Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FROM (USED IN) OPERATING ACTIVITIES:
Net income to common stockholders	$ 449,127	$ 393,949
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(189,394)	(100,505)
Depreciation and amortization	69,153	65,384
Noncontrolling interests	689	280
Investment funds	(60,387)	(50,838)
Stock incentive plans	27,033	24,052
Change in:
Arbitrage trading account	(4,777)	(4,157)
Premiums and fees receivable	(92,372)	(99,541)
Reinsurance accounts	(154,939)	(62,272)
Deferred policy acquisition costs	(51,795)	(40,216)
Income taxes	89,007	80,587
Reserves for losses and loss expenses	440,486	362,854
Unearned premiums	269,287	198,534
Other	(64,608)	(147,776)
Net cash from operating activities	726,510	620,335
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	1,074,630	765,764
Proceeds from sale of equity securities	123,187	23,778
Distributions from investment funds	5,630	198,489
Proceeds from maturities and prepayments of fixed maturity securities	2,189,365	2,727,635
Purchase of fixed maturity securities	(4,280,457)	(3,387,648)
Purchase of equity securities	(127,303)	(37,754)
Real estate purchased	(207,829)	(150,940)
Change in loans receivable	159,128	35,739
Net additions to property, furniture and equipment	(37,895)	(40,262)
Change in balances due to security brokers	102,981	43,429
Proceeds from Divestiture of Businesses, Net of Cash Divested	250,216	0
Payment for business purchased net of cash aquired	(53,524)	(7,156)
Net cash from (used in) investing activities	(801,871)	171,074
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(70,567)	(279,204)
Proceeds from Issuance of Debt	386,848	1,891
Cash dividends to common stockholders	(30,654)	(43,239)
Purchase of common treasury shares	(99,870)	(223,652)
Other, net	(1,376)	(3,345)
Net cash from (used in) financing activities	184,381	(547,549)
Net impact on cash due to change in foreign exchange rates	413	(38,367)
Net change in cash and cash equivalents	109,433	205,493
Cash and cash equivalents at beginning of year	763,631	674,441
Cash and cash equivalents at end of period	$ 873,064	$ 879,934