Intangible Assets, Goodwill and Other (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Identifiable Intangible Assets [Table Text Block]

(in thousands)	March 31, 2021		December 31, 2020		March 31, 2020
Intangible assets subject to amortization:
Patents and purchased technology	$	14,198	$	14,198	14,198
Customer relationships	23,000		23,000		23,000
Gross carrying amount	37,198		37,198		37,198
Accumulated amortization:
Patents and purchased technology	(14,198)		(14,198)		(13,644)
Customer relationships	(17,775)		(17,363)		(16,125)
Accumulated amortization	(31,973)		(31,561)		(29,769)
Net carrying amount	5,225		5,637		7,429
Intangible assets not subject to amortization	97,921		97,921		115,421
Intangible assets, net	$	103,146	$	103,558	$	122,850

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table presents the estimated annual amortization expense for the years 2021 through 2025:

(in thousands)
2021	$	1,650
2022	1,650
2023	1,650
2024	688
2025	—

Schedule of Intangible Assets and Goodwill

Intangible assets, net consisted of the following:

(in thousands)	March 31, 2021		December 31, 2020		March 31, 2020
Intangible assets subject to amortization:
Patents and purchased technology	$	14,198	$	14,198	14,198
Customer relationships	23,000		23,000		23,000
Gross carrying amount	37,198		37,198		37,198
Accumulated amortization:
Patents and purchased technology	(14,198)		(14,198)		(13,644)
Customer relationships	(17,775)		(17,363)		(16,125)
Accumulated amortization	(31,973)		(31,561)		(29,769)
Net carrying amount	5,225		5,637		7,429
Intangible assets not subject to amortization	97,921		97,921		115,421
Intangible assets, net	$	103,146	$	103,558	$	122,850