Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 66,842	$ 397,431
Adjustments to reconcile net income to net cash from operating activities:
Net investment losses (gains)	99,289	(142,226)
Depreciation and amortization	64,065	51,289
Noncontrolling interests	1,288	1,610
Investment funds	16,975	(58,251)
Stock incentive plans	25,731	27,340
Change in:
Arbitrage trading account	(26,158)	(14,797)
Premiums and fees receivable	(204,203)	(223,771)
Reinsurance accounts	(118,849)	(112,681)
Deferred policy acquisition costs	(31,478)	(23,632)
Income taxes	9,387	2,759
Reserves for losses and loss expenses	525,785	350,981
Unearned premiums	259,237	254,010
Other	(108,060)	(107,416)
Net cash from operating activities	579,851	402,646
CASH FROM INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	3,194,333	1,320,079
Proceeds from sale of equity securities	67,122	39,103
Distributions from (contributions to) investment funds	67,234	(2,896)
Proceeds from maturities and prepayments of fixed maturity securities	1,859,392	1,490,772
Purchase of fixed maturity securities	(4,189,664)	(2,633,251)
Purchase of equity securities	(35,591)	(41,849)
Real estate purchased	(30,178)	(117,773)
Change in loans receivable	963	140
Net purchases of property, furniture and equipment	(23,006)	(10,804)
Change in balances due to security brokers	(24,382)	19,096
Other	85	0
Net cash from investing activities	886,308	62,617
CASH USED IN FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(1,160)	0
Net proceeds from issuance of debt	298,447	0
Cash dividends to common stockholders	(41,420)	(18,302)
Purchase of common treasury shares	(298,902)	0
Other, net	(4,140)	(5,548)
Net cash used in financing activities	(47,175)	(23,850)
Net impact on cash due to change in foreign exchange rates	(11,868)	(841)
Net change in cash and cash equivalents	1,407,116	440,572
Cash and cash equivalents at beginning of year	1,023,710	817,602
Cash and cash equivalents at end of period	$ 2,430,826	$ 1,258,174