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Fair Value of Financial Instruments - Assets measured on a recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value of financial instruments
Long term investments	$ 153,663	$ 133,676	[1]
Fair Value, Recurring | Estimate of Fair Value Measurement
Fair value of financial instruments
Cash and cash equivalents	3,227,230	2,951,422
Debt securities (government)	289,223	287,543
Long term investments	153,663	133,676
Total assets	3,670,116	3,372,641
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring
Fair value of financial instruments
Cash and cash equivalents	3,227,230	2,951,422
Debt securities (government)	0	0
Long term investments	153,663	133,676
Total assets	3,380,893	3,085,098
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring
Fair value of financial instruments
Cash and cash equivalents	0	0
Debt securities (government)	289,223	287,543
Long term investments	0	0
Total assets	289,223	287,543
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring
Fair value of financial instruments
Cash and cash equivalents	0	0
Debt securities (government)	0	0
Long term investments	0	0
Total assets	$ 0	$ 0
[1] The condensed consolidated balance sheet at December 31, 2022 has been derived from the audited consolidated financial statements at that date.

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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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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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Amortized cost excluding accrued interest, after allowance for credit loss, 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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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