Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 590,638	$ 229,525
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(366,265)	(34,839)
Depreciation and amortization	24,631	33,543
Noncontrolling interests	2,392	2,191
Investment funds	(52,012)	(38,935)
Stock incentive plans	11,438	11,817
Change in:
Arbitrage trading account	(7,215)	(16,108)
Premiums and fees receivable	(69,704)	(96,290)
Reinsurance accounts	(2,643)	(105,589)
Deferred policy acquisition costs	(39,220)	(38,577)
Income taxes	123,763	47,372
Reserves for losses and loss expenses	316,065	303,305
Unearned premiums	167,522	219,920
Other	(221,708)	(206,345)
Net cash from operating activities	477,682	310,990
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	408,221	1,115,114
Proceeds from sale of equity securities	9,227	57,457
(Contributions) distributions from investment funds	(13,423)	36,236
Proceeds from maturities and prepayments of fixed maturity securities	1,440,457	1,623,357
Purchase of fixed maturity securities	(2,200,214)	(4,118,161)
Purchase of equity securities	(100,356)	(69,181)
Real estate sold	28,141	9,787
Change in loans receivable	332	9,256
Net purchases of property, furniture and equipment	(9,114)	(10,872)
Change in balances due to security brokers	98,058	151,776
Cash received in connection with business disposition	906,789	0
Payment for business purchased net of cash acquired	(49,572)	0
Other	17	0
Net cash from (used in) investing activities	518,563	(1,195,231)
CASH (USED IN) FROM FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(426,503)	(110,000)
Net payments for stock options exercised	(327)	(525)
Net proceeds from issuance of debt	1,186	691,213
Cash dividends to common stockholders	(22,983)	(21,285)
Purchase of common treasury shares	0	(29,683)
Other, net	(2,703)	(1,503)
Net cash (used in) from financing activities	(451,330)	528,217
Net impact on cash due to change in foreign exchange rates	1,083	(1,431)
Net change in cash and cash equivalents	545,998	(357,455)
Cash and cash equivalents at beginning of period	1,568,843	2,372,366
Cash and cash equivalents at end of period	$ 2,114,841	$ 2,014,911