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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 3) (Recurring basis, Level 1, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	$ 39,300	$ 15,164
Money market funds
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	36,501	12,101
Voluntary Savings Plan - mutual funds held in trust
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	$ 2,799	$ 3,063

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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=25499696&loc=d3e19207-110258

+ Details

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Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
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