INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2014

Investments Schedule [Abstract]

Investments

Investments consist of the following (in thousands):

	June 30, 2014		December 31, 2013
Certificates of deposit	$	16,288	$	11,012
Commercial paper		15,473		4,997
Corporate debt securities		185,725		77,441
Securities of government sponsored entities		5,007		7,500
Total investments	$	222,493	$	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
June 30, 2014:
Classified as current assets:
Certificates of deposit		Less than 1	$	11,511	$	1	$	(11	)	$	11,501
Commercial paper		Less than 1		15,476		2		(5	)		15,473
Corporate debt securities		Less than 1		125,273		14		(57	)		125,230
Securities of government sponsored entities		Less than 1		5,008		—		(1	)		5,007
Total short-term available for sale securities			$	157,268	$	17	$	(74	)	$	157,211
Classified as long-term assets:
Certificates of deposit		1-2		4,800		—		(13	)		4,787
Corporate debt securities		1-2		60,551		6		(62	)		60,495
Total long-term available for sale securities				65,351		6		(75	)		65,282
Total available-for-sale securities			$	222,619	$	23	$	(149	)	$	222,493
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
June 30, 2014:
Certificates of deposit	$	14,608	$	(24	)	$	—	$	—	$	14,608	$	(24	)
Commercial paper		7,484		(5	)		—		—		7,484		(5	)
Corporate debt securities		145,202		(119	)		—		—		145,202		(119	)
Securities of government sponsored entities		5,007		(1	)		—		—		5,007		(1	)
Total	$	172,301	$	(149	)	$	—	$	—	$	172,301	$	(149	)
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	)