CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $9,002,395 and $8,771,988)	$ 9,247,002	$ 8,957,859
Short-term investments available for sale, at fair value (amortized cost: $702,595 and $913,488)	704,495	915,841
Investment of funds received under securities lending, at fair value (amortized cost: $145,496 and $69,682)	145,224	69,660
Equity securities available for sale, at fair value (cost: $303,743 and $292,958)	320,434	310,194
Other investments available for sale, at fair value (cost: $270,342 and $252,590)	299,845	275,538
Investments accounted for using the fair value option	321,790	219,173
TALF investments, at fair value (amortized cost: $381,644 and $389,200)	399,341	402,449
Investment funds accounted for using the equity method	399,968	508,334
Total investments	11,838,099	11,659,048
Cash	411,001	362,740
Accrued investment income	71,083	74,837
Investment in joint venture (cost: $100,000)	105,982	105,698
Fixed maturities and short-term investments pledged under securities lending, at fair value	150,501	75,575
Premiums receivable	712,397	503,434
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,855,342	1,763,985
Prepaid reinsurance premiums	278,587	263,448
Deferred acquisition costs, net	310,616	277,861
Receivable for securities sold	733,931	56,145
Other assets	746,267	669,164
Total Assets	17,213,806	15,811,935
Liabilities
Reserve for losses and loss adjustment expenses	8,564,908	8,098,454
Unearned premiums	1,589,497	1,370,075
Reinsurance balances payable	154,860	132,452
Senior notes	300,000	300,000
Revolving credit agreement borrowings	100,000	100,000
TALF borrowings, at fair value (par: $318,596 and $326,219)	318,441	325,770
Securities lending payable	155,072	78,021
Payable for securities purchased	838,787	200,192
Other liabilities	750,972	693,968
Total Liabilities	12,772,537	11,298,932
Shareholders Equity
Non-cumulative preferred shares - Series A and B	325,000	325,000
Common shares ($0.0033 par, shares issued: 162,363,488 and 160,073,616)	541	534
Additional paid-in capital	142,001	110,325
Retained earnings	4,533,729	4,422,553
Accumulated other comprehensive income, net of deferred income tax	263,584	204,503
Common shares held in treasury, at cost (shares: 29,591,964 and 20,441,391)	(823,586)	(549,912)
Total Shareholders Equity	4,441,269	4,513,003
Total Liabilities and Shareholders Equity	$ 17,213,806	$ 15,811,935