Investments, Summary of Investments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2025 USD ($) Company	Dec. 31, 2024 USD ($)
Ownership Interests in Private and Public Companies [Abstract]
Number of private companies in which there is an equity ownership interest of less than 20% | Company		7
Number of public 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		$ 1,233,261	$ 1,402,258
Gross unrealized gains		850	1,607
Gross unrealized losses		(549)	(399)
Estimated fair value		1,233,562	1,403,466
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		680,878	654,600
Gross unrealized gains		1,648	984
Gross unrealized losses		(1,177)	(3,042)
Estimated fair value		681,349	652,542
Available-for-sale Debt Securities [Abstract]
Amortized cost		1,914,139	2,056,858
Gross unrealized gains		2,498	2,591
Gross unrealized losses		(1,726)	(3,441)
Estimated fair value		1,914,911	2,056,008
Equity Securities [Abstract]
Amortized cost		35,012	35,012
Gross unrealized gains		25,042	25,027
Gross unrealized losses		(15,949)	(13,753)
Estimated fair value		44,105	46,286
Available-for-sale Debt and Equity Securities [Abstract]
Amortized cost		1,949,151	2,091,870
Gross unrealized gains		27,540	27,618
Gross unrealized losses		(17,675)	(17,194)
Estimated fair value		1,959,016	2,102,294
Corporate Debt Securities [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost	[1]	516,458	593,810
Gross unrealized gains		299	487
Gross unrealized losses		(247)	(240)
Estimated fair value		516,510	594,057
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		471,479	439,561
Gross unrealized gains		1,086	723
Gross unrealized losses		(1,009)	(2,275)
Estimated fair value		471,556	438,009
Debt Securities Issued by U.S. Government Agencies [Member]
Available-for-sale Debt Securities with Maturity of One Year or Less [Abstract]
Amortized cost		120,961	143,647
Gross unrealized gains		156	287
Gross unrealized losses		(32)	(39)
Estimated fair value		121,085	143,895
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		61,184	65,255
Gross unrealized gains		188	137
Gross unrealized losses		(116)	(289)
Estimated fair value		61,256	65,103
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]	592,770	657,285
Gross unrealized gains		393	825
Gross unrealized losses		(270)	(120)
Estimated fair value		592,893	657,990
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		145,922	149,086
Gross unrealized gains		373	124
Gross unrealized losses		(52)	(476)
Estimated fair value		146,243	148,734
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		3,072	7,516
Gross unrealized gains		2	8
Gross unrealized losses		0	0
Estimated fair value		3,074	7,524
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		1,595
Gross unrealized gains		1
Gross unrealized losses		0
Estimated fair value		1,596
Other Municipal Debt Securities [Member]
Available-for-sale Debt Securities with Maturity of More Than One Year [Abstract]
Amortized cost		698	698
Gross unrealized gains		0	0
Gross unrealized losses		0	(2)
Estimated fair value		698	696
Publicly Traded Equity Securities [Member]
Equity Securities [Abstract]
Amortized cost	[2]	11,897	11,897
Gross unrealized gains		41	26
Gross unrealized losses		(8,856)	(6,660)
Estimated fair value		3,082	5,263
Available-for-sale Debt and Equity Securities [Abstract]
Unrealized loss on equity securities		(2,200)
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)	(7,093)
Estimated fair value		$ 41,023	$ 41,023

[1] Includes investments classified as cash equivalents in our condensed 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 three months ended March 31, 2025, we recorded a $2.2 million net unrealized loss in our condensed consolidated statements 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.