Marketable Securities, Available-for-sale (Tables)

6 Months Ended

Jun. 30, 2011

Marketable Securities, Available-for-sale

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

								JUNE 30, 2011
(in thousands)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES			ESTIMATED FAIR VALUE
Type of security:
U.S. Treasury securities	$	3,156	$	1	$	-		$	3,157
Obligations of U.S. and local government agencies	36,443		45		(175		)	36,313
Corporate debt securities issued under
U.S. government/agency-backed programs	6,557		3		-			6,560
Corporate debt securities	163,306		334		(69		)	163,571
Asset-backed securities	23,515		53		(91		)	23,477
Total debt securities	232,977		436		(335		)	233,078
Time deposits	45,908		-		-			45,908
Short-term pooled investments	80,030		-		(10		)	80,020
Total marketable securities, available-for-sale	$	358,915	$	436	$	(345	)	$	359,006
							DECEMBER 31, 2010
Type of security:
U.S. Treasury securities	$	15,782	$	81	$	-		$	15,863
Obligations of U.S. and local government agencies	33,247		12		(215		)	33,044
Corporate debt securities issued under
U.S. government/agency-backed programs	170,878		112		-			170,990
Corporate debt securities	104,976		218		(92		)	105,102
Asset-backed securities	7,643		1		(12		)	7,632
Total debt securities	332,526		424		(319		)	332,631
Time deposits	76,312		-		-			76,312
Short-term pooled investments	28,850		2		-			28,852
Total marketable securities, available-for-sale	$	437,688	$	426	$	(319	)	$	437,795

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

(in thousands)	JUNE 30, 2011		DECEMBER 31, 2010
Contractual maturity:
Maturing in one year or less	$	91,028	$	22,244
Maturing after one year through three years	113,010		299,381
Maturing after three years	29,040		11,006
Total debt securities	233,078		332,631
Time deposits and short-term pooled investments	125,928		105,164
Total marketable securities, available-for-sale	$	359,006	$	437,795