Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FROM (USED IN) OPERATING ACTIVITIES:
Net income to common stockholders	$ 228,477	$ 241,342
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(13,658)	(46,601)
Depreciation and amortization	46,873	42,267
Noncontrolling interests	676	151
Investment funds	(35,092)	(27,912)
Stock incentive plans	17,876	14,973
Change in:
Arbitrage trading account	(2,303)	(702)
Premiums and fees receivable	(174,811)	(133,227)
Reinsurance accounts	(100,545)	(60,595)
Deferred policy acquisition costs	(50,578)	(34,245)
Income taxes	8,269	48,929
Reserves for losses and loss expenses	239,621	285,204
Unearned premiums	276,815	174,108
Other	(109,302)	(170,809)
Net cash from operating activities	332,318	332,883
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	716,674	794,106
Proceeds from sale of equity securities	14,558	23,547
Distributions from investment funds	7,632	129,181
Proceeds from maturities and prepayments of fixed maturity securities	1,191,548	1,534,982
Purchase of fixed maturity securities	(2,238,683)	(2,168,400)
Purchase of equity securities	(126,414)	(8,543)
Real estate purchased	(114,434)	(84,826)
Change in loans receivable	130,267	62,601
Net additions to property, furniture and equipment	(21,224)	(23,504)
Change in balances due to security brokers	51,918	18,298
Payment for business purchased net of cash aquired	(41,213)	0
Net cash from (used in) investing activities	(429,371)	277,442
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(38,427)	(275,788)
Proceeds from Issuance of Debt	388,901	3,749
Cash dividends to common stockholders	(30,655)	(28,447)
Purchase of common treasury shares	(37,424)	(218,132)
Other, net	(926)	(91)
Net cash from (used in) financing activities	281,469	(518,709)
Net impact on cash due to change in foreign exchange rates	663	(9,689)
Net increase in cash and cash equivalents	185,079	81,927
Cash and cash equivalents at beginning of year	763,631	674,441
Cash and cash equivalents at end of period	$ 948,710	$ 756,368