Cash Equivalents and Investments - Schedule of Cash Equivalents and Short and Long-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Equity Securities
Amortized Cost	$ 3,807,443	$ 3,187,097
Gross Unrealized Gains	14,474	4,100
Gross Unrealized Losses	(214)	(4,006)
Fair Value	3,823,610	3,187,922
Cash Equivalents	544,441	629,715
Short-Term Investments	1,720,323	1,514,808
Long-Term Investments	1,558,846	1,043,399
Debt Securities
Debt Securities
Amortized Cost	3,807,443	3,187,097
Gross Unrealized Gains	14,474	4,100
Gross Unrealized Losses	(214)	(4,006)
Fair Value	3,821,703	3,187,191
Equity Securities
Cash Equivalents	544,441	629,715
Short-Term Investments	1,718,416	1,514,077
Long-Term Investments	1,558,846	1,043,399
Debt Securities | Level 1
Debt Securities
Amortized Cost	2,663,693	2,307,588
Gross Unrealized Gains	7,485	2,007
Gross Unrealized Losses	(127)	(2,547)
Fair Value	2,671,051	2,307,048
Equity Securities
Cash Equivalents	544,441	614,888
Short-Term Investments	1,382,112	1,155,218
Long-Term Investments	744,498	536,942
Debt Securities | Level 1 | Money market funds
Debt Securities
Amortized Cost	513,512	614,888
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	513,512	614,888
Equity Securities
Cash Equivalents	513,512	614,888
Short-Term Investments	0	0
Long-Term Investments	0	0
Debt Securities | Level 1 | U.S. Treasury securities
Debt Securities
Amortized Cost	2,150,181	1,692,700
Gross Unrealized Gains	7,485	2,007
Gross Unrealized Losses	(127)	(2,547)
Fair Value	2,157,539	1,692,160
Equity Securities
Cash Equivalents	30,929	0
Short-Term Investments	1,382,112	1,155,218
Long-Term Investments	744,498	536,942
Debt Securities | Level 2
Debt Securities
Amortized Cost	1,143,750	879,509
Gross Unrealized Gains	6,989	2,093
Gross Unrealized Losses	(87)	(1,459)
Fair Value	1,150,652	880,143
Equity Securities
Cash Equivalents	0	14,827
Short-Term Investments	336,304	358,859
Long-Term Investments	814,348	506,457
Debt Securities | Level 2 | U.S. agency securities
Debt Securities
Amortized Cost	269,994	286,007
Gross Unrealized Gains	172	27
Gross Unrealized Losses	(65)	(197)
Fair Value	270,101	285,837
Equity Securities
Cash Equivalents	0	0
Short-Term Investments	22,505	137,151
Long-Term Investments	247,596	148,686
Debt Securities | Level 2 | Commercial paper
Debt Securities
Amortized Cost	285,884	184,465
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Fair Value	285,882	184,465
Equity Securities
Cash Equivalents	0	14,827
Short-Term Investments	285,882	169,638
Long-Term Investments	0	0
Debt Securities | Level 2 | Corporate debt securities
Debt Securities
Amortized Cost	587,872	409,037
Gross Unrealized Gains	6,817	2,066
Gross Unrealized Losses	(20)	(1,262)
Fair Value	594,669	409,841
Equity Securities
Cash Equivalents	0	0
Short-Term Investments	27,917	52,070
Long-Term Investments	566,752	357,771
Equity Securities | Level 1
Equity Securities
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	1,907	731
Cash Equivalents	0	0
Short-Term Investments	1,907	731
Long-Term Investments	0	0
Equity Securities | Level 1 | Mutual funds
Equity Securities
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	1,907	731
Cash Equivalents	0	0
Short-Term Investments	1,907	731
Long-Term Investments	$ 0	$ 0