MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of marketable securities

Marketable securities consist of the following (in thousands):

	March 31, 2016		December 31, 2015
Marketable other than equity securities:
Commercial paper	$	26,925	$	31,864
Corporate debt securities	132,647		125,547
Securities of government sponsored entities	39,511		34,388
Total Marketable Securities:	$	199,083	$	191,799

Schedule of available for sale securities

The following is a summary of short-term marketable securities classified as available-for-sale as of March 31, 2016 (in thousands):

	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Estimated Fair Value
Marketable other than equity securities:
Commercial paper	Less than 1	$	26,939	$	—	$	(14	)	$	26,925
Corporate debt securities	Less than 1	90,578		14		(128		)	90,464
Total maturity less than 1 year		117,517		14		(142		)	117,389
Corporate debt securities	1 to 2	42,149		86		(52		)	42,183
Securities of government-sponsored entities	1 to 2	39,510		9		(8		)	39,511
Total maturity 1 to 2 years		81,659		95		(60		)	81,694
Total available-for-sale securities		$	199,176	$	109	$	(202	)	$	199,083

The following is a summary of short-term marketable securities classified as available-for-sale as of December 31, 2015 (in thousands):

	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Estimated Fair Value
Marketable Other than Equity Securities:
Commercial paper	Less than 1	$	31,899	$	6	$	(41	)	$	31,864
Corporate debt securities	Less than 1	69,859		—		(164		)	69,695
Total maturity less than 1 year		101,758		6		(205		)	101,559
Corporate debt securities	1 to 2	56,162		—		(310		)	55,852
Securities of government-sponsored entities	1 to 2	34,522		2		(136		)	34,388
Total maturity 1 to 2 years		90,684		2		(446		)	90,240
Total available-for-sale securities		$	192,442	$	8	$	(651	)	$	191,799