FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES

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

December 31, 2017	Level 1		Level 2			Level 3		Total
Cash	$	310,885	$	-		$	-	$	310,885
Money market funds	112,848		-			-		112,848
Certificates of deposit	-		15,720			-		15,720
Commercial paper	-		99,903			-		99,903
Variable rate demand notes	-		49,954			-		49,954
Municipal securities	-		529,984			-		529,984
U.S. government agency securities	-		81,230			-		81,230
U.S. Treasuries	-		3,397			-		3,397
Foreign currency derivatives	-		(1,484		)	-		(1,484		)
Total	$	423,733	$	778,704		$	-	$	1,202,437
Amounts included in:
Cash and cash equivalents	$	423,733	$	104,889		$	-	$	528,622
Short-term investments	-		672,933			-		672,933
Accounts receivable, net	-		95			-		95
Investments	-		2,366			-		2,366
Accrued liabilities	-		(1,579		)	-		(1,579		)
Total	$	423,733	$	778,704		$	-	$	1,202,437
December 31, 2016	Level 1		Level 2			Level 3		Total
Cash	$	278,972	$	-		$	-	$	278,972
Money market funds	76,112		-			-		76,112
Commercial paper	-		47,855			-		47,855
Variable rate demand notes	-		13,923			-		13,923
Municipal securities	-		157,617			-		157,617
U.S. government agency securities	-		26,051			-		26,051
Foreign currency derivatives	-		(528		)	-		(528		)
Total	$	355,084	$	244,918		$	-	$	600,002
Amounts included in:
Cash and cash equivalents	$	355,084	$	22,498		$	-	$	377,582
Short-term investments	-		220,554			-		220,554
Accounts receivable, net	-		236			-		236
Investments	-		2,394			-		2,394
Accrued liabilities	-		(764		)	-		(764		)
Total	$	355,084	$	244,918		$	-	$	600,002