MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2022

MARKETABLE SECURITIES [Abstract]

Composition of Marketable Securities

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

	March 31, 2022
(In thousands)	Amortized ‎Cost		Gross ‎Unrealized ‎Gains		Gross Unrealized Losses		Fair ‎Value
Short-term:
Municipal bonds	$	41,252	$	9	$	(110)	$	41,151
Corporate debt securities		147,401		57		(927)		146,531
Commercial paper		36,251		—		(42)		36,209
Asset-backed securities		6,603		11		—		6,614
Government, federal agency, and other sovereign obligations		13,070		—		(70)		13,000
Total short-term marketable securities	$	244,577	$	77	$	(1,149)	$	243,505
Long-term:
Municipal bonds	$	101,483	$	4	$	(2,255)	$	99,232
Corporate debt securities		341,254		76		(7,442)		333,888
Asset-backed securities		102,013		19		(1,926)		100,106
Government, federal agency, and other sovereign obligations		14,032		—		(377)		13,655
Total long-term marketable securities	$	558,782	$	99	$	(12,000)	$	546,881

	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