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Stock Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
item
employee
Dec. 31, 2013
Dec. 31, 2012
Jan. 14, 2014
Jan. 15, 2013
Jan. 15, 2015
Jan. 28, 2014
May 31, 2014
May 07, 2014
Apr. 23, 2013
May 07, 2012
May 31, 2015
May 31, 2016
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock-based compensation expense included before tax $ 120,000us-gaap_AllocatedShareBasedCompensationExpense $ 120,000us-gaap_AllocatedShareBasedCompensationExpense $ 420,000us-gaap_AllocatedShareBasedCompensationExpense                      
Stock-based compensation expense included in net income 120,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 78,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 420,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax                      
Vesting period 1 year                          
Number of types of Performance-Based RSUs 2ish_NumberOfTypesOfPerformanceBasedRestrictedStockUnits                          
Number of top executives 4ish_NumberOfTopExecutives                          
Closing market stock price             25.95us-gaap_SharePrice     $ 17.66us-gaap_SharePrice $ 19.35us-gaap_SharePrice      
Impact of stock based compensation expense on basic earnings per share (in dollars per share) $ 0.02ish_ImpactOfStockBasedCompensationExpenseOnBasicEarningsPerShare                          
Impact of stock based compensation expense on diluted earnings per share (in dollars per share) $ 0.02ish_ImpactOfStockBasedCompensationExpenseOnDilutedEarningsPerShare                          
Number of shares of common stock retired to meet tax liabilities (in shares) 25,639ish_StockRetiredToMeetTaxLiabilitiesShares                          
Top Executives [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 3 years                          
Unrestricted Stock [Member] | Independent Director [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares granted to independent directors (in shares)       4,470us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= ish_UnrestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 6,708us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= ish_UnrestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                  
Unrestricted Stock [Member] | Independent Director [Member] | Subsequent Event [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares granted to independent directors (in shares)           8,100us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= ish_UnrestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                
Restricted Stock Units (RSUs) [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock-based compensation expense included in net income $ 1,400,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 1,300,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 797,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		                      
Awards Granted (in shares) 42,650us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		                          
Impact of stock based compensation expense on basic earnings per share (in dollars per share) $ 0.19ish_ImpactOfStockBasedCompensationExpenseOnBasicEarningsPerShare
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		                          
Impact of stock based compensation expense on diluted earnings per share (in dollars per share) $ 0.19ish_ImpactOfStockBasedCompensationExpenseOnDilutedEarningsPerShare
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		                          
Time Based Restricted Stock Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 3 years                          
Time Based Restricted Stock Units [Member] | 2014 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 3 years                          
Awards Granted (in shares)             7,950us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ish_TimeBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		              
Performance Based Restricted Stock Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Maximum shares allocated to each share based compensation unit (in shares) 1.5ish_MaximumSharesAllocatedToEachShareBasedCompensationUnit
/ us-gaap_AwardTypeAxis
= ish_PerformanceBasedRestrictedStockUnitsMember		                          
Absolute Performance Based Restricted Stock Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Payout percentage 33.00%ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPayoutPercentage
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember		                          
Vesting period 3 years                          
Number of top executives 4ish_NumberOfTopExecutives
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember		                          
Awards Granted (in shares) 15,138us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember		                          
Absolute Performance Based Restricted Stock Units [Member] | 2012 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares vested and paid out   21,564ish_NumberOfSharesVestedAndPaidOut
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		           1,500ish_NumberOfSharesVestedAndPaidOut
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		            
Absolute Performance Based Restricted Stock Units [Member] | 2012 Grants [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of remaining shares expected to vest (in shares)                       1,500ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		    
Absolute Performance Based Restricted Stock Units [Member] | 2013 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares vested and paid out                 8,450ish_NumberOfSharesVestedAndPaidOut
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember		          
Absolute Performance Based Restricted Stock Units [Member] | 2013 Grants [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of remaining shares expected to vest (in shares)                       3,525ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 3,525ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		  
Absolute Performance Based Restricted Stock Units [Member] | 2014 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Awards Granted (in shares)             17,351us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ish_AbsolutePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		              
Relative Performance Based Restricted Stock Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of top executives 4ish_NumberOfTopExecutives
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember		                          
Relative Performance Based Restricted Stock Units [Member] | 2012 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 3 years                          
Percentile rank 27.00%ish_PercentileRank
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		                          
Number of top executives 4ish_NumberOfTopExecutives
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		                          
Percentage of restricted stock units vested (in hundredths)   53.00%ish_PercentageOfRestrictedStockUnitsVested
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		                        
Number of shares paid out   21,564ish_NumberOfSharesPaidOut
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		                        
Number of shares to be forfeited in 2015 1,500ish_NumberOfSharesToBeForfeited
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandTwelveGrantsMember		                          
Relative Performance Based Restricted Stock Units [Member] | 2013 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Percentile rank 79.00%ish_PercentileRank
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember		                          
Number of top executives 4ish_NumberOfTopExecutives
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember		                          
Percentage of restricted stock units vested (in hundredths)                 150.00%ish_PercentageOfRestrictedStockUnitsVested
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember		          
Number of shares paid out                 20,064ish_NumberOfSharesPaidOut
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandThirteenGrantsMember		          
Relative Performance Based Restricted Stock Units [Member] | 2014 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 3 years                          
Percentile rank 10.00%ish_PercentileRank
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		                          
Number of top executives 4ish_NumberOfTopExecutives
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		                          
Number of shares forfeited 13,374ish_NumberOfSharesForfeited
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		                          
Awards Granted (in shares)             17,349us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember		              
Relative Performance Based Restricted Stock Units [Member] | 2014 Grants [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares paid out                           3,975ish_NumberOfSharesPaidOut
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= ish_TwoThousandFourteenGrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Relative Performance Based Restricted Stock Units [Member] | Independent Director [Member] | Scenario, Forecast [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of remaining shares expected to vest (in shares)                         3,525ish_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest
/ us-gaap_AwardTypeAxis
= ish_RelativePerformanceBasedRestrictedStockUnitsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		  
Relative Performance Based Restricted Stock Units [Member] | Top Executives [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 1 year                          
Relative Performance Based Restricted Stock Units [Member] | Top Executives [Member] | 2012 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 1 year                          
Relative Performance Based Restricted Stock Units [Member] | Top Executives [Member] | 2013 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 1 year                          
Relative Performance Based Restricted Stock Units [Member] | Top Executives [Member] | 2014 Grants [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period 1 year