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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2015

Marketable Securities [Abstract]

Amortized Cost And Fair Value Of Marketable Securities


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

Corporate bonds		$	110,782		$	30		$	97		$	110,715
Agency bonds			16,104			-			4			16,100
U.S. government bonds			5,091			-			-			5,091
Certificate of deposit			3,000			-			-			3,000
Commercial paper			1,496			-			-			1,496
International government bond			1,410			-			1			1,409
Municipal bond			1,400			4			-			1,404
Total marketable securities		$	139,283		$	34		$	102		$	139,215

Contractual Maturities Of Marketable Securities


As of March 31, 2015			Amortized Cost			Fair Value

Due in one year or less		$	74,100		$	74,062
Due after one through two years			65,183			65,153
		$	139,283		$	139,215