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Stock Based Compensation (Schedule Of Compensation Expense And Reductions In Earnings Per Share) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-Based Compensation Expense $ 120,000us-gaap_AllocatedShareBasedCompensationExpense $ 120,000us-gaap_AllocatedShareBasedCompensationExpense $ 420,000us-gaap_AllocatedShareBasedCompensationExpense
Related Reduction in Earnings Per Share $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted [1] $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted [1]  
Stock Grants To Directors & Officers [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-Based Compensation Expense 120,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ish_StockGrantsToDirectorsAndOfficersMember
120,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ish_StockGrantsToDirectorsAndOfficersMember
 
RSUs Awards To Officers [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-Based Compensation Expense $ 1,416,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ish_RsusAwardsToOfficersMember
$ 1,299,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ish_RsusAwardsToOfficersMember
 
[1] Same for basic and diluted earnings per share