Equity and Debt Securities (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Equity and Debt Securities

The Company’s equity and debt securities consisted of the following:

	December 31, 2022
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Equity securities:
Long-term
Preferred stock of privately held company	$	15,000		$	—	$	—		$	15,000
Total equity securities		15,000			—		—			15,000
Available-for-sale debt securities
Short-term
U.S. government debt securities		189,333			—		(3,373	)		185,960
Corporate debt securities		120,480			—		(2,222	)		118,258
U.S. treasury bills		69,991			—		(193	)		69,798
U.S. agency debt securities		68,411			—		(342	)		68,069
Money market accounts		27,455			—		—			27,455
Municipal bonds		7,371			—		(80	)		7,291
Yankee debt securities		2,347			—		(5	)		2,342
Less: Cash equivalents		(32,444	)		—		—			(32,444	)
Total debt securities due within 1 year		452,944			—		(6,215	)		446,729
After 1 year through 5 years
U.S. government debt securities		152,435			2		(6,349	)		146,088
U.S. agency debt securities		92,054			—		(3,435	)		88,619
Corporate debt securities		80,647			—		(4,756	)		75,891
Municipal bonds		12,065			—		(217	)		11,848
Yankee debt securities		753			—		(85	)		668
Redeemable preferred stock investment		20,000			—		(7,615	)		12,385
Total debt securities due after 1 year through 5 years		357,954			2		(22,457	)		335,499
After 5 years through 10 years
Municipal bonds		3,617			—		(83	)		3,534
Total debt securities due after 5 years through 10 years		3,617			—		(83	)		3,534
Total available-for-sale debt securities		814,515			2		(28,755	)		785,762
Total equity and debt securities	$	829,515		$	2	$	(28,755	)	$	800,762

	December 31, 2021
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Equity securities:
Short-term
Bond funds	$	99,314		$	—	$	(515	)	$	98,799
Exchange traded funds		35,174			—		(174	)		35,000
Total equity securities		134,488			—		(689	)		133,799
Available-for-sale debt securities
Short-term
Corporate debt securities		92,116			24		(148	)		91,992
Money market accounts		77,067			—		—			77,067
U.S. government debt securities		51,318			—		(81	)		51,237
Municipal bonds		4,980			—		(12	)		4,968
Yankee debt securities		3,615			—		(6	)		3,609
Less: Cash equivalents		(77,067	)		—		—			(77,067	)
Total debt securities due within 1 year		152,029			24		(247	)		151,806
After 1 year through 5 years
Corporate debt securities		242,421			29		(1,913	)		240,537
U.S. government debt securities		147,699			7		(786	)		146,920
U.S. agency debt securities		70,069			—		(535	)		69,534
Municipal bonds		11,920			13		(11	)		11,922
Yankee debt securities		8,633			—		(89	)		8,544
Total debt securities due after 1 year through 5 years		480,742			49		(3,334	)		477,457
After 5 years through 10 years
Municipal bonds		7,633			—		(43	)		7,590
Redeemable preferred stock investment		20,000			1,965		—			21,965
Total debt securities due after 5 years through 10 years		27,633			1,965		(43	)		29,555
Total available-for-sale debt securities		660,404			2,038		(3,624	)		658,818
Total equity and debt securities	$	794,892		$	2,038	$	(4,313	)	$	792,617