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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2013
Summary of Significant Accounting Policies Investments in Marketable Securities [Abstract]  
Marketable Securities
Short-term marketable securities for the periods presented were comprised of the following (in thousands):
 
March 31, 2013
Security Type
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government fixed income securities(1)
$
134,610

 
$
38

 
$
(361
)
 
$
134,287

Total short-term investments
$
134,610

 
$
38

 
$
(361
)
 
$
134,287


(1) Maturity dates ranging from 2013 to 2014.
 
December 31, 2012
Security Type
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government fixed income securities
$
87,394

 
$
20

 
$
(411
)
 
$
87,003

Equity securities of certain technology companies
3,254

 
—

 
(782
)
 
2,472

Total short-term investments
$
90,648

 
$
20

 
$
(1,193
)
 
$
89,475