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Fair Value of Financial Instruments - Assets measured on a recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair value of financial instruments
Long term investments	$ 128,313	$ 133,676	[1]
Fair Value, Recurring | Estimate of Fair Value Measurement
Fair value of financial instruments
Cash and cash equivalents	2,821,051	2,951,422
Debt securities (government)	291,661	287,543
Long term investments	128,313	133,676
Total assets	3,241,025	3,372,641
Fair Value, Recurring | Fair Value, Inputs, Level 1
Fair value of financial instruments
Cash and cash equivalents	2,821,051	2,951,422
Debt securities (government)	0	0
Long term investments	128,313	133,676
Total assets	2,949,364	3,085,098
Fair Value, Recurring | Fair Value, Inputs, Level 2
Fair value of financial instruments
Cash and cash equivalents	0	0
Debt securities (government)	291,661	287,543
Long term investments	0	0
Total assets	291,661	287,543
Fair Value, Recurring | Fair Value, Inputs, Level 3
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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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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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