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Fair Value Measurements - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 14, 2022	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Change in fair value of contingent consideration		$ 2,239	$ 26,316	$ (2,605)
Recurring basis | Level 1 | Cash and cash equivalents
Fair Value
Assets, Fair Value		118	118		$ 212,577
Recurring basis | Level 1 | U.S. Treasuries
Fair Value
Assets, Fair Value		260,657	260,657		1,139,310
Recurring basis | Level 1 | Equity securities
Fair Value
Assets, Fair Value		67,823	67,823		134,836
Recurring basis | Level 2 | Corporate bonds
Fair Value
Assets, Fair Value		128,111	128,111		193,633
Recurring basis | Level 3 | Contingent consideration
Fair Value
Liabilities, Fair value		121,251	121,251		116,165
Joule Processing LLC
Fair Value
Contingent consideration	$ 130,000
Change in fair value of contingent consideration		3,000	21,000
Consideration paid	$ 69,872
Carrying value | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value		121,251	121,251		116,165
Carrying value | Recurring basis | Cash and cash equivalents
Fair Value
Assets, Fair Value		118	118		212,577
Carrying value | Recurring basis | Corporate bonds
Fair Value
Assets, Fair Value		128,111	128,111		193,633
Carrying value | Recurring basis | U.S. Treasuries
Fair Value
Assets, Fair Value		260,657	260,657		1,139,310
Carrying value | Recurring basis | Equity securities
Fair Value
Assets, Fair Value		67,823	67,823		134,836
Fair value | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value		121,251	121,251		116,165
Fair value | Recurring basis | Cash and cash equivalents
Fair Value
Assets, Fair Value		118	118		212,577
Fair value | Recurring basis | Corporate bonds
Fair Value
Assets, Fair Value		128,111	128,111		193,633
Fair value | Recurring basis | U.S. Treasuries
Fair Value
Assets, Fair Value		260,657	260,657		1,139,310
Fair value | Recurring basis | Equity securities
Fair Value
Assets, Fair Value		67,823	67,823		134,836
Fair value | Giner ELX, Inc | Contingent consideration
Fair Value
Liabilities, Fair value		17,400	17,400		14,500
Contingent consideration							$ 16,000
Change in fair value of contingent consideration		600	2,900
Fair value | United Hydrogen Group Inc | Contingent consideration
Fair Value
Liabilities, Fair value		1,400	1,400		1,500
Contingent consideration							$ 1,100
Change in fair value of contingent consideration		(300)	(100)
Fair value | Frames Holding B.V. | Contingent consideration
Fair Value
Liabilities, Fair value		28,300	28,300		$ 31,000
Contingent consideration						$ 29,100
Change in fair value of contingent consideration		(1,900)	(2,700)
Fair value | Joule Processing LLC | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value		74,200	74,200
Fair value | 2020 and 2021 acquisitions | Recurring basis | Contingent consideration
Fair Value
Liabilities, Fair value		$ 47,100	$ 47,100

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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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