Equity and Debt Securities - Summary of Equity and Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Cash and cash equivalents	$ 79,506	$ 164,894
Less: Cash equivalents, Carrying Value	(32,444)	(77,067)
Less: Cash equivalents, Fair Value	(32,444)	(77,067)
Equity and debt securities, Amortized Cost Basis	829,515	794,892
Equity and debt securities, Unrealized Gains	2	2,038
Equity and debt securities, Unrealized Losses	(28,755)	(4,313)
Equity and debt securities, Aggregate Fair Value	800,762	792,617
Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	814,515	660,404
Debt securities, Unrealized Gains	2	2,038
Debt securities, Unrealized Losses	(28,755)	(3,624)
Debt securities, Aggregate Fair Value	785,762	658,818
Short-Term Marketable Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis		152,029
Debt securities, Unrealized Gains		24
Debt securities, Unrealized Losses		(247)
Debt securities, Aggregate Fair Value		151,806
Short-Term Marketable Securities | Corporate Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis		92,116
Debt securities, Unrealized Gains		24
Debt securities, Unrealized Losses		(148)
Debt securities, Aggregate Fair Value		91,992
Short-Term Equity Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Marketable and non-marketable securities, Amortized Cost Basis		134,488
Marketable and non-marketable securities, Unrealized Losses		(689)
Marketable and non-marketable securities, Aggregate Fair Value		133,799
Short-Term Equity Securities | Bond Funds
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Marketable and non-marketable securities, Amortized Cost Basis		99,314
Marketable and non-marketable securities, Unrealized Losses		(515)
Marketable and non-marketable securities, Aggregate Fair Value		98,799
Short-Term Equity Securities | Exchange Traded Funds
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Marketable and non-marketable securities, Amortized Cost Basis		35,174
Marketable and non-marketable securities, Unrealized Losses		(174)
Marketable and non-marketable securities, Aggregate Fair Value		35,000
Short-Term Equity Securities | Money Market Accounts
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Cash and cash equivalents		77,067
Cash and cash equivalents fair value disclosure		77,067
Long Term Equity Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Marketable and non-marketable securities, Amortized Cost Basis	15,000
Marketable and non-marketable securities, Aggregate Fair Value	15,000
Long Term Equity Securities | Preferred Stock Of Privately Held Company
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Marketable and non-marketable securities, Amortized Cost Basis	15,000
Marketable and non-marketable securities, Aggregate Fair Value	15,000
Equity Securities due After 1 Year through 5 Years
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	357,954	480,742
Debt securities, Unrealized Gains	2	49
Debt securities, Unrealized Losses	(22,457)	(3,334)
Debt securities, Aggregate Fair Value	335,499	477,457
Equity Securities due After 1 Year through 5 Years | Corporate Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	80,647	242,421
Debt securities, Unrealized Gains		29
Debt securities, Unrealized Losses	(4,756)	(1,913)
Debt securities, Aggregate Fair Value	75,891	240,537
Equity Securities due After 1 Year through 5 Years | U.S. Government Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	152,435	147,699
Debt securities, Unrealized Gains	2	7
Debt securities, Unrealized Losses	(6,349)	(786)
Debt securities, Aggregate Fair Value	146,088	146,920
Equity Securities due After 1 Year through 5 Years | U.S. agency Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	92,054	70,069
Debt securities, Unrealized Losses	(3,435)	(535)
Debt securities, Aggregate Fair Value	88,619	69,534
Equity Securities due After 1 Year through 5 Years | Municipal Bonds
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	12,065	11,920
Debt securities, Unrealized Gains		13
Debt securities, Unrealized Losses	(217)	(11)
Debt securities, Aggregate Fair Value	11,848	11,922
Equity Securities due After 1 Year through 5 Years | Yankee Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	753	8,633
Debt securities, Unrealized Losses	(85)	(89)
Debt securities, Aggregate Fair Value	668	8,544
Equity Securities due After 1 Year through 5 Years | Redeemable Preferred Stock Investment
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	20,000
Debt securities, Unrealized Losses	(7,615)
Debt securities, Aggregate Fair Value	12,385
Equity Securities due After 5 Year through 10 Years
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	3,617	27,633
Debt securities, Unrealized Gains		1,965
Debt securities, Unrealized Losses	(83)	(43)
Debt securities, Aggregate Fair Value	3,534	29,555
Equity Securities due After 5 Year through 10 Years | Municipal Bonds
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	3,617	7,633
Debt securities, Unrealized Losses	(83)	(43)
Debt securities, Aggregate Fair Value	3,534	7,590
Equity Securities due After 5 Year through 10 Years | Redeemable Preferred Stock Investment
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis		20,000
Debt securities, Unrealized Gains		1,965
Debt securities, Aggregate Fair Value		21,965
Short-Term Marketable Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	452,944
Debt securities, Unrealized Losses	(6,215)
Debt securities, Aggregate Fair Value	446,729
Short-Term Marketable Securities | Corporate Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	120,480
Debt securities, Unrealized Losses	(2,222)
Debt securities, Aggregate Fair Value	118,258
Short-Term Marketable Securities | Money Market Accounts
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Cash and cash equivalents	27,455
Cash and cash equivalents fair value disclosure	27,455
Short-Term Marketable Securities | U.S. Treasury Bills
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	69,991
Debt securities, Unrealized Losses	(193)
Debt securities, Aggregate Fair Value	69,798
Short-Term Marketable Securities | U.S. Government Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	189,333	51,318
Debt securities, Unrealized Losses	(3,373)	(81)
Debt securities, Aggregate Fair Value	185,960	51,237
Short-Term Marketable Securities | U.S. agency Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	68,411
Debt securities, Unrealized Losses	(342)
Debt securities, Aggregate Fair Value	68,069
Short-Term Marketable Securities | Municipal Bonds
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	7,371	4,980
Debt securities, Unrealized Losses	(80)	(12)
Debt securities, Aggregate Fair Value	7,291	4,968
Short-Term Marketable Securities | Yankee Debt Securities
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Debt securities, Amortized Cost Basis	2,347	3,615
Debt securities, Unrealized Losses	(5)	(6)
Debt securities, Aggregate Fair Value	$ 2,342	$ 3,609