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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Marketable Securities [Abstract]

Amortized Cost And Fair Value Of Marketable Securities


As of June 30, 2016			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Corporate bonds		$	144,591		$	131		$	(45)		$	144,677
Asset backed securities			28,263			70			-			28,333
Certificates of deposit			20,800			-			-			20,800
Commercial paper			18,224			-			-			18,224
U.S. government bonds			12,601			21			-			12,622
Agency bonds			2,400			1			-			2,401
Municipal bonds			1,400			5			-			1,405
International government bonds			601			-			-			601
Total marketable securities		$	228,880		$	228		$	(45)		$	229,063

As of December 31, 2015			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Corporate bonds		$	177,810		$	24		$	(221)		$	177,613
U.S. government bonds			12,881			-			(10)			12,871
Agency bonds			12,068			-			(3)			12,065
Certificates of deposit			3,500			-			-			3,500
Commercial paper			3,491			-			-			3,491
International government bonds			1,462			-			(3)			1,459
Municipal bonds			1,400			-			(1)			1,399
Treasury bill			1,192			1			-			1,193
Total marketable securities		$	213,804		$	25		$	(238)		$	213,591

Contractual Maturities Of Marketable Securities


As of June 30, 2016			Amortized Cost			Fair Value

Due in one year or less		$	192,177		$	192,284
Due after one year through three years			36,703			36,779
		$	228,880		$	229,063