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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The gross carrying amount of goodwill was as follows (in thousands):
Balance at December 31, 2023$1,753,130 
Foreign exchange(36,807)
Balance at December 31, 2024$1,716,323 
The gross carrying amounts and net book values of our intangible assets were as follows (in thousands):
December 31, 2024December 31, 2023
Remaining
Weighted-
Average Useful
Life
(In years)		Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value		Gross
Carrying
Amount		Accumulated
Amortization		Net Book
Value
Acquired developed technologies7.8$7,699,423 $(2,943,728)$4,755,695 $7,785,495 $(2,367,456)$5,418,039 
Manufacturing contracts—11,121 (11,121)— 11,828 (11,828)— 
Trademarks—2,868 (2,868)— 2,886 (2,886)— 
Total finite-lived intangible assets$7,713,412 $(2,957,717)$4,755,695 $7,800,209 $(2,382,170)$5,418,039 
The decrease in the gross carrying amount of intangible assets as of December 31, 2024 compared to December 31, 2023 primarily relates to the negative impact of foreign currency translation adjustments due to the weakening of sterling and euro against the U.S. dollar.
The assumptions and estimates used to determine future cash flows and remaining useful lives of our intangible and other long-lived assets are complex and subjective. They can be affected by various factors, including external factors, such as industry and economic trends, and internal factors such as changes in our business strategy and our forecasts for specific product lines.
Based on finite-lived intangible assets recorded as of December 31, 2024, and assuming the underlying assets will not be impaired and that we will not change the expected lives of any other assets, future amortization expenses were estimated as follows (in thousands):
Year Ending December 31,Estimated Amortization Expense
2025$618,043 
2026618,043 
2027618,043 
2028616,711 
2029614,977 
Thereafter1,669,878 
Total$4,755,695