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Intangible Assets and Liabilities
 9 Months Ended
Sep. 30, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets and Liabilities Intangible Assets and Liabilities
The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
September 30, 2023December 31, 2022
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$497,988 $(494,989)$2,999 $498,601 $(492,782)$5,819 
Customer contracts and relationships320,995 (275,508)45,487 322,360 (265,503)56,857 
Trademarks and trade names71,903 (70,099)1,804 72,156 (70,101)2,055 
Other12,017 (11,899)118 12,017 (11,807)210 
Total intangible assets
$902,903 $(852,495)$50,408 $905,134 $(840,193)$64,941 
Intangible Liabilities
Customer contracts and relationships$(23,900)$23,900 $— $(23,900)$23,900 $— 

A summary of intangible assets and liabilities activity is as follows:
Nine Months Ended September 30,
In thousands20232022
Intangible assets, gross beginning balance$905,134 $928,422 
Effect of change in exchange rates(2,231)(47,113)
Intangible assets, gross ending balance$902,903 $881,309 
Intangible liabilities, gross beginning balance$(23,900)$(23,900)
Effect of change in exchange rates— — 
Intangible liabilities, gross ending balance$(23,900)$(23,900)

Assumed intangible liabilities reflect the present value of the projected cash outflows for an existing contract where remaining costs are expected to exceed projected revenues.
Estimated future annual amortization is as follows:
Year Ending December 31,Estimated Annual Amortization
In thousands
2023 (amount remaining at September 30, 2023)$4,496 
202414,986 
202514,267 
202610,287 
20275,628 
Thereafter744 
Total intangible assets subject to amortization$50,408