Fair Value Measurements - Fair Value of Financial Assets by Level (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	$ 1,356,794	$ 1,017,704
Marketable Securities:	3,357,597	3,064,362
Total Financial Assets	4,715,251	4,087,924
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	3,364,373	3,061,695
Unrealized Gains	1,231	6,827
Unrealized Losses	(8,007)	(4,160)
Fair Value	3,357,597	3,064,362
Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	3,357,597	3,069,362
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	15,640	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	15,640	0
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	15,640	0
Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	5,000
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	5,000
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,236,709	1,044,859
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,238,929	1,043,445
Unrealized Gains	468	2,874
Unrealized Losses	(2,688)	(1,460)
Fair Value	1,236,709	1,044,859
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,554,965	1,362,124
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,558,489	1,361,132
Unrealized Gains	618	2,810
Unrealized Losses	(4,142)	(1,818)
Fair Value	1,554,965	1,362,124
Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	550,283	657,379
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	551,315	657,118
Unrealized Gains	145	1,143
Unrealized Losses	(1,177)	(882)
Fair Value	550,283	657,379
Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	860	858
Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,035,025	1,015,705
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	8,980	1,999
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,988	0
U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	310,801	0
Level I
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,345,826	1,015,705
Total Financial Assets	2,583,395	2,061,422
Level I \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	1,236,709	1,044,859
Level I \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,236,709	1,044,859
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	1,236,709	1,044,859
Level I \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level I \| Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	860	858
Level I \| Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,035,025	1,015,705
Level I \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level I \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level I \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	310,801	0
Level II
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	10,968	1,999
Total Financial Assets	2,131,856	2,026,502
Level II \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	2,120,888	2,024,503
Level II \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	15,640	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	15,640	0
Level II \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	5,000
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	5,000
Level II \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level II \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	1,554,965	1,362,124
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	1,554,965	1,362,124
Level II \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	550,283	657,379
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	550,283	657,379
Level II \| Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	0	0
Level II \| Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level II \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	8,980	1,999
Level II \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	1,988	0
Level II \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level III
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Total Financial Assets	0	0
Level III \| Marketable securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities	0	0
Level III \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III \| Certificates of deposits
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III \| Agency securities
Assets, Fair Value Disclosure [Abstract]
Marketable Securities:	0	0
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Fair Value	0	0
Level III \| Money market funds - restricted
Assets, Fair Value Disclosure [Abstract]
Money market funds - restricted	0	0
Level III \| Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level III \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level III \| Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	0	0
Level III \| U.S. government notes
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents:	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of other assets.

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