Fair Value Measurements - Assets and liabilities measured at fair value on recurring basis that have unobservable inputs (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 14, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Joule Processing LLC
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration			$ 41,700
Credit spread | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent Consideration, measurement input	13.51	0.1361
Fair Value | Frames Holding B.V. | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration				$ 29,100
Fair Value | Giner ELX, Inc | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration					$ 16,000
Fair Value | United Hydrogen Group Inc | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration					$ 1,100
Fair Value | Discount rate | Minimum | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent Consideration, measurement input	17.91	17.71
Fair Value | Discount rate | Maximum | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent Consideration, measurement input	18.41	19.06
Fair Value | Scenario based method
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration		$ 126,216
Fair Value | Recurring basis | Level 3 | Scenario based method
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	$ 90,620
Fair Value | Recurring basis | Level 3 | Scenario based method | Contingent consideration
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	$ 90,620