Schedule of Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:


	December 31, 2020						December 31, 2019
In thousands	Gross Assets		Accumulated (Amortization) Accretion		Net		Gross Assets		Accumulated (Amortization) Accretion		Net
Intangible Assets
Core-developed technology	$	525,051	$	(498,113)	$	26,938	$	507,669	$	(458,109)	$	49,560
Customer contracts and relationships	383,245		(280,497)		102,748		381,288		(251,509)		129,779
Trademarks and trade names	79,716		(76,912)		2,804		78,837		(73,732)		5,105
Other	12,025		(11,560)		465		12,020		(11,367)		653


Total intangible assets	$	1,000,037	$	(867,082)	$	132,955	$	979,814	$	(794,717)	$	185,097

Intangible Liabilities
Customer contracts and relationships	$	(23,900)	$	21,479	$	(2,421)	$	(23,900)	$	13,450	$	(10,450)

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


	Year Ended December 31,
In thousands	2020		2019
Intangible assets, gross beginning balance	$	979,814	$	981,160
Intangibles disposed in sale of business	(18,140)		—

Effect of change in exchange rates	38,363		(1,346)
Intangible assets, gross ending balance	$	1,000,037	$	979,814

Intangible liabilities, gross beginning balance	$	(23,900)	$	(23,900)

Effect of change in exchange rates	—		—
Intangible liabilities, gross ending balance	$	(23,900)	$	(23,900)

Estimated future annual amortization (accretion) is as follows:


Year Ending December 31,	Amortization		Accretion		Estimated Annual Amortization, net
In thousands
2021	$	38,033	$	(1,962)	$	36,071
2022	27,599		(459)		27,140
2023	19,955		—		19,955
2024	15,746		—		15,746
2025	14,742		—		14,742
Thereafter	16,880		—		16,880
Total intangible assets subject to amortization (accretion)	$	132,955	$	(2,421)	$	130,534