Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net earnings	$ 45,006	$ 657,652
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	89,559	86,449
Change in the fair value of equity securities	639,000	(316,630)
Net realized capital (gains) loss	(1,164)	(25,873)
Change in allowance for credit losses on available for sale securities	8,177	(2,218)
(Increase) decrease in reinsurance recoverables, net of reinsurance payable	101,474	(6,506)
(Increase) decrease in premium balances receivable	(168,584)	(293,135)
(Increase) decrease in ceded unearned premiums	(60,321)	(86,384)
(Increase) decrease in deferred acquisition costs	(59,893)	(56,715)
(Increase) decrease in funds held under reinsurance agreements	212,820	(28,367)
Increase (decrease) in unearned premiums	346,042	345,023
Increase (decrease) in loss and loss adjustment expenses	36,045	533,845
Change in unrealized foreign currency exchange rate losses (gains)	152,425	28,014
Other, net	(188,472)	104,027
Net adjustments	1,107,108	281,530
Net cash provided by operating activities	1,152,114	939,182
Cash flows from investing activities
Purchases of debt securities	(2,087,910)	(3,955,811)
Purchases of equity securities	(160,398)	(897,758)
Sales of debt securities	1,001,030	2,366,976
Maturities and redemptions of debt securities	942,984	1,136,960
Sales of equity securities	327,976	350,913
Net (purchases) sales of short-term investments	(481,774)	334,937
Net (purchases) sales and maturities of commercial mortgage loans	24,456	127,133
(Purchases) sales of property and equipment	(38,018)	(32,928)
Purchases of affiliates and subsidiaries, net of cash acquired	0	(57,881)
Other, net	11,100	26,340
Net cash used in investing activities	(460,554)	(601,119)
Cash flows from financing activities
Repayment of senior notes	(400,000)	0
Treasury stock acquisitions	(95,987)	(99,117)
Increase (decrease) in other debt	(108,393)	(105,512)
Other, net	(44,759)	(42,890)
Net cash used in financing activities	(649,139)	(247,519)
Effect of foreign exchange rate changes on cash	(28,868)	(10,527)
Net increase in cash	13,553	80,017
Cash at beginning of period	927,966	791,442
Cash at end of period	941,519	871,459
Supplemental disclosures of cash flow information
Interest paid	56,316	46,116
Income taxes paid	$ 157,336	$ 76,931