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Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Investment In Organization [Line Items] |  |
Gain on sale of available-for-sale securities | $ 1,163 us-gaap_GainLossOnInvestments | $ 530 us-gaap_GainLossOnInvestments
Rudolph Technologies, Inc [Member] |  |
Investment In Organization [Line Items] |  |
Investments owned, shares | 122,649 us-gaap_InvestmentOwnedBalanceShares / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember | 231,336 us-gaap_InvestmentOwnedBalanceShares / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Aggregate value of shares | 1,254 us-gaap_InvestmentsFairValueDisclosure / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember | 2,716 us-gaap_InvestmentsFairValueDisclosure / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Approximate cost | 16 us-gaap_InvestmentOwnedAtCost / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember | 30 us-gaap_InvestmentOwnedAtCost / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Available-for-sale shares sold | 108,687 else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember | 41,931 else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Gain on sale of available-for-sale securities | $ 1,163 us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember | $ 529 us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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