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Employee Benefit Plans (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Pension plan, underfunded amount $ 963,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent    
Discount rate   4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
Rate of compensation decrease 4.00%ish_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationDecrease    
Maximum percentage of equity securities in any single industry (in hundredths) 25.00%ish_DefinedBenefitPlanMaximumPercentageOfEquitySecuritiesInAnySingleIndustry    
Maximum percentage of fixed income securities by any issuer 10.00%ish_DefinedBenefitPlanMaximumPercentageOfFixedIncomeSecuritiesByAnyIssuer    
Maximum percentage of equity securities in any single corporation 10.00%ish_DefinedBenefitPlanMaximumPercentageOfEquitySecuritiesInAnySingleCorporation    
Health care cost trend rate assumed in 2015-2069 7.40%ish_DefinedBenefitPlanHealthCareCostTrendRateAssumedForCurrentFiscalYearAndThereafter    
Dental care cost trend rate assumed in 2015-2069 5.00%ish_DefinedBenefitPlanDentalCareCostTrendRateAssumedForCurrentFiscalYearAndThereafter    
Decrease health care cost trend rate in 2015 1.50%ish_DefinedBenefitPlanAssumedHealthCareCostTrendRateDecreaseInYearTwo    
Increase health care cost trend rate in 2016 0.20%ish_DefinedBenefitPlanAssumedHealthCareCostTrendRateIncreaseInYearThree    
Increase health care cost trend rate in 2018 0.10%ish_DefinedBenefitPlanAssumedHealthCareCostTrendRateIncreaseInYearFive    
Decrease health care cost trend rate from 2019-2025 0.10%ish_DefinedBenefitPlanAssumedHealthCareCostTrendRateDecreaseThereafter    
Accumulated benefit obligations for pension plan 33,700,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 30,100,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Multiemployer contribution 2,748,000us-gaap_MultiemployerPlanPeriodContributions 3,011,000us-gaap_MultiemployerPlanPeriodContributions 3,195,000us-gaap_MultiemployerPlanPeriodContributions
Stock Compensation Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Shares authorized under the plan 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
   
Shares available to be issued under plan 115,078us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
   
Chairman One [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Liability for future policy benefits of former chairman 822,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanOneMember
   
Future policy benefits reserve 822,000ish_DeferredCompensationArrangementWithIndividualAmountReserved
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanOneMember
822,000ish_DeferredCompensationArrangementWithIndividualAmountReserved
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanOneMember
 
Chairman Two [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Liability for future policy benefits of former chairman 627,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanTwoMember
   
Future policy benefits reserve 503,000ish_DeferredCompensationArrangementWithIndividualAmountReserved
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanTwoMember
480,000ish_DeferredCompensationArrangementWithIndividualAmountReserved
/ us-gaap_TitleOfIndividualAxis
= ish_ChairmanTwoMember
 
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 35,772,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
34,414,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
28,913,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Projected pension obligation 36,735,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
32,897,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
36,617,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Discount rate 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected pension obligation 12,127,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
12,530,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
13,084,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Discount rate 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
401(k) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution amount 111,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
118,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
102,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Annual contribution per employee percentage 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
   
Annual contribution per employee amount 2,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
   
Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation 70.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityFundsMember
   
Actual plan asset allocation 71.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityFundsMember
71.50%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityFundsMember
 
Fair value of assets 25,500,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityFundsMember
24,600,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityFundsMember
 
Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation 30.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeFundsMember
   
Actual plan asset allocation 28.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeFundsMember
28.50%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeFundsMember
 
Fair value of assets $ 10,300,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeFundsMember
$ 9,800,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeFundsMember