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Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details) (Corporate Debt Securities And Government Debt Securities [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Corporate Debt Securities And Government Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Unrealized losses, less than 12 months	$ (144)
Unrealized losses, 12 months or more	(99)
Unrealized losses, total	(243)
Fair Value, Less than 12 months	19,313
Fair Value,12 months or more	8,112
Fair Value, Total	$ 27,425

X

- Definition

Amount of unrealized loss on investments in held-to-maturity securities that have been in a loss position for twelve months or longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

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Amount of unrealized loss on investments in held-to-maturity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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+ References

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

-Publisher FASB

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-Topic 320

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563



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