Marketable Securities

9 Months Ended

Sep. 30, 2011

Marketable Securities [Abstract]

Marketable Securities

2.    MARKETABLE SECURITIES

		$46,696		$46,696		$46,696			$46,696
(in thousands)	September 30, 2011
	Amortized   Cost		Unrealized   Gains		Unrealized   Losses			Fair Value
Marketable securities:
Municipal bonds	$	24,166		55		(5	)	$	24,216
Corporate bonds		15,132		7		(71	)		15,068
Government sponsored enterprise bonds		6,097		—		(11	)		6,086
Commercial paper		1,000		—		—			1,000
Certificates of deposit		301		—		—			301
Marketable securities	$	46,696		62		(87	)	$	46,671

(in thousands)	December 31, 2010
	Amortized   Cost		Unrealized   Gains		Unrealized   Losses			Fair Value
Marketable securities:
Government sponsored enterprise bonds	$	5,601		1		(9	)	$	5,593
Corporate bonds		5,468		—		(49	)		5,419
Commercial paper		2,999		—		(1	)		2,998
Municipal bonds		2,114		—		—			2,114
Marketable securities	$	16,182		1		(59	)	$	16,124

All of the Company's investments are classified as available-for-sale and are carried at fair value with unrealized gains and losses recorded as a component of accumulated other comprehensive income, net of tax. As of September 30, 2011, remaining maturities of marketable debt securities ranged from October 14, 2011 to November 14, 2014 with a weighted-average remaining maturity of approximately 17 months.