Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities

Schedule of marketable securities held

	AmortizedCost		GrossUnrealizedGains		GrossUnrealizedLosses			EstimatedFairValue
U.S. government agency securities	$	3,999,000	$	—	$	(3,000	)	$	3,996,000
Corporate debt securities:
Financial	21,944,000		—		(21,000		)	21,923,000
Industrial	4,017,000		—		(4,000		)	4,013,000
Other	2,027,000		—		(3,000		)	2,024,000
Total available-for-sale securities	$	31,987,000	$	—	$	(31,000	)	$	31,956,000

Schedule of maturities of marketable securities available-for-sale

	AmortizedCost		Estimated Fair Value
Mature in one year or less	$	21,749,000	$	21,734,000
Mature after one year through two years	10,238,000		10,222,000
	$	31,987,000	$	31,956,000