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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2016

Marketable Securities [Abstract]

Amortized Cost And Fair Value Of Marketable Securities


As of March 31, 2016			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Corporate bonds		$	152,383		$	85		$	(90)		$	152,378
Asset backed securities			24,430			37			-			24,467
U.S. government bonds			17,057			11			-			17,068
Commercial paper			9,840			-			-			9,840
Certificates of deposit			8,600			-			-			8,600
Agency bonds			2,401			-			-			2,401
International government bonds			1,457			-			(1)			1,456
Municipal bonds			1,400			7			-			1,407
Total marketable securities		$	217,568		$	140		$	(91)		$	217,617

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 March 31, 2016			Amortized Cost			Fair Value

Due in one year or less		$	162,177		$	162,198
Due after one year through three years			55,391			55,419
		$	217,568		$	217,617