Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2012

Short-term Investments [Abstract]

Short-term Investments

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	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

	December 31, 2011
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Equity securities of certain technology companies	8,427		169		(1,999		)	6,597
Total short-term investments	$	8,427	$	169	$	(1,999	)	$	6,597