Marketable Securities, Available-for-sale (Tables)

9 Months Ended

Sep. 30, 2014

Marketable Securities, Available-for-sale

Fair value of the available-for-sale marketable securities, by type of security

	SEPTEMBER 30, 2014
(in thousands)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES			ESTIMATED  FAIR VALUE
Type of security:
U.S. Treasury securities	$	19,223	$	4	$	(3	)	$	19,224
Obligations of U.S. government agencies	21,039		1		(26		)	21,014
Municipal debt securities	13,099		1,436		(310		)	14,225
Corporate debt securities	132,101		59		(80		)	132,080
Asset-backed securities	17,450		89		(12		)	17,527
Total debt securities	202,912		1,589		(431		)	204,070
Time deposits	2		-		-			2
Short-term pooled investments	10,015		1		-			10,016
Total marketable securities, available-for-sale	$	212,929	$	1,590	$	(431	)	$	214,088
	DECEMBER 31, 2013
Type of security:
U.S. Treasury securities	$	76,355	$	149	$	-		$	76,504
Obligations of U.S. government agencies	17,074		2		(8		)	17,068
Municipal debt securities	33,492		492		(1,008		)	32,976
Corporate debt securities	157,798		102		(21		)	157,879
Asset-backed securities	20,433		76		(20		)	20,489
Total debt securities	305,152		821		(1,057		)	304,916
Time deposits	1,606		-		-			1,606
Short-term pooled investments	6,633		-		-			6,633
Total marketable securities, available-for-sale	$	313,391	$	821	$	(1,057	)	$	313,155

Fair value of the available-for-sale marketable securities, by contractual maturity

(in thousands)	SEPTEMBER 30, 2014		DECEMBER 31, 2013
Contractual maturity:
Maturing in one year or less	$	80,094	$	129,384
Maturing after one year through three years	100,249		154,169
Maturing after three years	23,727		21,363
Total debt securities	204,070		304,916
Time deposits and short-term pooled investments	10,018		8,239
Total marketable securities, available-for-sale	$	214,088	$	313,155