MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 2022

MARKETABLE SECURITIES [Abstract]

Composition of Marketable Securities

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

	June 30, 2022
(In thousands)	Amortized ‎Cost		Gross ‎Unrealized ‎Gains		Gross Unrealized Losses		Fair ‎Value
Short-term:
Municipal bonds	$	54,222	$	—	$	(563)	$	53,659
Corporate debt securities		161,078		—		(2,204)		158,874
Commercial paper		25,790		—		(23)		25,767
Asset-backed securities		6,000		—		—		6,000
Government, federal agency, and other sovereign obligations		13,035		—		(97)		12,938
Total short-term marketable securities	$	260,125	$	—	$	(2,887)	$	257,238
Long-term:
Municipal bonds	$	78,945	$	36	$	(2,376)	$	76,605
Corporate debt securities		296,821		1		(11,450)		285,372
Asset-backed securities		95,929		10		(2,461)		93,478
Government, federal agency, and other sovereign obligations		18,666		—		(458)		18,208
Total long-term marketable securities	$	490,361	$	47	$	(16,745)	$	473,663

	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