FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2018


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
Investments		—		—		—		—
Accrued liabilities		—		(535)		—		(535)
Total	$	585,294	$	372,377	$	—	$	957,671


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