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Investments and Fair Value Measurement (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investments and Fair Value Measurement (Textual) [Abstract]
Investments maturity period	2 years
Material unrealized losses		$ 7
Available for sale securities maturity percentage next twelve months	83.00%
Available for sale securities maturity percentage in twelve and twenty four months	17.00%
Available-for-sale securities [Member]
Investments and Fair Value Measurement (Textual) [Abstract]
Material unrealized losses	0
Realized losses	0	0	0
Other-than-temporary impairments of available-for-sale securities	$ 0	$ 0	$ 0

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Available for sale securities maturity percentage in next twelve months and year two.

+ References

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- Definition

Available for sale securities maturity percentage next twelve months.

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- Definition

Investments maturity dates available for sale securities.

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- Definition

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 21

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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