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Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Amortized cost  
Duration of one year or less $ 449,266
Duration of one through three years 600,905
Duration of three through five years 64,293
Total 1,114,464
Fair value  
Duration of one year or less 450,044
Duration of one through three years 602,095
Duration of three through five years 64,778
Total $ 1,116,917