Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 394,505	$ 449,127
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(276,760)	(189,394)
Depreciation and amortization	78,137	69,153
Noncontrolling interests	2,560	689
Investment funds	(51,907)	(60,387)
Stock incentive plans	31,883	27,033
Change in:
Arbitrage trading account	(2,835)	(4,777)
Premiums and fees receivable	(112,420)	(92,372)
Reinsurance accounts	(42,319)	(154,939)
Deferred policy acquisition costs	4,483	(51,795)
Income taxes	(15,451)	89,007
Reserves for losses and loss expenses	422,657	440,486
Unearned premiums	121,583	269,287
Other	(32,258)	(64,608)
Net cash from operating activities	521,858	726,510
CASH USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	3,081,619	1,074,630
Proceeds from sale of equity securities	137,062	123,187
Distributions from investment funds	265,371	5,630
Proceeds from maturities and prepayments of fixed maturity securities	2,860,678	2,189,365
Purchase of fixed maturity securities	(6,530,466)	(4,280,457)
Purchase of equity securities	(17,049)	(127,303)
Real estate purchased	(159,006)	(207,829)
Change in loans receivable	32,574	159,128
Net additions to property, furniture and equipment	(74,268)	(37,895)
Change in balances due to security brokers	39,978	102,981
Cash received in connection with business disposition	0	250,216
Payment for business purchased net of cash aquired	(70,570)	(53,524)
Net cash used in investing activities	(434,077)	(801,871)
CASH (USED IN) FROM FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(1,788)	(70,567)
Net proceeds from issuance of debt	0	386,848
Cash dividends to common stockholders	(93,371)	(30,654)
Purchase of common treasury shares	(28,378)	(99,870)
Other, net	(3,835)	(1,376)
Net cash (used in) from financing activities	(127,372)	184,381
Net impact on cash due to change in foreign exchange rates	18,303	413
Net change in cash and cash equivalents	(21,288)	109,433
Cash and cash equivalents at beginning of year	795,285	763,631
Cash and cash equivalents at end of period	$ 773,997	$ 873,064