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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair value of asset measured on a recurring basis    
Fixed income available-for-sale securities $ 42,987 $ 42,979
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of asset measured on a recurring basis    
Money market funds 5,254 [1] 5,243 [1]
Fixed income available-for-sale securities 0 [2] 0 [2]
Total 5,254 5,243
Significant Other Observable Inputs (Level 2) [Member]
   
Fair value of asset measured on a recurring basis    
Money market funds 0 [1] 0 [1]
Fixed income available-for-sale securities 42,987 [2] 42,979 [2]
Total 42,987 42,979
Significant Unobservable Inputs (Level 3) [Member]
   
Fair value of asset measured on a recurring basis    
Money market funds 0 [1] 0 [1]
Fixed income available-for-sale securities 0 [2] 0 [2]
Total 0 0
Fair Value, Measurements, Recurring [Member]
   
Fair value of asset measured on a recurring basis    
Money market funds 5,254 [1] 5,243 [1]
Fixed income available-for-sale securities 42,987 [2] 42,979 [2]
Total $ 48,241 $ 48,222
[1] Included in cash and cash equivalents in the Company’s consolidated balance sheets
[2] Represents the portfolio of available for sale securities and is included in short-term investments in the Company’s consolidated balance sheets