MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2022

MARKETABLE SECURITIES [Abstract]

Composition of Marketable Securities

The composition of our short-term and long-term marketable securities was as follows:

	September 30, 2022
(In thousands)	Amortized ‎Cost		Gross ‎Unrealized ‎Gains		Gross Unrealized Losses		Fair ‎Value
Short-term:
Municipal bonds	$	65,662	$	—	$	(1,457)	$	64,205
Corporate debt securities		191,993		—		(3,646)		188,347
Commercial paper		8,644		—		(12)		8,632
Asset-backed securities		—		—		—		—
Government, federal agency, and other sovereign obligations		9,942		—		(63)		9,879
Total short-term marketable securities	$	276,241	$	—	$	(5,178)	$	271,063
Long-term:
Municipal bonds	$	67,771	$	—	$	(2,497)	$	65,274
Corporate debt securities		280,053		—		(12,779)		267,274
Asset-backed securities		116,909		—		(3,340)		113,569
Government, federal agency, and other sovereign obligations		59,395		—		(1,547)		57,848
Total long-term marketable securities	$	524,128	$	—	$	(20,163)	$	503,965

	December 31, 2021
(In thousands)	Amortized ‎Cost		Gross ‎Unrealized ‎Gains		Gross ‎Unrealized ‎Losses		Fair ‎Value
Short-term:
Municipal bonds	$	66,379	$	99	$	(11)	$	66,467
Corporate debt securities		107,102		434		(65)		107,471
Commercial paper		38,252		2		(1)		38,253
Asset-backed securities		12,931		58		—		12,989
Government, federal agency, and other sovereign obligations		25,231		—		(33)		25,198
Total short-term marketable securities	$	249,895	$	593	$	(110)	$	250,378
Long-term:
Municipal bonds	$	91,185	$	4	$	(409)	$	90,780
Corporate debt securities		324,492		351		(1,318)		323,525
Asset-backed securities		128,139		101		(578)		127,662
Government, federal agency, and other sovereign obligations		20,539		—		(31)		20,508
Total long-term marketable securities	$	564,355	$	456	$	(2,336)	$	562,475