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Stock Based Compensation (Schedule Of Assumptions Used) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Jan. 28, 2014
Apr. 23, 2013
May 07, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Price       $ 25.95us-gaap_SharePrice $ 17.66us-gaap_SharePrice $ 19.35us-gaap_SharePrice
1 Year Vest [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Price $ 25.95us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_OneYearVestMember
$ 17.66us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_OneYearVestMember
$ 19.35us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Expected Volatilities 44.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
33.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
44.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Correlation Coefficients 0.3740ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_OneYearVestMember
0.4730ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_OneYearVestMember
0.719ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Risk Free Rate 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
0.16%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Dividend Yield 3.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
5.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
5.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Simulated Fair Value $ 23.03ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_OneYearVestMember
$ 15.33ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_OneYearVestMember
$ 17.73ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
Fair Value as a % of Grant 88.74%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_OneYearVestMember
86.81%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_OneYearVestMember
91.63%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_OneYearVestMember
     
3 Year Vest [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Price $ 25.95us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
$ 17.66us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
$ 19.35us-gaap_SharePrice
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Expected Volatilities 40.02%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
37.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
40.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Correlation Coefficients 0.5540ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
0.6250ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
0.6940ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCorrelationCoefficients
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Risk Free Rate 0.72%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
0.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
0.34%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Dividend Yield 3.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
5.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
5.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Simulated Fair Value $ 25.46ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
$ 16.57ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
$ 18.88ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSimulatedFairValue
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
     
Fair Value as a % of Grant 98.10%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
93.83%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember
97.57%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAsPercentageOfGrant
/ us-gaap_VestingAxis
= ish_ThreeYearVestMember