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Intangible Assets and Liabilities (Tables)
 9 Months Ended
Sep. 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:
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)
Summary of Intangible Asset Account Activity
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)
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 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