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Cash Equivalents and Marketable Securities (Textual) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
securities
Dec. 31, 2013
securities
Mar. 31, 2013
Dec. 31, 2012
Cash Equivalents and Marketable Securities [Abstract]        
Cash and cash equivalents $ 23,163 $ 22,130 $ 31,231 $ 32,003
Money market funds 14,592 16,089    
Cash $ 8,571 $ 6,041    
Number of marketable securities in a loss position (securities) 0 0