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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

Marketable Securities [Abstract]

Amortized Cost And Fair Value Of Marketable Securities


As of June 30, 2015			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Corporate bonds		$	143,233		$	12		$	(157)		$	143,088
Agency bonds			18,150			1			-			18,151
U.S. government bonds			10,211			4			-			10,215
Commercial paper			3,747			-			-			3,747
International government bond			2,270			-			(3)			2,267
Certificate of deposit			2,000			-			-			2,000
Municipal bond			1,400			2			-			1,402
Total marketable securities		$	181,011		$	19		$	(160)		$	180,870

Contractual Maturities Of Marketable Securities


As of June 30, 2015			Amortized Cost			Fair Value

Due in one year or less		$	114,841		$	114,783
Due after one through two years			66,170			66,087
		$	181,011		$	180,870