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Derivative Instruments (Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Recognized in OCI $ 3,099us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet [1]
Amount of Gain (Loss) Reclassified from AOCI to Income 583us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Gain/(Loss) Recognized in Income from Ineffective portion (2,810)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Interest Rate Swaps [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Recognized in OCI 243us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Amount of Gain (Loss) Reclassified from AOCI to Income 484us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Gain/(Loss) Recognized in Income from Ineffective portion 49us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
De-Designation Of Interest Rate Swaps [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Recognized in OCI 2,859us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= ish_DeDesignationOfInterestRateSwapsMember		 [1]
Gain/(Loss) Recognized in Income from Ineffective portion (2,859)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DerivativeInstrumentRiskAxis
= ish_DeDesignationOfInterestRateSwapsMember
Foreign Exchange Contracts [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Recognized in OCI (3)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Amount of Gain (Loss) Reclassified from AOCI to Income $ 99us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
[1] Other Comprehensive (Loss) Income