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Intangible Assets and Liabilities
 6 Months Ended
Jun. 30, 2021
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, 2021December 31, 2020
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$518,587 $(498,890)$19,697 $525,051 $(498,113)$26,938 
Customer contracts and relationships381,112 (290,144)90,968 383,245 (280,497)102,748 
Trademarks and trade names79,232 (76,620)2,612 79,716 (76,912)2,804 
Other12,024 (11,629)395 12,025 (11,560)465 
Total intangible assets
$990,955 $(877,283)$113,672 $1,000,037 $(867,082)$132,955 
Intangible Liabilities
Customer contracts and relationships$(23,900)$22,460 $(1,440)$(23,900)$21,479 $(2,421)

A summary of intangible assets and liabilities activity is as follows:
Six Months Ended June 30,
In thousands20212020
Intangible assets, gross beginning balance$1,000,037 $979,814 
Intangibles disposed in sale of business— (18,140)
Effect of change in exchange rates(9,082)(9,449)
Intangible assets, gross ending balance$990,955 $952,225 
Intangible liabilities, gross beginning balance$(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.

The disposal of intangible assets was related to the sale of our Latin America business in June 2020. The net book value of these assets was $0.8 million at the disposal date. Refer to Note 17: Sale of Business for additional information on the transaction.

Estimated future annual amortization (accretion) is as follows:
Year Ending December 31,AmortizationAccretionEstimated Annual Amortization, net
In thousands
2021 (amount remaining at June 30, 2021)$18,976 $(981)$17,995 
202227,520 (459)27,061 
202319,908 — 19,908 
202415,708 — 15,708 
202514,713 — 14,713 
Thereafter16,847 — 16,847 
Total intangible assets subject to amortization (accretion)$113,672 $(1,440)$112,232