Marketable Securities

9 Months Ended

Sep. 30, 2011

Marketable Securities [Abstract]

Marketable Securities

3. MARKETABLE SECURITIES

Marketable securities classified as held-to-maturity and available-for-sale consisted of the following (in thousands):

	September 30, 2011
Held to maturity investments maturing within three months:	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss			Fair Value
Corporate bond	$	5,035	$	—	$	(11	)	$	5,024

	September 30, 2011
Available-for-sale securities	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	40,184	$		$	(259	)	$	39,925
Government and agency securities		37,135				(26	)		37,109
Asset-backed securities		26,138							26,138
Mortgage-backed securities		15,097				(113	)		14,984
Commercial paper		7,888							7,888
Municipal bonds		3,728		10					3,738
Collateralized mortgage obligations		2,130		7					2,137
Floating rate notes		381				(2	)		379
Certificates of deposit		50							50
	$	132,731	$	17	$	(400	)	$	132,348

	December 31, 2010
Held-to-maturity investments maturing within three months	Amortized Cost		Gross Unrealized Holding Gain		Gross Unrealized Holding Loss			Fair Value
U.S. Treasury security	$	4,999	$	—	$	—		$	4,999
Corporate bonds		15,089		—		(7	)		15,082
Total held-to maturity investments	$	20,088	$	—	$	(7	)	$	20,081

	December 31, 2010
Available-for-sale securities	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Asset-backed securities	$	7,937	$	1				$	7,938
Mortgage-backed securities		7,866				(39	)		7,827
Corporate bonds		7,302				(3	)		7,299
Government and agency securities		4,074		3					4,077
Municipal bonds		1,205							1,205
Floating rate note		729				(2	)		727
Collateralized mortgage obligations		262							262
Certificate of deposit		110							110
	$	29,485	$	4	$	(44	)	$	29,445

The following table summarizes the amortized cost and fair value of the Company's marketable securities, classified by stated maturity (in thousands):

	September 30, 2011				December 31, 2010
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable securities
Due in 1 year or less	$	49,363	$	49,293	$	26,161	$	26,157
Due in 1 — 2 years		33,131		32,949		7,286		7,282
Due in 2 — 3 years		13,488		13,486		3,500		3,502
Due in 3 — 4 years		17,522		17,485		2,881		2,879
Due in 4 — 9 years		8,081		8,095		2,604		2,603
Due in 9 — 20 years		2,844		2,832		2,756		2,749
Due in 20 — 33 years		13,337		13,232		4,385		4,354
	$	137,766	$	137,372	$	49,573	$	49,526

Realized gains and losses from sales and maturities of marketable securities were not significant in any period presented.

The Company did not have any other-than-temporary declines in the fair value of its marketable securities during any period presented.

Marketable securities classified as held-to-maturity and available-for-sale are carried at amortized cost and fair value, respectively, as of September 30, 2011 and December 31, 2010.