Intangible Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 2021						December 31, 2020
In thousands	Gross		Accumulated (Amortization) Accretion		Net		Gross		Accumulated (Amortization) Accretion		Net
Intangible Assets
Core-developed technology	$	514,416	$	(491,146)	$	23,270	$	525,051	$	(498,113)	$	26,938
Customer contracts and relationships	378,430		(281,965)		96,465		383,245		(280,497)		102,748
Trademarks and trade names	78,763		(76,055)		2,708		79,716		(76,912)		2,804
Other	12,024		(11,606)		418		12,025		(11,560)		465
Total intangible assets	$	983,633	$	(860,772)	$	122,861	$	1,000,037	$	(867,082)	$	132,955
Intangible Liabilities
Customer contracts and relationships	$	(23,900)	$	21,969	$	(1,931)	$	(23,900)	$	21,479	$	(2,421)

Summary of Intangible Asset Account Activity

A summary of intangible assets and liabilities activity is as follows:

	Three Months Ended March 31,
In thousands	2021		2020
Intangible assets, gross beginning balance	$	1,000,037	$	979,814
Effect of change in exchange rates	(16,404)		(16,075)
Intangible assets, gross ending balance	$	983,633	$	963,739
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,	Amortization		Accretion		Estimated Annual Amortization, net
In thousands
2021 (amount remaining at March 31, 2021)	$	28,447	$	(1,472)	$	26,975
2022	27,516		(459)		27,057
2023	19,898		—		19,898
2024	15,700		—		15,700
2025	14,706		—		14,706
Thereafter	16,594		—		16,594
Total intangible assets subject to amortization (accretion)	$	122,861	$	(1,931)	$	120,930