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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Balances Of Assets Measured At Fair Value On A Recurring Basis
The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

September 30, 2024
(dollars in thousands)Level 1Level 2Level 3Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities$— $4,994,260 $— $4,994,260 
U.S. government-sponsored enterprises— 1,375,163 — 1,375,163 
Obligations of states, municipalities and political subdivisions— 3,910,352 — 3,910,352 
Foreign governments, agencies and supranationals
— 2,757,963 — 2,757,963 
Agency mortgage-backed securities
— 2,677,680 — 2,677,680 
Non-agency mortgage-backed securities
— 119,224 — 119,224 
Corporate and university bonds
— 233,206 — 233,206 
Total fixed maturity securities, available-for-sale— 16,067,848 — 16,067,848 
Equity securities:
Insurance, banks and other financial institutions4,657,047 — 1,333 4,658,380 
Industrial, consumer and all other6,932,918 — — 6,932,918 
Total equity securities11,589,965 — 1,333 11,591,298 
Short-term investments, available-for-sale2,214,054 141,684 — 2,355,738 
Total investments$13,804,019 $16,209,532 $1,333 $30,014,884 

December 31, 2023
(dollars in thousands)Level 1Level 2Level 3Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities$— $3,784,713 $— $3,784,713 
U.S. government-sponsored enterprises— 1,142,814 — 1,142,814 
Obligations of states, municipalities and political subdivisions— 4,029,305 — 4,029,305 
Foreign governments, agencies and supranationals
— 2,447,218 — 2,447,218 
Agency mortgage-backed securities
— 2,381,010 — 2,381,010 
Non-agency mortgage-backed securities
— 333,070 — 333,070 
Corporate and university bonds
— 254,602 — 254,602 
Total fixed maturity securities, available-for-sale— 14,372,732 — 14,372,732 
Equity securities:
Insurance, banks and other financial institutions3,694,375 — 994 3,695,369 
Industrial, consumer and all other5,882,502 — — 5,882,502 
Total equity securities9,576,877 — 994 9,577,871 
Short-term investments, available-for-sale2,402,099 169,283 — 2,571,382 
Total investments$11,978,976 $14,542,015 $994 $26,521,985