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Marketable Securities (Details 2) - Corporate Debt Securities [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Cash equivalents and marketable securities, Continuous unrealized loss position    
Less than one year, Fair Value $ 110,870 $ 139,989
Unrealized gain (loss), Gross    
Less than one year, Gross Unrealized Loss $ (79) $ (114)