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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair value of asset measured on a recurring basis    
Fixed income available-for-sale securities $ 42,979 $ 45,999
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of asset measured on a recurring basis    
Money market funds 5,243 [1] 5,215 [1]
Fixed income available-for-sale securities 0 [2] 0 [2]
Total 5,243 5,215
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 42,979 [2] 45,999 [2]
Total 42,979 45,999
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 5,243 [1] 5,215 [1]
Fixed income available-for-sale securities 42,979 [2] 45,999 [2]
Total $ 48,222 $ 51,214
[1] Included in cash and cash equivalents in the Company’s consolidated balance sheets
[2] Represents our portfolio of available for sale securities and is included in either cash and cash equivalents or short-term investments in the Company’s consolidated balance sheets