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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and Cash Equivalents $ 8,400,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 9,400,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts Receivable, net 60,700,000us-gaap_AccountsReceivableNetCurrent 52,200,000us-gaap_AccountsReceivableNetCurrent
Accrued Revenue 48,500,000us-gaap_UnbilledContractsReceivable 56,600,000us-gaap_UnbilledContractsReceivable
Exchange Gas Receivable 15,000,000us-gaap_OtherReceivablesNetCurrent 10,800,000us-gaap_OtherReceivablesNetCurrent
Gas Inventory 1,100,000us-gaap_WeightedAverageCostInventoryAmount 1,200,000us-gaap_WeightedAverageCostInventoryAmount
Material and Supplies 6,300,000us-gaap_InventoryRawMaterialsAndSupplies 5,000,000us-gaap_InventoryRawMaterialsAndSupplies
Prepayments and Other 5,200,000us-gaap_PrepaidExpenseAndOtherAssets 4,800,000us-gaap_PrepaidExpenseAndOtherAssets
Total Current Assets 145,200,000us-gaap_AssetsCurrent 140,000,000us-gaap_AssetsCurrent
Utility Plant:    
Gas 522,900,000utl_PublicUtilitiesPropertyPlantAndEquipmentGas 477,300,000utl_PublicUtilitiesPropertyPlantAndEquipmentGas
Electric 390,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution 375,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution
Common 32,700,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentCommon 31,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentCommon
Construction Work in Progress 42,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 24,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Utility Plant 988,800,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService 909,100,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Less: Accumulated Depreciation 255,100,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation 243,500,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Net Utility Plant 733,700,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 665,600,000us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Other Noncurrent Assets:    
Regulatory Assets 107,600,000us-gaap_RegulatoryAssetsNoncurrent 100,100,000us-gaap_RegulatoryAssetsNoncurrent
Other Assets 13,700,000us-gaap_OtherAssetsNoncurrent 14,900,000us-gaap_OtherAssetsNoncurrent
Total Other Noncurrent Assets 121,300,000us-gaap_AssetsNoncurrent 115,000,000us-gaap_AssetsNoncurrent
TOTAL ASSETS 1,000,200,000us-gaap_Assets 920,600,000us-gaap_Assets
Current Liabilities:    
Accounts Payable 44,200,000us-gaap_AccountsPayableCurrent 38,100,000us-gaap_AccountsPayableCurrent
Short-Term Debt 29,300,000us-gaap_ShortTermBorrowings 60,200,000us-gaap_ShortTermBorrowings
Long-Term Debt, Current Portion 4,000,000us-gaap_LongTermDebtCurrent 2,500,000us-gaap_LongTermDebtCurrent
Energy Supply Obligations 22,100,000us-gaap_EnergyMarketingContractLiabilitiesCurrent 14,400,000us-gaap_EnergyMarketingContractLiabilitiesCurrent
Deferred Income Taxes 3,128,000us-gaap_DeferredTaxLiabilitiesCurrent 6,691,000us-gaap_DeferredTaxLiabilitiesCurrent
Environmental Obligations 3,500,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent 1,000,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Interest Payable 3,500,000us-gaap_InterestPayableCurrent 3,100,000us-gaap_InterestPayableCurrent
Regulatory Liabilities 8,700,000us-gaap_RegulatoryLiabilityCurrent 9,700,000us-gaap_RegulatoryLiabilityCurrent
Other Current Liabilities 11,000,000us-gaap_OtherLiabilitiesCurrent 9,000,000us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities 129,400,000us-gaap_LiabilitiesCurrent 144,700,000us-gaap_LiabilitiesCurrent
Noncurrent Liabilities:    
Energy Supply Obligations 1,900,000us-gaap_EnergyMarketingContractLiabilitiesNoncurrent 2,500,000us-gaap_EnergyMarketingContractLiabilitiesNoncurrent
Deferred Income Taxes 72,870,000us-gaap_DeferredTaxLiabilitiesNoncurrent 73,179,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Cost of Removal Obligations 63,800,000us-gaap_AssetRetirementObligationsNoncurrent 57,300,000us-gaap_AssetRetirementObligationsNoncurrent
Retirement Benefit Obligations 118,600,000us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent 77,300,000us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
Capital Lease Obligations 7,500,000us-gaap_CapitalLeaseObligationsNoncurrent 200,000us-gaap_CapitalLeaseObligationsNoncurrent
Environmental Obligations 2,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent 13,800,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Other Noncurrent Liabilities 1,900,000us-gaap_OtherLiabilitiesNoncurrent 1,600,000us-gaap_OtherLiabilitiesNoncurrent
Total Noncurrent Liabilities 268,600,000us-gaap_LiabilitiesNoncurrent 225,900,000us-gaap_LiabilitiesNoncurrent
Capitalization:    
Long-Term Debt, Less Current Portion 328,900,000us-gaap_LongTermDebtNoncurrent 284,800,000us-gaap_LongTermDebtNoncurrent
Stockholders' Equity:    
Common Equity (Outstanding 13,916,026 and 13,841,400 Shares) 234,700,000us-gaap_CommonStockValue 232,100,000us-gaap_CommonStockValue
Retained Earnings 38,400,000us-gaap_RetainedEarningsAccumulatedDeficit 32,900,000us-gaap_RetainedEarningsAccumulatedDeficit
Total Common Stock Equity 273,100,000utl_CommonStockEquity 265,000,000utl_CommonStockEquity
Preferred Stock 200,000us-gaap_PreferredStockValue 200,000us-gaap_PreferredStockValue
Total Stockholders' Equity 273,300,000us-gaap_StockholdersEquity 265,200,000us-gaap_StockholdersEquity
Total Capitalization 602,200,000us-gaap_CapitalizationLongtermDebtAndEquity 550,000,000us-gaap_CapitalizationLongtermDebtAndEquity
Commitments and Contingencies (Note 8)      
TOTAL LIABILITIES AND CAPITALIZATION $ 1,000,200,000us-gaap_LiabilitiesAndStockholdersEquity $ 920,600,000us-gaap_LiabilitiesAndStockholdersEquity