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Investments in Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investments by contractual maturity    
Due or callable in one year or less, Cost $ 3,772 $ 44,616
Due or callable in one year or less, Fair Value 3,772 44,618
Due after one year, Cost      
Due after one year, Fair Value