The following is a summary of available-for-sale marketable securities at December 31, 2023:

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Matures within one year:
Corporate bonds	$	487,083	$	679	$	(5,942	)	$	481,820
U.S. Treasury securities		15,324		-		(63	)		15,261
U.S. Government agency securities		8,787		11		(3	)		8,795
Non-U.S. Government securities		15,161		673		(140	)		15,694
		526,355		1,363		(6,148	)		521,570
Matures after one year:
Corporate bonds		342,223		1,902		(4,444	)		339,681
U.S. Treasury securities		2,430		-		(22	)		2,408
U.S. Government agency securities		44,100		107		(121	)		44,086
Non-U.S. Government securities		20,488		1,162		-			21,650
		409,241		3,171		(4,587	)		407,825
Total	$	935,596	$	4,534	$	(10,735	)	$	929,395

The following is a summary of available-for-sale marketable securities at December 31, 2022:

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Matures within one year:
Corporate bonds	$	222,482	$	-	$	(4,657	)	$	217,825
U.S. Treasury securities		15,963		-		(284	)		15,679
Non-U.S. Government securities		7,882		-		(269	)		7,613
		246,327		-		(5,210	)		241,117
Matures after one year:
Corporate bonds		657,238		80		(26,460	)		630,858
U.S. Treasury securities		9,939		-		(261	)		9,678
Non-U.S. Government securities		5,311		-		(356	)		4,955
		672,488		80		(27,077	)		645,491
Total	$	918,815	$	80	$	(32,287	)	$	886,608