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Intangible Assets and Liabilities
 6 Months Ended
Jun. 30, 2024
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, 2024December 31, 2023
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$512,185 $(498,767)$13,418 $502,010 $(499,571)$2,439 
Customer contracts and relationships327,053 (289,556)37,497 329,688 (287,653)42,035 
Trademarks and trade names72,495 (70,925)1,570 73,461 (71,740)1,721 
Other12,019 (11,960)59 12,019 (11,932)87 
Total intangible assets
$923,752 $(871,208)$52,544 $917,178 $(870,896)$46,282 
Intangible Liabilities
Customer contracts and relationships$(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 thousands20242023
Intangible assets, gross beginning balance$917,178 $905,134 
Intangible assets acquired (1)
15,000 — 
Effect of change in exchange rates(8,426)7,202 
Intangible assets, gross ending balance$923,752 $912,336 
Intangible liabilities, gross beginning balance$(23,900)$(23,900)
Effect of change in exchange rates— — 
Intangible liabilities, gross ending balance$(23,900)$(23,900)

(1) On March 1, 2024, we completed the acquisition of 100% of the shares Elpis2, Inc. (Elpis Squared), a privately held software and services company. The purchase resulted in the addition of intangible assets of $15.0 million including $12.5 million identified core-developed technology and $2.5 million of customer contracts and relationships. The core-developed technology and customer contract and relationships will be amortized over the weighted-average five-year and three-year useful lives, respectively, using the straight-line method. Refer to Note 5: Goodwill and Note 17: Business Combination for additional information.

Assumed intangible liabilities reflect the present value of the projected cash outflows for an existing contract where remaining costs were expected to exceed projected revenues.

Estimated future annual amortization is as follows:
Year Ending December 31,Estimated Annual Amortization
In thousands
2024 (amount remaining at June 30, 2024)$9,334 
202517,660 
202613,652 
20278,275 
20282,681 
Thereafter942 
Total intangible assets subject to amortization$52,544