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Out Of Period Adjustments (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended
Dec. 31, 2013
item
Jun. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Sep. 30, 2011
Number of previously uncorrected misstatements 3ish_NumberOfPreviouslyUncorrectedMisstatements              
Pre-tax income     $ (44,280,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 7,925,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 22,020,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments      
Decrease to short term note receivable due to revision 3,987,000us-gaap_NotesAndLoansReceivableNetCurrent   3,204,000us-gaap_NotesAndLoansReceivableNetCurrent 3,987,000us-gaap_NotesAndLoansReceivableNetCurrent        
Increase to long term note receivable due to revision 27,659,000us-gaap_NotesAndLoansReceivableNetNoncurrent   24,455,000us-gaap_NotesAndLoansReceivableNetNoncurrent 27,659,000us-gaap_NotesAndLoansReceivableNetNoncurrent        
Increase in long-term deferred tax assets due to revision 7,325,000us-gaap_DeferredTaxAssetsNetNoncurrent     7,325,000us-gaap_DeferredTaxAssetsNetNoncurrent        
Decrease to deferred income tax expense due to revision     10,350,000us-gaap_DeferredIncomeTaxExpenseBenefit (12,351,000)us-gaap_DeferredIncomeTaxExpenseBenefit (453,000)us-gaap_DeferredIncomeTaxExpenseBenefit      
Increase to retained earnings due to revision 226,480,000us-gaap_RetainedEarningsAccumulatedDeficit   159,134,000us-gaap_RetainedEarningsAccumulatedDeficit 226,480,000us-gaap_RetainedEarningsAccumulatedDeficit        
Percentage of impact on income statement line items, threshold       1.00%ish_PercentageOfImpactOnIncomeStatementLineItemsThreshold        
Out of period adjustments   631,000us-gaap_PriorPeriodReclassificationAdjustment            
As Previously Reported [Member]                
Amount of ineffectiveness on investment hedges           674,000us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
   
Restatement Adjustment [Member]                
Pre-tax income       70,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Decrease to short term note receivable due to revision (275,000)us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
    (275,000)us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Increase to long term note receivable due to revision 275,000us-gaap_NotesAndLoansReceivableNetNoncurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
    275,000us-gaap_NotesAndLoansReceivableNetNoncurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Increase in long-term deferred tax assets due to revision 305,000us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
    305,000us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Decrease to deferred income tax expense due to revision       (305,000)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Increase to retained earnings due to revision 375,000us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
    375,000us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
       
Other Comprehensive Income Adjustment [Member]                
Out of period adjustments   674,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_OtherComprehensiveIncomeAdjustmentMember
        42,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_OtherComprehensiveIncomeAdjustmentMember
 
Net Charter Revenue Adjustment [Member]                
Out of period adjustments               (324,000)us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_NetCharterRevenueAdjustmentMember
Leases Adjustment [Member]                
Out of period adjustments               239,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_LeasesAdjustmentMember
Pre-Tax Income Adjustment [Member]                
Out of period adjustments         (85,000)us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_PreTaxIncomeAdjustmentMember
     
Net Income Adjustment [Member]                
Out of period adjustments         $ 631,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= ish_NetIncomeAdjustmentMember