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Goodwill And Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Rollforward of Components Of Goodwill
The following table presents a rollforward of the components of goodwill by reportable segment.

(dollars in thousands)InsuranceReinsuranceMarkel Ventures
Other insurance operations(1)
Total
January 1, 2023$771,628 $122,745 $1,153,909 $590,556 $2,638,838 
Adjustments to preliminary purchase price allocation— — (16,752)— (16,752)
Foreign currency movements and other adjustments 1,195 — 497 971 2,663 
December 31, 2023 (2)
$772,823 $122,745 $1,137,654 $591,527 $2,624,749 
Acquisitions (note 3)
— — 114,589 — 114,589 
Foreign currency movements and other adjustments(3,247)— (434)210 (3,471)
December 31, 2024 (2)
$769,576 $122,745 $1,251,809 $591,737 $2,735,867 
(1)    Amounts included in other insurance operations reflect the Company's operations that are not included in a reportable segment and are primarily related to the Company's program services and insurance-linked securities operations.
(2)    As of December 31, 2024 and 2023, goodwill was net of accumulated impairment losses of $190.6 million, of which $171.9 million was in other insurance operations and $18.7 million was in Markel Ventures.
Rollforward of Components of Net Intangible Assets
The following table presents a rollforward of net intangible assets by reportable segment.

(dollars in thousands)
Underwriting (1)
Markel Ventures
Other insurance operations (2)
Total
January 1, 2023$362,322 $796,297 $588,845 $1,747,464 
Dispositions
— — (2,000)(2,000)
Amortization of acquired intangible assets
(37,076)(82,370)(61,168)(180,614)
Adjustments to preliminary purchase price allocation— 22,671 — 22,671 
Foreign currency movements and other adjustments98 119 946 1,163 
December 31, 2023$325,344 $736,717 $526,623 $1,588,684 
Acquisitions (note 3)
— 52,909 — 52,909 
Amortization of acquired intangible assets
(37,276)(81,317)(62,879)(181,472)
Foreign currency movements and other adjustments(117)154 (538)(501)
December 31, 2024$287,951 $708,463 $463,206 $1,459,620 
(1)    Amounts included in Underwriting reflect the intangible assets associated with the Company's underwriting segments, which are not allocated between the Insurance and Reinsurance segments.
(2)    Amounts included in other insurance operations reflect the Company's operations that are not included in a reportable segment and are primarily related to the Company's program services and insurance-linked securities operations.
Components of Intangible Assets
The following table presents the components of intangible assets.

December 31,
20242023
(dollars in thousands)Gross
Carrying
Amount 		Accumulated
Amortization 		Gross
Carrying
Amount		Accumulated
Amortization
Customer relationships$1,488,796 $(699,550)$1,450,503 $(600,724)
Investment management agreements464,000 (178,727)464,000 (149,560)
Broker and agent relationships
295,694 (182,139)297,693 (168,586)
Trade names305,381 (157,494)293,270 (138,040)
Technology113,187 (107,727)113,248 (100,781)
Insurance licenses72,333 — 72,333 — 
Other159,603 (113,737)169,681 (114,353)
Total$2,898,994 $(1,439,374)$2,860,728 $(1,272,044)