INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2014

Investments Schedule [Abstract]

Investments

Investments consist of the following (in thousands):

	September 30, 2014		December 31, 2013
Certificates of deposit	$	18,619	$	11,012
Commercial paper		15,487		4,997
Corporate debt securities		182,858		77,441
Securities of government sponsored entities		812		7,500
Total investments	$	217,776	$	100,950

Summary of Investments Classified as Available-For-Sale Securities

The following is a summary of investments classified as available-for-sale securities (in thousands):

	Contractual Maturity (in years)		Amortized Cost		Gross Unrealized Gains(1)		Gross Unrealized Losses(1)			Aggregate Estimated Fair Value
September 30, 2014:
Classified as current assets:
Certificates of deposit		Less than 1	$	8,351	$	—	$	(8	)	$	8,343
Commercial paper		Less than 1		15,486		4		(3	)		15,487
Corporate debt securities		Less than 1		126,023		14		(51	)		125,986
Securities of government sponsored entities		Less than 1		813		—		(1	)		812
Total short-term available for sale securities			$	150,673	$	18	$	(63	)	$	150,628
Classified as long-term assets:
Certificates of deposit		1-2		10,320		—		(44	)		10,276
Corporate debt securities		1-2		56,990		3		(121	)		56,872
Total long-term available for sale securities				67,310		3		(165	)		67,148
Total available-for-sale securities			$	217,983	$	21	$	(228	)	$	217,776
December 31, 2013:
Classified as current assets:
Certificates of deposit		Less than 1	$	11,018	$	1	$	(7	)	$	11,012
Commercial paper		Less than 1		4,997		—		—			4,997
Corporate debt securities		Less than 1		77,430		19		(8	)		77,441
Securities of government sponsored entities		Less than 1		7,500		—		—			7,500
Total short-term available for sale securities			$	100,945	$	20	$	(15	)	$	100,950

(1) Unrealized gains and losses are included in other comprehensive loss.

Available-For-Sale Investments in Unrealized Loss Position

The following table presents information about available-for-sale investments in an unrealized loss position (in thousands):

	Less Than 12 Months					12 Months or Greater				Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
September 30, 2014:
Certificates of deposit	$	17,418	$	(52	)	$	—	$	—	$	17,418	$	(52	)
Commercial paper		2,995		(3	)		—		—		2,995		(3	)
Corporate debt securities		143,140		(172	)		—		—		143,140		(172	)
Securities of government sponsored entities		812		(1	)		—		—		812		(1	)
Total	$	164,365	$	(228	)	$	—	$	—	$	164,365	$	(228	)
December 31, 2013:
Certificates of deposit	$	9,802	$	(7	)	$	—	$	—	$	9,802	$	(7	)
Corporate debt securities		29,919		(8	)		—		—		29,919		(8	)
Total	$	39,721	$	(15	)	$	—	$	—	$	39,721	$	(15	)