Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FROM (USED IN) OPERATING ACTIVITIES:
Net income to common stockholders	$ 393,949	$ 538,173
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(100,505)	(234,180)
Depreciation and amortization	65,384	63,415
Noncontrolling interests	280	479
Investment funds	(50,838)	(150,502)
Stock incentive plans	24,052	21,549
Change in:
Arbitrage trading account	(4,157)	1,781
Premiums and fees receivable	(99,541)	(125,319)
Reinsurance accounts	(62,272)	12,967
Deferred policy acquisition costs	(40,216)	(44,087)
Income taxes	80,587	11,092
Reserves for losses and loss expenses	362,854	277,542
Unearned premiums	198,534	345,521
Other	(147,776)	(143,645)
Net cash from operating activities	620,335	574,786
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	765,764	546,970
Proceeds from sale of equity securities	23,778	109,928
Distributions from investment funds	198,489	285,233
Proceeds from maturities and prepayments of fixed maturity securities	2,727,635	1,887,252
Purchase of fixed maturity securities	(3,387,648)	(3,098,477)
Purchase of equity securities	(37,754)	(28,606)
Additions to real estate	(150,940)	(253,007)
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold	0	343,723
Change in loans receivable	35,739	320
Net additions to property, furniture and equipment	(40,262)	(30,797)
Change in balances due to security brokers	43,429	68,411
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	15,612
Payment for business purchased net of cash aquired	(7,156)	(65,423)
Net cash from (used in) investing activities	171,074	(218,861)
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(279,204)	(1,829)
Proceeds from Issuance of Debt	1,891	431,409
Cash dividends to common stockholders	(43,239)	(40,782)
Purchase of common treasury shares	(223,652)	(236,703)
Other, net	(3,345)	913
Net cash from (used in) financing activities	(547,549)	153,008
Net impact on cash due to change in foreign exchange rates	(38,367)	(6,386)
Net change in cash and cash equivalents	205,493	502,547
Cash and cash equivalents at beginning of year	674,441	839,738
Cash and cash equivalents at end of period	$ 879,934	$ 1,342,285