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MARKETABLE SECURITIES - Gross unrealized gains (losses) on marketable securities (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized Gains	$ 208	$ 332
Gross unrealized (Losses)	(57)	(20)
Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized Gains	200	284
Gross unrealized (Losses)	(57)	(20)
Corporate Obligations
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized Gains	8	48
Gross unrealized (Losses)

X

- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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