Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities [Abstract]

Schedule Of Marketable Securities

Marketable securities consisted of the following (in thousands):

	June 30, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	8,750	$	—	$	(13	)	$	8,737
Treasury bills	7,499		—		—			7,499
Total marketable securities	$	16,249	$	—	$	(13	)	$	16,236

	December 31, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	6,500	$	—	$	(1	)	$	6,499
Treasury bills	14,996		1		—			14,997
Total marketable securities	$	21,496	$	1	$	(1	)	$	21,496