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Subsequent Events (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 13, 2015
Subsequent Event [Line Items]      
Proceeds from Sale and Maturity of Available-for-sale Securities $ 1,178us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities $ 536us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities  
Gain on sale of available-for-sale securities 1,163us-gaap_GainLossOnInvestments 530us-gaap_GainLossOnInvestments  
Rudolph Technologies, Inc [Member]      
Subsequent Event [Line Items]      
Available-for-sale shares sold 108,687else_AvailableForSaleSecuritiesSharesSold
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
41,931else_AvailableForSaleSecuritiesSharesSold
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
 
Gain on sale of available-for-sale securities 1,163us-gaap_GainLossOnInvestments
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
529us-gaap_GainLossOnInvestments
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
 
Rudolph Technologies, Inc [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Available-for-sale shares sold     73,583else_AvailableForSaleSecuritiesSharesSold
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Proceeds from Sale and Maturity of Available-for-sale Securities     824us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gain on sale of available-for-sale securities     $ 815us-gaap_GainLossOnInvestments
/ else_InvestmentInOrganizationAxis
= else_RudolphTechnologiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember