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Marketable Securities (Details 2) (Corporate Debt Securities [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Corporate Debt Securities [Member]
   
Cash equivalents and marketable securities, Continuous unrealized loss position    
Less than one year, Fair Value $ 120,606 $ 53,491
Unrealized gain (loss), Gross    
Less than one year, Gross Unrealized Loss $ (58) $ (15)