Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments:
Fixed maturity securities (amortized cost of $20,915,245 and $18,715,483; allowance for expected credit losses of $36,751 and $37,466 at December 31, 2023 and 2022)	$ 20,178,308	$ 17,587,349
Investment funds	1,621,655	1,608,548
Real estate	1,249,874	1,340,622
Arbitrage trading account	938,049	944,230
Equity securities	1,090,347	1,185,894
Loans receivable (net of allowance for expected credit losses of $3,004 and $1,791 at December 31, 2023 and 2022)	201,271	193,002
Total investments	25,279,504	22,859,645
Cash and cash equivalents	1,363,195	1,449,346
Premiums and fees receivable (net of allowance for expected credit losses of $35,110 and $30,660 at December 31, 2023 and 2022)	3,109,334	2,779,244
Due from reinsurers (net of allowance for expected credit losses of $8,404 and $8,064 at December 31, 2023 and 2022)	3,534,527	3,187,730
Deferred policy acquisition costs	861,609	763,486
Prepaid reinsurance premiums	758,927	696,468
Trading account receivable from brokers and clearing organizations	303,614	233,863
Property, furniture and equipment	426,803	423,232
Goodwill	174,597	185,509
Accrued investment income	213,408	166,784
Current federal and foreign income taxes	1,318	39,123
Deferred federal and foreign income taxes	309,623	340,647
Other assets	865,556	736,022
Total assets	37,202,015	33,861,099
Liabilities:
Reserves for losses and loss expenses	18,739,652	17,011,223
Unearned premiums	5,922,326	5,297,654
Due to reinsurers	631,164	523,131
Trading account securities sold but not yet purchased	9,357	0
Current federal and foreign income taxes	47,525	34,350
Deferred federal and foreign income taxes	42,660	11,646
Senior notes and other debt	1,827,951	1,828,823
Subordinated debentures	1,009,090	1,008,371
Other liabilities	1,503,053	1,377,740
Total liabilities	29,732,778	27,092,938
Equity:
Preferred stock, par value $.10 per share: Authorized 5,000,000 shares; issued and outstanding - none	0	0
Common stock, par value $.20 per share: Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 177,825,150 and 183,411,907 shares, respectively	105,803	105,803
Additional paid-in capital	1,017,691	997,534
Retained earnings	11,040,908	10,161,005
Accumulated other comprehensive loss	(925,838)	(1,264,581)
Treasury stock, at cost, 272,469,871 and 264,468,528 shares, respectively	(3,783,133)	(3,251,429)
Total common stockholders’ equity	7,455,431	6,748,332
Noncontrolling interests	13,806	19,829
Total equity	7,469,237	6,768,161
Total liabilities and equity	$ 37,202,015	$ 33,861,099