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Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Amortized cost  
Duration of one year or less $ 200,221
Duration of one through three years 440,196
Duration of three through five years 57,794
Total 698,211
Fair value  
Duration of one year or less 200,280
Duration of one through three years 440,405
Duration of three through five years 57,948
Total $ 698,633