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Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2022
Fair Value Measurements
Marketable Securities	$ 708,831	$ 574,266
Maximum period for redemption	1 year	1 year
Marketable securities at cost	$ 708,400	$ 574,000
Eve Holding, Inc
Fair Value Measurements
Warrants to purchase shares	1,500,000		1,500,000
Recurring | Fair Value
Fair Value Measurements
Marketable Securities	$ 708,831	574,266
Investments in Other Companies	5,669	8,160
Cash and Cash Equivalents	44,528	227,362
Total Assets Measured at Fair Value	759,028	809,788
Recurring | Fair Value | Bonds and bond funds
Fair Value Measurements
Marketable Securities	467,865	462,333
Recurring | Fair Value | Commercial paper
Fair Value Measurements
Marketable Securities	240,966	111,933
Recurring | Level 1
Fair Value Measurements
Investments in Other Companies	5,669
Cash and Cash Equivalents	44,528	227,362
Total Assets Measured at Fair Value	50,197	227,362
Recurring | Level 2
Fair Value Measurements
Marketable Securities	708,831	574,266
Total Assets Measured at Fair Value	708,831	574,266
Recurring | Level 2 | Bonds and bond funds
Fair Value Measurements
Marketable Securities	467,865	462,333
Recurring | Level 2 | Commercial paper
Fair Value Measurements
Marketable Securities	$ 240,966	111,933
Recurring | Level 3
Fair Value Measurements
Investments in Other Companies		8,160
Total Assets Measured at Fair Value		$ 8,160

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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