FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2022

FAIR VALUE MEASUREMENTS [Abstract]

Fair Value of Assets and Liabilities Measured on Recurring Basis

(In thousands)	Balance at June 30, 2022		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	53,986	$	48,601	$	5,385	$	—
Municipal bonds		130,264		—		130,264		—
Corporate debt securities		444,246		—		444,246		—
Commercial paper		25,767		—		25,767		—
Asset-backed securities		99,478		—		99,478		—
Government, federal agency, and other sovereign obligations		31,146		—		31,146		—
Liabilities:
Business acquisition liabilities		68,314		—		—		68,314

(In thousands)	Balance at December 31, 2021		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	26,684	$	3,768	$	22,916	$	—
Municipal bonds		157,247		—		157,247		—
Corporate debt securities		430,996		—		430,996		—
Commercial paper		38,253		—		38,253		—
Asset-backed securities		140,651		—		140,651		—
Government, federal agency, and other sovereign obligations		45,706		—		45,706		—
Liabilities:
Business acquisition liabilities		70,525		—		—		70,525

Significant Unobservable Inputs in Valuation Techniques

Unobservable input	Range			Weighted Average*
Revenue risk premium	2.4%	-	4.9%	2.4%
Revenue volatility	14.0%	-	15.8%	14.9%
Discount rate	3.8%	-	8.5%	6.2%
Projected year of payment	2022	-	2032

* The weighted average rates were calculated based on the relative fair value of each business acquisition liability.

Changes in Carrying Value of Business Acquisition Liabilities

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In thousands)	2022		2021		2022		2021
Beginning balance	$	68,036	$	36,020	$	70,525	$	37,270
Purchase price contingent consideration		4,414		—		4,414		—
Contingent cash payments		(2,193)		(1,523)		(4,607)		(3,015)
Contingent RSU grants		(220)		(197)		(416)		(360)
Changes in fair value of business acquisition liabilities		(1,126)		13,870		(1,390)		14,128
Contractual payable reclassification		(597)		(175)		(212)		(28)
Ending balance	$	68,314	$	47,995	$	68,314	$	47,995