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Debt Security Investments (Details 1) (U.S. Treasury Securities [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
U.S. Treasury Securities [Member]
Gross unrealized losses and fair value of all available for sale debt security investments
Fair value, Less than 12 months	$ 3,499
Unrealized losses, Less than 12 months	$ 13

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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