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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2012
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):
 
September 30, 2012
Security Type
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government fixed income securities
$
143,002

 
$
44

 
$
(354
)
 
$
142,692

Equity securities of certain technology companies
3,254

 
757

 
(56
)
 
3,955

Total short-term investments
$
146,256

 
$
801

 
$
(410
)
 
$
146,647


 
 
 
 
 
 
 
 
 
December 31, 2011
Security Type
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