Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

6.   Goodwill and Intangible Assets. The change in the carrying amount of goodwill for the six-month period ended June 30, 2024 is detailed as follows (in thousands):

	2024
Goodwill balance at January 1	$	382,240
Effect of foreign exchange		(807)
Goodwill balance at June 30	$	381,433

Total accumulated goodwill impairment losses aggregated to $8.3 million as of June 30, 2024 and December 31, 2023, respectively. We did not have any goodwill impairments for the six-month periods ended June 30, 2024 or 2023. The total goodwill balances as of June 30, 2024 and December 31, 2023 were related to our cardiovascular segment.

Other intangible assets at June 30, 2024 and December 31, 2023 consisted of the following (in thousands):

	June 30, 2024
	Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount
Patents	$	30,163	$	(11,876)	$	18,287
Distribution agreements		3,250		(2,956)		294
License agreements		11,094		(8,759)		2,335
Trademarks		35,123		(22,343)		12,780
Customer lists		40,225		(34,694)		5,531
Total	$	119,855	$	(80,628)	$	39,227

	December 31, 2023
	Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount
Patents	$	28,877	$	(10,916)	$	17,961
Distribution agreements		3,250		(2,919)		331
License agreements		11,142		(8,327)		2,815
Trademarks		35,135		(20,804)		14,331
Customer lists		40,367		(33,921)		6,446
Total	$	118,771	$	(76,887)	$	41,884

Aggregate amortization expense for the three and six-month periods ended June 30, 2024 was $14.8 million and $29.4 million, respectively. Aggregate amortization expense for the three and six-month periods ended June 30, 2023 was $13.4 million and $25.7 million, respectively.

We evaluate long-lived assets, including amortizing intangible assets, for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. We perform the impairment analysis at the asset group for which the lowest level of identifiable cash flows is largely independent of the cash flows of other assets and liabilities. We determine the fair value of our amortizing assets based on estimated future cash flows discounted back to their present value using a discount rate that reflects the risk profiles of the underlying activities. We did not identify indicators of impairment for our intangible assets based on our consideration of triggering events for the six-month periods ended June 30, 2024 and 2023, respectively.

Estimated amortization expense for developed technology and other intangible assets for the next five years consisted of the following as of June 30, 2024 (in thousands):

	Estimated Amortization Expense
Remaining 2024	$	31,367
2025		60,826
2026		49,776
2027		46,440
2028		45,024