The following tables summarize the Company’s cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of March 31, 2014 and 2013 (in thousands):



March 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	232,704	$	—	$	—		$	232,704	$	232,704	$	—	$	—
Level 1:
Mutual Funds	1,779		31		(3		)	1,807		—		1,807		—
Level 2:
Government Agency Securities	53,976		43		(9		)	54,010		—		21,325		32,685
Commercial Paper	47,766		7		—			47,773		—		47,773		—
Corporate Bonds	98,289		195		(17		)	98,467		—		30,810		67,657
Certificates of Deposits ("CDs")	1,002		—		—			1,002		—		1,002		—
Subtotal	201,033		245		(26		)	201,252		—		100,910		100,342

Total cash, cash equivalents and investments measured at fair value	$	435,516	$	276	$	(29	)	$	435,763	$	232,704	$	102,717	$	100,342



March 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	118,881	$	—	$	—		$	118,881	$	118,881	$	—	$	—
Level 1:
U.S. Treasury Bills and Government Agency Securities	135,120		22		—			135,142		104,995		7,243		22,904
Level 2:
U.S. Treasury Bills and Government Agency Securities	91,284		38		(4		)	91,318		—		58,864		32,454
Commercial Paper	20,570		9		—			20,579		4,900		15,679		—
Corporate Bonds	58,644		54		(5		)	58,693		—		34,795		23,898
CDs	1,002		3		—			1,005		—		—		1,005
Subtotal	171,500		104		(9		)	171,595		4,900		109,338		57,357

Total cash, cash equivalents and investments measured at fair value	$	425,501	$	126	$	(9	)	$	425,618	$	228,776	$	116,581	$	80,261