Investments, Summary of Investments (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2024 USD ($) Company	Dec. 31, 2023 USD ($)
Ownership Interests in Private and Public Companies [Abstract]
Number of privately held companies in which there is an equity ownership interest of less than 20% | Company		7
Number of publicly held companies in which there is an equity ownership interest of less than 20% | Company		3
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost		$ 1,402,258	$ 1,316,219
Gross unrealized gains		1,607	415
Gross unrealized losses		(399)	(5,238)
Estimated fair value		1,403,466	1,311,396
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		654,600	651,628
Gross unrealized gains		984	3,063
Gross unrealized losses		(3,042)	(1,197)
Estimated fair value		652,542	653,494
Available-for-sale Debt Securities [Abstract]
Amortized cost		2,056,858	1,967,847
Gross unrealized gains		2,591	3,478
Gross unrealized losses		(3,441)	(6,435)
Estimated fair value		2,056,008	1,964,890
Equity Securities [Abstract]
Amortized cost		35,012	35,012
Gross unrealized gains		25,027	25,237
Gross unrealized losses		(13,753)	(10,957)
Estimated fair value		46,286	49,292
Available-for-sale Debt and Equity Securities [Abstract]
Amortized cost		2,091,870	2,002,859
Gross unrealized gains		27,618	28,715
Gross unrealized losses		(17,194)	(17,392)
Estimated fair value		2,102,294	2,014,182
Corporate Debt Securities [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost	[1]	593,810	559,967
Gross unrealized gains		487	157
Gross unrealized losses		(240)	(2,625)
Estimated fair value		594,057	557,499
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		439,561	243,151
Gross unrealized gains		723	1,270
Gross unrealized losses		(2,275)	(692)
Estimated fair value		438,009	243,729
Debt Securities Issued by U.S. Government Agencies [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost		143,647	224,711
Gross unrealized gains		287	64
Gross unrealized losses		(39)	(611)
Estimated fair value		143,895	224,164
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		65,255	110,138
Gross unrealized gains		137	547
Gross unrealized losses		(289)	(21)
Estimated fair value		65,103	110,664
Debt Securities Issued by the U.S. Treasury [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost	[1]	657,285	513,784
Gross unrealized gains		825	152
Gross unrealized losses		(120)	(1,889)
Estimated fair value		657,990	512,047
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		149,086	294,873
Gross unrealized gains		124	1,239
Gross unrealized losses		(476)	(480)
Estimated fair value		148,734	295,632
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost		7,516	17,757
Gross unrealized gains		8	42
Gross unrealized losses		0	(113)
Estimated fair value		7,524	17,686
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost			3,466
Gross unrealized gains			7
Gross unrealized losses			(4)
Estimated fair value			3,469
Other Municipal Debt Securities [Member]
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		698
Gross unrealized gains		0
Gross unrealized losses		(2)
Estimated fair value		696
Publicly Traded Equity Securities [Member]
Equity Securities [Abstract]
Amortized cost	[2]	11,897	11,897
Gross unrealized gains		26	236
Gross unrealized losses		(6,660)	(5,832)
Estimated fair value		5,263	6,301
Available-for-sale Debt and Equity Securities [Abstract]
Unrealized loss on equity securities		(1,000)
Privately Held Equity Securities [Member]
Equity Securities [Abstract]
Amortized cost	[3]	23,115	23,115
Gross unrealized gains		25,001	25,001
Gross unrealized losses		(7,093)	(5,125)
Estimated fair value		41,023	$ 42,991
Available-for-sale Debt and Equity Securities [Abstract]
Unrealized loss on equity securities		$ (2,000)

[1] Includes investments classified as cash equivalents in our consolidated balance sheets.

[2] Our publicly traded equity securities are included in other current assets. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2024, we recorded a $1.0 million net unrealized loss in our consolidated statement of operations related to changes in the fair value of our investments in publicly traded companies.

[3] Our privately held equity securities are included in deposits and other assets. We recognize our privately held equity securities at cost minus impairments, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer, which are Level 3 inputs. In the year ended December 31, 2024, we recorded a $2.0 million net unrealized loss in our consolidated statements of operations related to observable price changes of our investments in privately held companies.