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Marketable Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of gross unrealized losses and fair values on investments
Less than 12 months, Fair Value	$ 7,468	$ 48,594
Available-for-sale securities- matures within one year, Gross unrealized losses	(50)	(115)
12 months or greater, Fair Value	948	5,476
Available-for-sale securities- matures after one year through three years, Gross unrealized losses	$ (51)	$ (984)

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details