Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2013

Cash And Cash Equivalents [Abstract]

Marketable Securities Classified as Available-for-Sale

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

	December 31, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	45,414	$	75	$	(7	)	$	45,482
Asset-backed securities		21,222		12		(8	)		21,226
Mortgage-backed securities		15,110		33		(26	)		15,117
Commercial paper		13,890		2		—			13,892
Government and agency securities		12,255		9		—			12,264
Municipal bonds		3,817		—		(4	)		3,813
Certificates of deposit		750		—		—			750
	$	112,458	$	131	$	(45	)	$	112,544

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	49,545	$	203	$	(4	)	$	49,744
Government and agency securities		23,431		43		(27	)		23,447
Asset-backed securities		23,079		70		—			23,149
Mortgage-backed securities		12,064		40		(15	)		12,089
Commercial paper		1,200		—		—			1,200
Municipal bonds		6,273		13		—			6,286
Certificates of deposit		1,003		1		—			1,004
Floating rate notes		1,266		2		—			1,268
	$	117,861	$	372	$	(46	)	$	118,187

Amortized Cost and Fair Value of Marketable Securities Classified by Stated Maturity

The following table summarizes the amortized cost and fair value of the Company’s marketable securities, classified by stated maturity as of December 31, 2013 and 2012 (in thousands):

	December 31, 2013				December 31, 2012
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable securities
Due in 1 year or less	$	59,384	$	59,448	$	53,761	$	53,852
Due in 1-2 years		21,628		21,641		36,510		36,694
Due in 2-3 years		10,063		10,060		11,847		11,856
Due in 3-4 years		—		—		744		746
Due in 4-9 years		7,587		7,610		5,158		5,179
Due in 9-20 years		1,629		1,639		1,032		1,040
Due in 20-33 years		12,167		12,146		8,809		8,820
	$	112,458	$	112,544	$	117,861	$	118,187