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Intangible Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
In thousandsGrossAccumulated
(Amortization) Accretion		NetGrossAccumulated
(Amortization) Accretion		Net
Intangible Assets
Core-developed technology$509,222 $(476,689)$32,533 $507,669 $(458,109)$49,560 
Customer contracts and relationships372,539 (264,075)108,464 381,288 (251,509)129,779 
Trademarks and trade names77,864 (74,485)3,379 78,837 (73,732)5,105 
Other12,023 (11,511)512 12,020 (11,367)653 
Total intangible assets
$971,648 $(826,760)$144,888 $979,814 $(794,717)$185,097 
Intangible Liabilities
Customer contracts and relationships$(23,900)$19,472 $(4,428)$(23,900)$13,450 $(10,450)
Summary of Intangible Asset Account Activity
A summary of intangible assets and liabilities activity is as follows:
Nine Months Ended September 30,
In thousands20202019
Intangible Assets, gross beginning balance$979,814 $981,160 
Intangibles disposed in sale of business(18,140)— 
Effect of change in exchange rates9,974 (15,574)
Intangible Assets, gross ending balance$971,648 $965,586 
Intangible Liabilities, gross beginning balance$(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
2020 (amount remaining at September 30, 2020)$13,252 $(2,006)$11,246 
202137,757 (1,963)35,794 
202227,368 (459)26,909 
202319,778 — 19,778 
202415,605 — 15,605 
Thereafter31,128 — 31,128 
Total intangible assets subject to amortization (accretion)$144,888 $(4,428)$140,460