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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Short-term investments
The following table summarizes, by major security type, the Company's short-term investments as of December 31, 2012 (in thousands): 
 
 
Cost
 
Gross
 Unrealized
 Gains
 
Gross
 Unrealized
 Losses
 
Fair
 Value
Available for sale securities
 
 

 
 

 
 

 
 

Foreign government securities
 
$
1,886,822

 
$
18

 
$
(287
)
 
$
1,886,553

U.S. government securities
 
1,759,773

 
520

 
(1
)
 
1,760,292

Total
 
$
3,646,595

 
$
538

 
$
(288
)
 
$
3,646,845

The following table summarizes, by major security type, the Company's short-term investments as of September 30, 2013 (in thousands): 
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Available for sale securities
 
 

 
 

 
 

 
 

Foreign government securities
 
$
3,605,525

 
$
686

 
$
(458
)
 
$
3,605,753

U.S. government securities
 
1,880,675

 
700

 
(4
)
 
1,881,371

Corporate debt securities
 
402

 
—

 
—

 
402

Total
 
$
5,486,602

 
$
1,386

 
$
(462
)
 
$
5,487,526