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Intangible Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets by Major Class
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)
Summary of Intangible Asset Account Activity
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)
Schedule of Intangible Assets, Future Amortization Expense
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