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Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 28, 2015
Subsequent Event [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 825us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	$ 554us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Gain on sale of available-for-sale securities	815us-gaap_GainLossOnInvestments	547us-gaap_GainLossOnInvestments
Rudolph Technologies, Inc [Member]
Subsequent Event [Line Items]
Available-for-sale shares sold	73,583else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember	49,179else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Gain on sale of available-for-sale securities	815us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember	547us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember
Rudolph Technologies, Inc [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Available-for-sale shares sold			49,066else_AvailableForSaleSecuritiesSharesSold / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from Sale of Available-for-sale Securities			639us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Gain on sale of available-for-sale securities			$ 632us-gaap_GainLossOnInvestments / else_InvestmentInOrganizationAxis = else_RudolphTechnologiesIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Available-for-sale Securities, Shares Sold

+ References

No definition available.

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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=56944662&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 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

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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=49167202&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=56944662&loc=d3e3179-108585

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