Unaudited Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Operating Activities
Net income	$ 179,145		$ 256,476
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized gains	(22,367)		(59,504)
Net impairment losses recognized in earnings	2,971		2,246
Equity in net income or loss of investment funds accounted for using the equity method and other income or loss	9,559		23,052
Share-based compensation	14,175		11,543
Changes in:
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable	10,326		(22,182)
Unearned premiums, net of prepaid reinsurance premiums	205,210		200,006
Premiums receivable	(242,616)		(198,814)
Deferred acquisition costs, net	(41,988)		(45,159)
Reinsurance balances payable	5,428		17,365
Other liabilities	59,285		23,811
Other items	19,041		(3,181)
Net Cash Provided By Operating Activities	198,169		205,659
Investing Activities
Purchases of fixed maturity investments	(7,131,071)		(3,970,320)
Purchases of equity securities	(89,227)		(63,353)
Purchases of other investments	(304,454)		(250,442)
Proceeds from the sale of fixed maturity investments	7,014,281		3,796,638
Proceeds from the sale of equity securities	49,614		81,513
Proceeds from the sale of other investments	331,176		280,010
Proceeds from redemptions and maturities of fixed maturity investments	168,484		181,727
Net (purchases) sales of short-term investments	156,262		(221,444)
Change in investment of securities lending collateral	4,669		(41,019)
Purchase of business, net of cash acquired	(235,578)	[1]	0	[1]
Purchases of furniture, equipment and other assets	(5,382)		(3,742)
Net Cash Used For Investing Activities	(41,226)		(210,432)
Financing Activities
Purchases of common shares under share repurchase program	0		(40,964)
Proceeds from common shares issued, net	3,021		1,280
Change in securities lending collateral	(4,669)		41,019
Third party investment in non-redeemable noncontrolling interests	796,903	[2]	0	[2]
Third party investment in redeemable noncontrolling interests	186,893	[2]	0	[2]
Other	1,700		1,084
Preferred dividends paid	(5,484)		(5,484)
Net Cash Provided By (Used For) Financing Activities	978,364		(3,065)
Effects of exchange rate changes on foreign currency cash	241		(6,436)
Increase (decrease) in cash	1,135,548		(14,274)
Cash beginning of year	434,057		371,041
Cash end of period	$ 1,569,605		$ 356,767

[1] See Note 2.

[2] See Note 4.