Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Measurements

Schedule of assets measured at fair value on a recurring basis

Assets measured at fair value on a recurring basis are summarized below (in thousands):

	Fair Value Measurements as of June 30, 2021
	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds and bond funds	$	80,991	$	—	$	80,991	$	—
Commercial paper		528,830		—		528,830		—
	$	609,821	$	—	$	609,821	$	—
Cash and Cash Equivalents		345,854		345,854		—		—
Total Assets Measured at Fair Value	$	955,675	$	345,854	$	609,821	$	—

	Fair Value Measurements as of December 31, 2020
	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds and bond funds	$	117,928	$	—	$	117,928	$	—
Commercial paper		492,257		—		492,257		—
	$	610,185	$	—	$	610,185	$	—
Cash and Cash Equivalents		215,723		215,723		—		—
Total Assets Measured at Fair Value	$	825,908	$	215,723	$	610,185	$	—