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Revenue - Performance obligations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue expected timing |  |  |  |
Revenue | $ 1,890,745 | $ 1,563,715 | $ 3,538,858 | $ 2,976,422
Remaining performance obligations | 5,300,000 |  | 5,300,000 |
Revenue recognized from performance obligations satisfied in previous periods | 600 |  | 7,900 |
Amount of contract modifications included in the expected contract value. | $ 253,700 |  | 253,700 |
Amount of unapproved contract modifications recognized as revenue on a cumulative catch-up basis |  |  | 192,700 |
Revenue recognized over time |  |  |  |
Revenue expected timing |  |  |  |
Revenue |  |  | $ 2,634,600 | $ 2,116,800

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