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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
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jan. 14, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Change in fair value of contingent consideration	$ (9,200)	$ 8,769
Cash payments	10,000
Foreign currency translation adjustment	(690)
Payments of contingent consideration	836	$ 2,000
Recurring basis \| Level 3 \| Contingent consideration
Fair Value
Liabilities, Fair value	106,326		$ 126,216
Joule Processing LLC
Fair Value
Contingent consideration				$ 41,700
Change in fair value of contingent consideration	7,500
Joule Processing LLC \| Contingent consideration
Fair Value
Liabilities, Fair value	5,000
Carrying value \| Recurring basis \| Contingent consideration
Fair Value
Liabilities, Fair value	106,326		126,216
Fair value \| Recurring basis \| Contingent consideration
Fair Value
Liabilities, Fair value	106,326		126,216
Fair value \| Giner ELX, Inc \| Contingent consideration
Fair Value
Liabilities, Fair value	18,700		18,000
Contingent consideration						$ 16,000
Fair value \| United Hydrogen Group Inc \| Contingent consideration
Fair Value
Liabilities, Fair value	1,000		900
Contingent consideration						$ 1,100
Fair value \| Frames Holding B.V. \| Contingent consideration
Fair Value
Liabilities, Fair value	28,600		31,800
Contingent consideration					$ 29,100
Change in fair value of contingent consideration	(2,500)
Foreign currency translation adjustment	700
Fair value \| Joule Processing LLC \| Contingent consideration
Fair Value
Liabilities, Fair value	5,000		$ 75,500
Cash payments	10,000
Fair value \| Joule Processing LLC \| Recurring basis \| Contingent consideration
Fair Value
Liabilities, Fair value	$ 106,300