Investments, Summary of Investments (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($) Company	Dec. 31, 2021 USD ($)
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		8
Number of publicly held companies in which there is an equity ownership interest of less than 20% | Company		3
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost		$ 1,223,522	$ 612,557
Gross unrealized gains		64	792
Gross unrealized losses		(12,018)	(345)
Estimated fair value		1,211,568	613,004
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost		525,314	638,615
Gross unrealized gains		130	471
Gross unrealized losses		(15,621)	(3,966)
Estimated fair value		509,823	635,120
Available-for-sale Securities [Abstract]
Amortized cost		1,748,836	1,251,172
Gross unrealized gains		194	1,263
Gross unrealized losses		(27,639)	(4,311)
Estimated fair value		1,721,391	1,248,124
Equity Securities [Abstract]
Amortized cost		35,012	27,512
Gross unrealized gains		17,257	23,852
Gross unrealized losses		(1,358)	(837)
Estimated fair value		50,911	50,527
Available-for-sale and Equity Securities [Abstract]
Amortized cost		1,783,848	1,278,684
Gross unrealized gains		17,451	25,115
Gross unrealized losses		(28,997)	(5,148)
Estimated fair value		1,772,302	1,298,651
Corporate Debt Securities [Member]
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost	[1]	513,790	383,870
Gross unrealized gains		23	728
Gross unrealized losses		(4,365)	(226)
Estimated fair value		509,448	384,372
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost		227,631	382,000
Gross unrealized gains		14	331
Gross unrealized losses		(10,143)	(2,644)
Estimated fair value		217,502	379,687
Debt Securities Issued by U.S. Government Agencies [Member]
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost		133,585	48,493
Gross unrealized gains		0	19
Gross unrealized losses		(1,829)	(18)
Estimated fair value		131,756	48,494
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost		34,339	72,935
Gross unrealized gains		0	0
Gross unrealized losses		(1,040)	(561)
Estimated fair value		33,299	72,374
Debt Securities Issued by the U.S. Treasury [Member]
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost	[1]	512,655	45,424
Gross unrealized gains		23	0
Gross unrealized losses		(5,124)	(64)
Estimated fair value		507,554	45,360
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost		245,030	137,635
Gross unrealized gains		0	139
Gross unrealized losses		(4,109)	(500)
Estimated fair value		240,921	137,274
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost		57,484	134,770
Gross unrealized gains		18	45
Gross unrealized losses		(686)	(37)
Estimated fair value		56,816	134,778
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost		18,314	39,909
Gross unrealized gains		116	1
Gross unrealized losses		(329)	(224)
Estimated fair value		18,101	39,686
Other Municipal Debt Securities [Member]
Available-for-sale Securities with Maturity of One Year or Less [Abstract]
Amortized cost		6,008
Gross unrealized gains		0
Gross unrealized losses		(14)
Estimated fair value		5,994
Available-for-sale Securities with Maturity of More Than One Year [Abstract]
Amortized cost			6,136
Gross unrealized gains			0
Gross unrealized losses			(37)
Estimated fair value			6,099
Publicly Traded Equity Securities [Member]
Equity Securities [Abstract]
Amortized cost	[2]	11,897	11,897
Gross unrealized gains		0	7,145
Gross unrealized losses		(1,358)	(837)
Estimated fair value		10,539	18,205
Available-for-sale and Equity Securities [Abstract]
Unrealized loss on equity investment		(7,700)
Privately Held Equity Securities [Member]
Equity Securities [Abstract]
Amortized cost	[3]	23,115	15,615
Gross unrealized gains		17,257	16,707
Gross unrealized losses		0	0
Estimated fair value		$ 40,372	$ 32,322

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

[2] Our equity securities included in other current assets consisted of our investments in publicly traded companies. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2022, we recognized a $7.7 million unrealized non-cash loss in our consolidated statements of operations related to a decrease in the fair value of our investments in publicly traded companies. 

[3] Our equity securities included in deposits and other assets consisted of our investments in privately held companies. We recognize our private company 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 in our consolidated balance sheets.