWER COMPANY dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false TUCSON ELECTRIC POWER COMPANY dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false TUCSON ELECTRIC POWER COMPANY dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false TUCSON ELECTRIC POWER COMPANY dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SubsidiariesMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 41 Operating Revenues 2 us-gaap_UtilityRevenueAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 42 Electric Retail Sales 2 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 217555000 217555 false false false 2 false true false false 220007000 220007 false false false 3 false true false false 384974000 384974 false false false 4 false true false false 377771000 377771 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. No authoritative reference available. false 43 Electric Wholesale Sales 2 us-gaap_SalesRevenueFromEnergyCommoditiesAndServices us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 27983000 27983 false false false 2 false true false false 31985000 31985 false false false 3 false true false false 68025000 68025 false false false 4 false true false false 69743000 69743 false false false xbrli:monetaryItemType monetary Revenue derived from energy-related services such supplying various forms of energy (such as steam, electricity and chilled water from the operation of on-site facilities or cogeneration plants), procurement services provided to energy purchasers, and the marketing and trading of energy commodities and derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 44 California Power Exchange (CPX) Provision for Wholesale Refunds 2 uns_ProvisionForWholesaleRefunds uns false debit duration California Power Exchange (CPX) Provision for Wholesale Refunds. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -2970000 -2970 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary California Power Exchange (CPX) Provision for Wholesale Refunds. No authoritative reference available. false 46 Other Revenues 2 us-gaap_OtherSalesRevenueNet us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 27864000 27864 false false false 2 false true false false 19552000 19552 false false false 3 false true false false 53507000 53507 false false false 4 false true false false 37303000 37303 false false false xbrli:monetaryItemType monetary Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 47 Total Operating Revenues 2 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 273402000 273402 false false false 2 false true false false 271544000 271544 false false false 3 false true false false 503536000 503536 false false false 4 false true false false 484817000 484817 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 48 Operating Expenses 2 us-gaap_UtilitiesOperatingExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 49 Fuel 2 us-gaap_UtilitiesOperatingExpenseFuelUsed us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 66694000 66694 false false false 2 false true false false 65038000 65038 false false false 3 false true false false 125045000 125045 false false false 4 false true false false 116478000 116478 false false false xbrli:monetaryItemType monetary The amount of fuel used charged against earnings for the period. No authoritative reference available. false 50 Purchased Power 2 us-gaap_UtilitiesOperatingExpensePurchasedPower us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 32122000 32122 false false false 2 false true false false 36375000 36375 false false false 3 false true false false 55857000 55857 false false false 4 false true false false 59417000 59417 false false false xbrli:monetaryItemType monetary The amount of purchased power charged against earnings for the period. No authoritative reference available. false 52 Transmission 2 us-gaap_CostOfTransmission us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1049000 1049 false false false 2 false true false false 1259000 1259 false false false 3 false true false false 1845000 1845 false false false 4 false true false false 1807000 1807 false false false xbrli:monetaryItemType monetary Cost incurred for transmission operations and maintenance by total kilowatt-hours paid to sources. No authoritative reference available. false 53 Decrease to Reflect PPFAC/PGA Recovery Treatment 2 uns_IncreaseDecreaseToReflectPurchasedPowerAndFuelAdjustmentClauseRecoveryTreatment uns false credit duration Increase (Decrease) to reflect Purchased Power and Fuel Adjustment Clause recovery treatment. false false false false false false false false false false true negatedtotal false 1 false true false false -7618000 -7618 false false false 2 false true false false -3634000 -3634 false false false 3 false true false false -10736000 -10736 false false false 4 false true false false -4003000 -4003 false false false xbrli:monetaryItemType monetary Increase (Decrease) to reflect Purchased Power and Fuel Adjustment Clause recovery treatment. No authoritative reference available. true 55 Total Fuel and Purchased Energy 2 us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 92247000 92247 false false false 2 false true false false 99038000 99038 false false false 3 false true false false 172011000 172011 false false false 4 false true false false 173699000 173699 false false false xbrli:monetaryItemType monetary Total costs incurred and are directly related to energy commodities and services provided during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 56 Other Operations and Maintenance 2 us-gaap_OtherCostAndExpenseOperating us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 76143000 76143 false false false 2 false true false false 69103000 69103 false false false 3 false true false false 148165000 148165 false false false 4 false true false false 143837000 143837 false false false xbrli:monetaryItemType monetary The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 5 false 57 Depreciation 2 us-gaap_CostOfServicesDepreciation us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 24893000 24893 false false false 2 false true false false 33775000 33775 false false false 3 false true false false 48953000 48953 false false false 4 false true false false 60532000 60532 false false false xbrli:monetaryItemType monetary The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 58 Amortization 2 us-gaap_AdjustmentForAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 8024000 8024 false false false 2 false true false false 7994000 7994 false false false 3 false true false false 15810000 15810 false false false 4 false true false false 16288000 16288 false false false xbrli:monetaryItemType monetary The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of intangible assets over their estimated remaining economic lives. No authoritative reference available. false 59 Taxes Other Than Income Taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 9779000 9779 false false false 2 false true false false 10040000 10040 false false false 3 false true false false 19778000 19778 false false false 4 false true false false 20295000 20295 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. true 60 Total Operating Expenses 2 us-gaap_UtilitiesOperatingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 211086000 211086 false false false 2 false true false false 219950000 219950 false false false 3 false true false false 404717000 404717 false false false 4 false true false false 414651000 414651 false false false xbrli:monetaryItemType monetary Discloses the total amount of all operating expenses for the period. No authoritative reference available. true 61 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 62316000 62316 false false false 2 false true false false 51594000 51594 false false false 3 false true false false 98819000 98819 false false false 4 false true false false 70166000 70166 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 62 Other Income (Deductions) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 63 Interest Income 2 us-gaap_InvestmentIncomeInterest us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1696000 1696 false false false 2 false true false false 4740000 4740 false false false 3 false true false false 3386000 3386 false false false 4 false true false false 6809000 6809 false false false xbrli:monetaryItemType monetary Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 false 64 Other Income 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1115000 1115 false false false 2 false true false false 7389000 7389 false false false 3 false true false false 2333000 2333 false false false 4 false true false false 7977000 7977 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 65 Other Expense 2 us-gaap_OtherNonoperatingExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negatedtotal false 1 false true false false -818000 -818 false false false 2 false true false false -521000 -521 false false false 3 false true false false -1598000 -1598 false false false 4 false true false false -906000 -906 false false false xbrli:monetaryItemType monetary Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 true 66 Total Other Income (Deductions) 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1993000 1993 false false false 2 false true false false 11608000 11608 false false false 3 false true false false 4121000 4121 false false false 4 false true false false 13880000 13880 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 true 67 Interest Expense 2 us-gaap_InterestAndDebtExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 68 Long-Term Debt 2 us-gaap_InterestExpenseDebt us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 10154000 10154 false false false 2 false true false false 9213000 9213 false false false 3 false true false false 20032000 20032 false false false 4 false true false false 18404000 18404 false false false xbrli:monetaryItemType monetary Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 false 69 Capital Leases 2 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 11423000 11423 false false false 2 false true false false 11446000 11446 false false false 3 false true false false 23504000 23504 false false false 4 false true false false 24251000 24251 false false false xbrli:monetaryItemType monetary The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 12 false 70 Other Interest Expense, Net of Interest Capitalized 2 us-gaap_InterestExpenseOther us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 68000 68 false false false 2 false true false false -163000 -163 false false false 3 false true false false 42000 42 false false false 4 false true false false -449000 -449 false false false xbrli:monetaryItemType monetary Interest expense on all other items not previously classified. For example, includes dividends associated with redeemable preferred stock of a subsidiary that is treated as a liability in the parent's consolidated balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 6 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 55 -IssueDate 2006-05-01 true 71 Total Interest Expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 21645000 21645 false false false 2 false true false false 20496000 20496 false false false 3 false true false false 43578000 43578 false false false 4 false true false false 42206000 42206 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 true 72 Income Before Income Taxes 2 uns_IncomeLossBeforeIncomeTaxes uns false credit duration Income (loss) before income taxes. false false false false false false false false false false false verboselabel false 1 false true false false 42664000 42664 false false false 2 false true false false 42706000 42706 false false false 3 false true false false 59362000 59362 false false false 4 false true false false 41840000 41840 false false false xbrli:monetaryItemType monetary Income (loss) before income taxes. No authoritative reference available. false 73 Income Tax Expense 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 15028000 15028 false false false 2 false true false false 16199000 16199 false false false 3 false true false false 21376000 21376 false false false 4 false true false false 15887000 15887 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 74 Net Income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 27636000 27636 false false false 2 true true false false 26507000 26507 false false false 3 true true false false 37986000 37986 false false false 4 true true false false 25953000 25953 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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