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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 3) (Recurring basis, Level 1, USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Financial Assets Measured at Fair Value |  |
Financial Assets at Fair Value | $ 25,403 | $ 15,637
Money market funds |  |
Financial Assets Measured at Fair Value |  |
Financial Assets at Fair Value | 22,801 | 12,602
Voluntary Savings Plan - mutual funds held in trust |  |
Financial Assets Measured at Fair Value |  |
Financial Assets at Fair Value | $ 2,602 | $ 3,035

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration