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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income tax allocation [Abstract]      
Income tax expense on continuing operations $ 22,151us-gaap_IncomeTaxExpenseBenefit $ 19,878us-gaap_IncomeTaxExpenseBenefit $ 12,008us-gaap_IncomeTaxExpenseBenefit
Income tax benefit on discontinued operations 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation (196)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Shareholder's equity, for compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes (395)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet (101)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet (106)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Other comprehensive income for changes in cash flow hedge (993)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 2,315us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (574)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Income tax expense continuing operations and discontinued operations 20,763shen_IncomeTaxExpenseBenefitContinuingOperationsAndDiscontinuedOperations 22,092shen_IncomeTaxExpenseBenefitContinuingOperationsAndDiscontinuedOperations 11,132shen_IncomeTaxExpenseBenefitContinuingOperationsAndDiscontinuedOperations
Current expense      
Federal taxes 16,592us-gaap_CurrentFederalTaxExpenseBenefit 3,404us-gaap_CurrentFederalTaxExpenseBenefit 3,741us-gaap_CurrentFederalTaxExpenseBenefit
State taxes 2,562us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,305us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,868us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current provision 19,154us-gaap_CurrentIncomeTaxExpenseBenefit 5,709us-gaap_CurrentIncomeTaxExpenseBenefit 5,609us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense      
Federal taxes 1,636us-gaap_DeferredFederalIncomeTaxExpenseBenefit 12,317us-gaap_DeferredFederalIncomeTaxExpenseBenefit 5,618us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State taxes 1,361us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,852us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 781us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred provision 2,997us-gaap_DeferredIncomeTaxExpenseBenefit 14,169us-gaap_DeferredIncomeTaxExpenseBenefit 6,399us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense on continuing operations 22,151us-gaap_IncomeTaxExpenseBenefit 19,878us-gaap_IncomeTaxExpenseBenefit 12,008us-gaap_IncomeTaxExpenseBenefit
Effective tax rate (in hundredths) 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Reconciliation of income taxes [Abstract]      
Computed "expected" tax expense at (35%) 19,612us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 17,312us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 10,014us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax effect 2,550us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,702us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,722us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net (11)us-gaap_IncomeTaxReconciliationOtherAdjustments (136)us-gaap_IncomeTaxReconciliationOtherAdjustments 272us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense on continuing operations 22,151us-gaap_IncomeTaxExpenseBenefit 19,878us-gaap_IncomeTaxExpenseBenefit 12,008us-gaap_IncomeTaxExpenseBenefit
Federal statutory income tax rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Deferred tax assets [Abstract]      
Lease obligations 2,733shen_DeferredTaxAssetsLeaseObligations 2,139shen_DeferredTaxAssetsLeaseObligations  
Deferred activation charges 108shen_DeferredTaxAssetsDeferredActivationCharges 107shen_DeferredTaxAssetsDeferredActivationCharges  
Allowance for doubtful accounts 306us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 370us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Inventory reserves 189us-gaap_DeferredTaxAssetsInventory 259us-gaap_DeferredTaxAssetsInventory  
State net operating loss carry-forwards, net of federal tax 717us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 650us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Accrued pension costs 1,086us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 1,018us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions  
Accrued compensation costs 1,550us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 1,140us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Asset retirement obligations 2,790us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 2,601us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations  
Intangible assets 7,921us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 7,757us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Goodwill 2,434shen_DeferredTaxAssetsGoodwill 2,660shen_DeferredTaxAssetsGoodwill  
Deferred revenues 2,691us-gaap_DeferredTaxAssetsDeferredIncome 1,873us-gaap_DeferredTaxAssetsDeferredIncome  
Total gross deferred tax assets 22,525us-gaap_DeferredTaxAssetsGross 20,574us-gaap_DeferredTaxAssetsGross  
Less valuation allowance (709)us-gaap_DeferredTaxAssetsValuationAllowance (591)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets 21,816us-gaap_DeferredTaxAssetsNet 19,983us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities [Abstract]      
Plant and equipment 87,941us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 84,772us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Franchise rights 7,686us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets 5,942us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets  
Section 481a deferred revenues 246us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 493us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome  
Deferred financing costs 106us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts 128us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts  
Prepaid insurance 116us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 241us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Gain on investments, net 409us-gaap_DeferredTaxLiabilitiesInvestments 115us-gaap_DeferredTaxLiabilitiesInvestments  
Other, net 878us-gaap_DeferredTaxLiabilitiesOther 1,876us-gaap_DeferredTaxLiabilitiesOther  
Total gross deferred tax liabilities 97,382us-gaap_DeferredIncomeTaxLiabilities 93,567us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liabilities 75,566us-gaap_DeferredTaxLiabilities 73,584us-gaap_DeferredTaxLiabilities  
Increase in valuation allowance 709us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Deferred tax asset related to various state net operating losses net of valuation allowance 8shen_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalNetOfValuationAllowance    
Unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits