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Intangible Assets and Liabilities
 6 Months Ended
Jun. 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:
June 30, 2023December 31, 2022
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$500,663 $(496,838)$3,825 $498,601 $(492,782)$5,819 
Customer contracts and relationships326,723 (277,206)49,517 322,360 (265,503)56,857 
Trademarks and trade names72,931 (71,043)1,888 72,156 (70,101)2,055 
Other12,019 (11,871)148 12,017 (11,807)210 
Total intangible assets
$912,336 $(856,958)$55,378 $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:
Six Months Ended June 30,
In thousands20232022
Intangible assets, gross beginning balance$905,134 $928,422 
Effect of change in exchange rates7,202 (22,306)
Intangible assets, gross ending balance$912,336 $906,116 
Intangible liabilities, gross beginning balance$(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 June 30, 2023)$9,230 
202415,100 
202514,356 
202610,342 
20275,629 
Thereafter721 
Total intangible assets subject to amortization$55,378