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Intangible Assets and Liabilities
 9 Months Ended
Sep. 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:
September 30, 2021December 31, 2020
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$511,885 $(495,799)$16,086 $525,051 $(498,113)$26,938 
Customer contracts and relationships376,572 (291,783)84,789 383,245 (280,497)102,748 
Trademarks and trade names78,448 (75,933)2,515 79,716 (76,912)2,804 
Other12,023 (11,650)373 12,025 (11,560)465 
Total intangible assets
$978,928 $(875,165)$103,763 $1,000,037 $(867,082)$132,955 
Intangible Liabilities
Customer contracts and relationships$(23,900)$22,950 $(950)$(23,900)$21,479 $(2,421)

A summary of intangible assets and liabilities activity is as follows:
Nine Months Ended September 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(21,109)9,974 
Intangible assets, gross ending balance$978,928 $971,648 
Intangible liabilities, gross beginning balance$(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 September 30, 2021)$9,450 $(491)$8,959 
202227,393 (459)26,934 
202319,811 — 19,811 
202415,631 — 15,631 
202514,655 — 14,655 
Thereafter16,823 — 16,823 
Total intangible assets subject to amortization (accretion)$103,763 $(950)$102,813