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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 | $ 1,178 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | $ 536 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |
Gain on sale of available-for-sale securities | 1,163 us-gaap_GainLossOnInvestments | 530 us-gaap_GainLossOnInvestments |
Rudolph Technologies, Inc [Member] |  |  |
Subsequent Event [Line Items] |  |  |
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 |
Rudolph Technologies, Inc [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Available-for-sale shares sold |  |  | 73,583 else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from Sale and Maturity of Available-for-sale Securities |  |  | 824 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Gain on sale of available-for-sale securities |  |  | $ 815 us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Available-for-sale Securities, Shares Sold + References No definition available. + Details
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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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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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