Annual report pursuant to Section 13 and 15(d)

CASH, CASH EQUIVALENTS AND AVAILABLE-FOR-SALE SECURITIES (Tables)

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CASH, CASH EQUIVALENTS AND AVAILABLE-FOR-SALE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2012
CASH, CASH EQUIVALENTS AND AVAILABLE-FOR-SALE SECURITIES  
Schedule of cash, cash equivalents and available-for-sale securities

  Cash, cash equivalents and available-for-sale securities consist of the following (in thousands):

 
   December 31,  
 
   2012   2011  

Checking account

   $ 251   $ 686  

Money market funds

     23,936     11,947  

U. S. treasury bills

     —     3,002  

Government-sponsored enterprise securities

     77,047     144,599  

Corporate bonds and commercial paper

     197,007     87,406  
           

 

   $ 298,241   $ 247,640  
           

Reported as:

              

Cash and cash equivalents

   $ 33,484   $ 18,633  

Available-for-sale securities

     264,757     229,007  
           

 

   $ 298,241   $ 247,640  
           
Schedule of cash equivalents and available-for-sale securities including the securities with unrealized gains and losses

       Cash equivalents and available-for-sale securities included the following securities with unrealized gains and losses (in thousands):

December 31, 2012
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Government-sponsored enterprise securities

   $ 77,041   $ 37   $ (31 ) $ 77,047  

Corporate bonds and commercial paper

     196,931     98     (22 )   197,007  
                   

Total

   $ 273,972   $ 135   $ (53 ) $ 274,054  
                   

 

December 31, 2011
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

U. S. treasury bills

   $ 3,001   $ 1   $ —   $ 3,002  

Government-sponsored enterprise securities

     144,602     27     (30 )   144,599  

Corporate bonds and commercial paper

     87,398     48     (40 )   87,406  
                   

Total

   $ 235,001   $ 76   $ (70 ) $ 235,007  
                   
Schedule of contractual maturities of cash equivalents and available-for-sale securities

As of December 31, 2012, the contractual maturities of our cash equivalents and available-for-sale securities were (in thousands):

 
   Years to Maturity  
 
   Within One
Year		   After One Year
Through
Two Years		  

Money market funds

   $ 23,936   $ —  

Government-sponsored enterprise securities

     53,973     23,074  

Corporate bonds and commercial paper

     165,695     31,312  
           

 

   $ 243,604   $ 54,386  
           
Schedule of fair value and gross unrealized losses of the entity's investments in unrealized loss position

    The following table shows the fair value and gross unrealized losses of our investments in individual securities that are in an unrealized loss position, aggregated by investment category (in thousands):

December 31, 2012
  Fair
Value		   Unrealized
Losses		  

Government-sponsored enterprise securities

   $ 6,288   $ (31 )

Corporate bonds and commercial paper

     72,223     (22 )
           

 

   $ 78,511   $ (53 )