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Segment Reporting Disclosures (Tables)
 3 Months Ended
Mar. 31, 2024
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]  
Company's Segment Disclosures The following tables summarize the Company's segment disclosures.
Three Months Ended March 31, 2024
(dollars in thousands)InsuranceReinsuranceInvestingMarkel Ventures
Other insurance operations
Corporate
Consolidated
Earned premiums$1,874,461 $253,339 $— $— $(173)$— $2,127,627 
Net investment income— — 217,204 1,065 — — 218,269 
Net investment gains— — 902,281 — — — 902,281 
Products revenues— — — 600,840 — — 600,840 
Services and other revenues— — 20,846 538,701 58,091 — 617,638 
Total operating revenues1,874,461 253,339 1,140,331 1,140,606 57,918 — 4,466,655 
Losses and loss adjustment expenses:
Current accident year(1,201,555)(163,215)— — — — (1,364,770)
Prior accident years97,181 (3,398)— — (16,760)— 77,023 
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs(373,778)(60,809)— — — — (434,587)
Other underwriting expenses(288,999)(13,907)— — (1,259)— (304,165)
Products expenses— — — (523,247)— — (523,247)
Services and other expenses— — — (513,444)(23,394)— (536,838)
Amortization of acquired intangible assets
(44,285)(44,285)
Operating income$107,310 $12,010 $1,140,331 $103,915 $16,505 $(44,285)$1,335,786 
Interest expense(45,548)
Net foreign exchange gains51,500 
Income before income taxes$1,341,738 

Three Months Ended March 31, 2023
(dollars in thousands)InsuranceReinsuranceInvestingMarkel Ventures
Other insurance operations
Corporate
Consolidated
Earned premiums$1,710,924 $257,234 $— $— $(454)$— $1,967,704 
Net investment income— — 158,594 741 — — 159,335 
Net investment gains— — 372,563 — — — 372,563 
Products revenues— — — 577,926 — — 577,926 
Services and other revenues— — (2,380)526,013 42,228 — 565,861 
Total operating revenues1,710,924 257,234 528,777 1,104,680 41,774 — 3,643,389 
Losses and loss adjustment expenses:
Current accident year(1,077,546)(166,785)— — — — (1,244,331)
Prior accident years62,628 8,704 — — (15)— 71,317 
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs(360,354)(61,778)— — — — (422,132)
Other underwriting expenses(239,148)(13,141)— — (1,284)— (253,573)
Products expenses— — — (515,756)— — (515,756)
Services and other expenses— — — (496,746)16,127 — (480,619)
Amortization of acquired intangible assets
(44,399)(44,399)
Operating income$96,504 $24,234 $528,777 $92,178 $56,602 $(44,399)$753,896 
Interest expense(49,438)
Net foreign exchange losses(32,928)
Income before income taxes$671,530 
Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets The following table reconciles segment assets to the Company's consolidated balance sheets.
(dollars in thousands)March 31, 2024December 31, 2023
Segment assets:
Investing$31,699,863 $30,542,282 
Underwriting10,317,034 9,897,689 
Markel Ventures5,623,756 5,519,542 
Total segment assets47,640,653 45,959,513 
Other insurance operations
9,645,732 9,086,197 
Total assets$57,286,385 $55,045,710