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Cash and Cash Equivalents and Investments
3 Months Ended
Mar. 31, 2012
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents Disclosure
Cash and Cash Equivalents and Investments
 
The fair value of cash and cash equivalents and investments held at March 31, 2012 and December 31, 2011 are as follows: 
 
 
As of March 31, 2012
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
(in thousands)
Cash and cash equivalents
 
$
29,010

 
$

 
$

 
$
29,010

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
548

 

 

 
548

U.S. treasury securities
 
224,155

 
3

 
(60
)
 
224,098

Total short-term investments
 
$
224,703

 
$
3

 
$
(60
)
 
$
224,646

Total cash and cash equivalents and investments
 
$
253,713

 
$
3

 
$
(60
)
 
$
253,656

 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2011
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
 
 
(in thousands)
 
 
Cash and cash equivalents
 
$
186,309

 
$

 
$

 
$
186,309

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
548

 

 

 
548

U.S. treasury securities
 
94,814

 
24

 
(3
)
 
94,835

Total short-term investments
 
$
95,362

 
$
24

 
$
(3
)
 
$
95,383

Total cash and cash equivalents and investments
 
$
281,671

 
$
24

 
$
(3
)
 
$
281,692


There were no realized gains or losses for the three months ended March 31, 2012 and 2011. The cost of securities sold is based on the specific identification method.