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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2012
Summary of Significant Accounting Policies Investments in Marketable Securities [Abstract]  
Marketable Securities
The following table presents marketable securities’ cost, gross unrealized gains, gross unrealized losses, and fair value by major security type recorded as short-term investments as of June 30, 2012 and December 31, 2011 (in thousands):
 
June 30, 2012
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government fixed income securities
$
124,957

 
$
22

 
$
(206
)
 
$
124,773

Equity securities of certain technology companies
6,410

 
1,489

 
(176
)
 
7,723

Total short-term investments
$
131,367

 
$
1,511

 
$
(382
)
 
$
132,496


 
 
 
 
 
 
 
 
 
December 31, 2011
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government fixed income securities
$
—

 
$
—

 
$
—

 
$
—

Equity securities of certain technology companies
8,427

 
169

 
(1,999
)
 
6,597

Total short-term investments
$
8,427

 
$
169

 
$
(1,999
)
 
$
6,597