FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2019


March 31, 2019	Level 1		Level 2		Level 3		Total
Cash	$	444,489	$	—	$	—	$	444,489
Money market funds		79,611		—		—		79,611
Certificates of deposit		—		21,929		—		21,929
Commercial paper		—		63,920		—		63,920
Variable rate demand notes		—		6,806		—		6,806
Municipal securities		—		117,521		—		117,521
U.S. government agency securities		—		50,505		—		50,505
U.S. treasuries		—		97,260		—		97,260
Foreign currency derivatives		—		(133)		—		(133)
Total	$	524,100	$	357,808	$	—	$	881,908
Amounts included in:
Cash and cash equivalents	$	524,100	$	94,244	$	—	$	618,344
Short-term investments		—		263,697		—		263,697
Accounts receivable, net		—		181		—		181
Accrued liabilities		—		(314)		—		(314)
Total	$	524,100	$	357,808	$	—	$	881,908


December 31, 2018	Level 1		Level 2		Level 3		Total
Cash	$	393,936	$	—	$	—	$	393,936
Money market funds		191,358		—		—		191,358
Certificates of deposit		—		14,075		—		14,075
Commercial paper		—		60,422		—		60,422
Variable rate demand notes		—		4,005		—		4,005
Municipal securities		—		177,118		—		177,118
U.S. government agency securities		—		39,092		—		39,092
U.S. treasuries		—		78,157		—		78,157
Foreign currency derivatives		—		(492)		—		(492)
Total	$	585,294	$	372,377	$	—	$	957,671
Amounts included in:
Cash and cash equivalents	$	585,294	$	52,219	$	—	$	637,513
Short-term investments		—		320,650		—		320,650
Accounts receivable, net		—		43		—		43
Accrued liabilities		—		(535)		—		(535)
Total	$	585,294	$	372,377	$	—	$	957,671