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Investments (Tables)
12 Months Ended
Dec. 31, 2013
Investments [Abstract]  
Investments Classified as Available-For-Sale

Investments classified as available-for-sale as of December 31, 2013 and 2012 were comprised of (in thousands):

                                 
    December 31, 2013   December 31, 2012
     Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value   Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value
Auction rate security   $ 1,175     $ 615     $ -     $ 1,790     $ 1,175     $ 409     $ -     $ 1,584  
Corporate debt securities     11,806       1       -       11,807       31,340       21       -       31,361  
Total   $ 12,981     $ 616     $ -     $ 13,597     $ 32,515     $ 430     $ -     $ 32,945