Marketable Securities

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Marketable Securities

4. MARKETABLE SECURITIES

(in thousands)	December 31, 2011
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Marketable securities:
Municipal bonds	$	27,968		74		(2	)	$	28,040
Corporate bonds		15,058		16		(34	)		15,040
Government sponsored enterprise bonds		8,001		2		(4	)		7,999
Marketable securities	$	51,027		92		(40	)	$	51,079
(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

The Company considers debt securities with maturities of three months or less when purchased, to be cash equivalents. Interest is recorded when earned. 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 related income taxes.

As of December 31, 2011, remaining maturities of marketable debt securities ranged from February 2012 to November 2014, with a weighted-average remaining maturity of approximately 14 months.