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Marketable Securities and Fair Value Measurements Available For Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less $ 244,820 $ 127,040
Due in greater than one year 136,017 101,978
Total available for sale short-term and long-term marketable securities $ 380,837 $ 229,018