FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2011

FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES

Schedule of financial assets recorded at fair value on a recurring basis

June 30, 2011	Level 1		Level 2			Level 3					Total
Cash	$	52,088	$		-	$			-		$	52,088
Money market funds	321,065		-			-					321,065
U.S. Treasuries	65,859		-			-					65,859
Certificates of deposit	-		50,559			-					50,559
Corporate bonds	-		2,042			-					2,042
Municipal securities	-		92,201			-					92,201
U.S. government agency securities	-		44,794			-					44,794
Variable rate demand notes	-		45,373			-					45,373
Auction rate securities	-		-			55,636					55,636
Put options related to auction rate securities	-		-			4,091					4,091
Total	$	439,012	$		234,969	$				59,727	$	733,708
Amounts included in:
Cash and cash equivalents	$	378,153	$		40,044	$			-		$	418,197
Short-term investments	60,859		194,925			25,434					281,218
Investments	-		-			30,202					30,202
Prepaid expenses and other current assets	-		-			1,632					1,632
Other assets	-		-			2,459					2,459
Total	$	439,012	$		234,969	$				59,727	$	733,708
December 31, 2010	Level 1		Level 2			Level 3					Total
Cash	$	50,202	$	-		$	-				$	50,202
Money market funds	242,001		-			-					242,001
U.S. Treasuries	85,521		-			-					85,521
Certificates of deposit	-		40,010			-					40,010
Municipal securities	-		81,899			-					81,899
U.S. government agency securities	-		19,688			-					19,688
Variable rate demand notes	-		56,107			-					56,107
Auction rate securities	-		-			68,252					68,252
Put option related to auction rate securities	-		-			3,768					3,768
Total	$	377,724	$		197,704	$				72,020	$	647,448
Amounts included in:
Cash and cash equivalents	$	311,202	$		43,640	$		-			$	354,842
Short-term investments	66,522		154,064			24,063					244,649
Investments	-		-			44,189					44,189
Prepaid expenses and other current assets	-		-			2,983					2,983
Other assets	-		-			785					785
Total	$	377,724	$		197,704	$				72,020	$	647,448

Summary of changes in fair value of the Company's Level 3 financial assets

	Auction Rate Securities			Put Options
Balance at December 31, 2010	$	68,252		$	3,768
Transfers to Level 3	-			-
Recognized gain included in income	278			20
Unrealized gain included in other comprehensive income	164			-
Settlements	(1,050		)	-
Balance at March 31, 2011	$	67,644		$	3,788
Transfers to Level 3	-			-
Recognized (loss) gain included in income	(652		)	303
Unrealized gain included in other comprehensive income	2,244			-
Settlements	(13,600		)	-
Balance at June 30, 2011	$	55,636		$	4,091